CN105779821A - High-strength and high-toughness damage-tolerance structural titanium alloy - Google Patents
High-strength and high-toughness damage-tolerance structural titanium alloy Download PDFInfo
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Abstract
The invention discloses high-strength and high-toughness damage-tolerance structural titanium alloy. The high-strength and high-toughness damage-tolerance structural titanium alloy is prepared from, by mass, 4%-6% of Al, 3%-4% of Mo, 3%-4% of V, 2%-4% of Cr and Fe, 1%-2% of Nb, 0-2% of Zr and the balance Ti and other inevitable impurities, wherein the percentage content of Mo is equal to that of V. The structural titanium alloy contains a large quantity of the alpha stable element Al and a proper quantity of beta eutectoid elements Cr and Fe, a multi-element reinforcement way is adopted by the structural titanium alloy, and the proportion of the alpha phase and the beta phase in the structural titanium alloy are controlled by controlling the content of the alpha stable element Al and the content of the beta stable elements in the alloy, so that the alloy is made to be in a double-phase alloy sequence; after heat treatment is conducted on the structural titanium alloy, the tensile strength Rm is equal to or higher than 1200 MPa, the breaking tenacity KIC is equal to or higher than 65 MPa.m<1/2>, the extension rate Da/dN of fatigue cracks is small than or equal to 10<-5> mm/cycle.
Description
Technical field
The invention belongs to high-strength titanium alloy technical field, being specifically related to one, to can be applicable to Aero-Space high-strength
High-strength and high ductility damage tolerance type structural titanium alloy in structure.
Background technology
Metal material has excellent comprehensive mechanical property and physical and chemical performance concurrently, thus becomes main flow
Structural material.Intensity, plasticity and toughness are not only the important indicator characterizing metal material mechanics performance,
Also the design criteria of high-performance metal materials is become.Along with damage tolerance design criterion is led in Aero-Space
The improving constantly of level of application in territory, the damage tolerance performance of material (fatigue crack growth rate and disconnected
Split toughness) it is increasingly becoming the important indicator examining material can meet structure design.
Along with development and the utilization of damage tolerance design criterion, advanced titanium alloys material is the most progressively to having
The damage tolerance Type Titanium Alloy direction of high-fracture toughness and low crack growth rate is developed.At present, abroad
Developed country is in new lesions tolerance limit Type Titanium Alloy material development and the application on Advanced Aircraft
Aspect is walked in prostatitis, particularly as the Ti-6Al-4V ELI titanium alloy of middle intensity and high intensity
Ti-6-22-22S titanium alloys etc., have been successfully applied to U.S. F-22, F-35 and C-17 etc. new
In generation aircraft, greatly increase service life and the fighting capacity of aircraft.
Along with the development of airplane design theory, the damage tolerance design thinking of titanium alloy structure is in China also
Start to be paid close attention to.Since " 15 ", present situation of basing on our country, research worker successively autonomous innovation is opened
Having sent out TC4-DT and TC21 equivalent damage tolerance limit Type Titanium Alloy, both alloys are 1000～1100MPa
Moderate strength level under there is higher fracture toughness (KIC≥70MPa·m1/2) and relatively low crackle
Spreading rate.Along with the design of high loss of weight is required more and more higher with application by aircraft, aircraft is to having height
The damage tolerance type titanium alloy material application demand of intensity is more and more urgent.In order to meet higher reality
Border application demand, high intensity damage tolerance Type Titanium Alloy is to realize high structure efficiency important materials technology,
One of striving direction of Ye Shi various countries Ti alloy with high performance research and development.
Summary of the invention
The technical problem to be solved is for above-mentioned deficiency of the prior art, it is provided that one
Plant high-strength and high ductility damage tolerance type structural titanium alloy, containing the stable unit of more α in this structural titanium alloy
Element Al and appropriate β eutectoid type element Cr, Fe, it uses multielement enhanced mode, by right
In alloy, the control of α stable element and beta stable element content controls the ratio of wherein α phase and β phase,
Alloy is made to be in two-phase alloys sequence, this structural titanium alloy tensile strength after heat treatment
Rm>=1200Mpa, fracture toughness KIC≥65MPa·m1/2, fatigue crack growth rate
Da/dN≤10-5mm/cycle。
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of high-strength and high ductility damage is held
Limit type structural titanium alloy, it is characterised in that be grouped into by the one-tenth of following weight/mass percentage composition: Al
4%～6%, Mo 3%～4%, V 3%～4%, Cr+Fe 2%～4%, Nb 1%～2%, Zr 0～2%,
Surplus is Ti and other inevitable impurity, wherein the weight/mass percentage composition of Mo and the quality of V
Percentage composition is equal, and the weight/mass percentage composition of Cr is not less than 1.5%, and the weight/mass percentage composition of Fe is more than
0 and less than or equal to 1.5%, described high-strength and high ductility damage tolerance type structural titanium alloy after heat treatment anti-
Tensile strength Rm>=1200Mpa, fracture toughness KIC≥65MPa·m1/2, fatigue crack growth rate
Da/dN≤10-5mm/cycle。
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following matter
The one-tenth of amount percentage composition is grouped into: Al 5%～6%, Mo 3%～3.5%, V 3%～3.5%, Cr+Fe
3%～4%, Nb 1%～2%, surplus is Ti and other inevitable impurity.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following matter
The one-tenth of amount percentage composition is grouped into: Al 6%, Mo 3%, V 3%, Cr 3%, Fe 0.5%, Nb 2%,
Surplus is Ti and other inevitable impurity.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that described high-strength
In high-ductility damage tolerance type structural titanium alloy, the weight/mass percentage composition of Zr is 1%～2%.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following matter
The one-tenth of amount percentage composition is grouped into: Al 5%, Mo 3.5%, V 3.5%, Cr 2%, Fe 1%, Nb 1%,
Zr 2%, surplus is Ti and other inevitable impurity.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following matter
The one-tenth of amount percentage composition is grouped into: Al 4%, Mo 3%, V 3%, Cr 2%, Fe 1%, Nb 1%,
Zr 1%, surplus is Ti and other inevitable impurity.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following matter
The one-tenth of amount percentage composition is grouped into: Al 6%, Mo 4%, V 4%, Cr 3%, Fe 1%, Nb 1%,
Zr 2%, surplus is Ti and other inevitable impurity.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that described Fe
Weight/mass percentage composition more than or equal to 0.5% and less than or equal to 1.5%.
Above-mentioned a kind of high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that at described heat
The technical process of reason is: be 810 by the high-strength and high ductility damage tolerance type structural titanium alloy of preparation in temperature
DEG C～840 DEG C under conditions of be incubated 1h～2h, then air cooling is to room temperature, is then 580 DEG C～640 in temperature
It is incubated 4h～8h under conditions of DEG C, then air cooling is to room temperature.
The present invention compared with prior art has the advantage that
1, containing more α stable element in high-strength and high ductility damage tolerance type structural titanium alloy of the present invention
The addition of Al, Al expands the alpha phase zone in alloy, the beneficially analysis of disperse α phase during Ageing Treatment
Go out, thus the strengthening of beneficially alloy, when still preventing under cryogenic, metastable β phase decomposition is ω
Alloy fragility is caused to increase mutually.
2, high-strength and high ductility damage tolerance type structural titanium alloy of the present invention adds appropriate β eutectoid type
Element Cr and Fe, the ability of this kind of elemental stable β phase is relatively strong, can play stable β phase and solid solution is strong
Change effect, but in order to prevent brittle intermetallic thing, the present invention limits Cr and Fe in alloy
Weight/mass percentage composition sum be not more than 4%.
3, high-strength and high ductility damage tolerance type structural titanium alloy of the present invention can add suitable neutral element
β crystal grain in suppression alloy can be grown up and be played a role by the addition of element Zr, Zr, but too high
Zr content low-alloyed fracture toughness can drop, therefore in alloy, the weight/mass percentage composition of Zr is not more than
2%.
4, the present invention takes multielement enhanced mode, by stable to α stable element in alloy and β
The control of constituent content controls wherein α phase and the ratio of β phase, makes alloy be in two-phase alloys sequence,
This feature i.e. ensure that alloy has higher intensity, also ensures that alloy has good plasticity and breaks
Splitting toughness, high-strength and high ductility damage tolerance type structural titanium alloy of the present invention is strong by tension after appropriate heat treatment
Degree Rm>=1200Mpa, fracture toughness KIC>=65MPa m1/2, fatigue crack growth rate
Da/dN≤10-5Mm/cycle, has excellent high-strength, high-ductility damage tolerance performance, this high-strength and high ductility
Damage tolerance type structural titanium alloy may be used to the production application various forging in high strength structure part, has
It is widely applied prospect.
5, the preparation method of high-strength and high ductility damage tolerance type structural titanium alloy of the present invention is simple, according to often
The titanium alloys Preparation Method of rule can be prepared by.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the micro-organization chart of the embodiment of the present invention 1 high-strength and high ductility damage tolerance type structural titanium alloy.
Fig. 2 is the micro-organization chart of the embodiment of the present invention 2 high-strength and high ductility damage tolerance type structural titanium alloy.
Fig. 3 is the micro-organization chart of the embodiment of the present invention 3 high-strength and high ductility damage tolerance type structural titanium alloy.
Fig. 4 is the micro-organization chart of the embodiment of the present invention 4 high-strength and high ductility damage tolerance type structural titanium alloy.
Detailed description of the invention
Embodiment 1
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 5%, Mo 3.5%, V 3.5%, Cr 2%, Fe 1%, Nb 1%, Zr 2%, surplus
For Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1080 DEG C, adding of the first fire time high temperature β phase region forging
Hot temperature is 970 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 920 DEG C, two fire
The passage upsetting pull amount of high temperature β phase region forging is 50%, adding of two fire time (alpha+beta) two-phase section forgings
Hot temperature is 830 DEG C, and passage upsetting pull amount is 40%, total deformation >=60%, described heat treatment
Technical process is: being incubated 1h under conditions of temperature is 810 DEG C, then air cooling is to room temperature, then exists
Temperature is incubated 6h under conditions of being 600 DEG C, then air cooling is to room temperature.
From figure 1 it appears that the high-strength and high ductility damage tolerance type structure titanium after the present embodiment heat treatment
The microstructure of alloy is by isometry primary alpha phase and βTurnTissue composition, the isometry primary α of certain content
Ensure that titanium alloy plasticity under high-strength state, β mutuallyTurnThe lamella secondaryαphase organized the formation of makes titanium
Alloy has preferable ageing strengthening effect and fracture toughness.High-strength and high ductility after the present embodiment heat treatment
Damage tolerance type structural titanium alloy bar tensile strength R at ambient temperaturem=1280Mpa, fracture
Toughness KIC=68MPa m1/2, fatigue crack growth rate Da/dN≤10-5Mm/cycle, this high-strength height
Tough damage tolerance type structural titanium alloy bar has excellent high-strength, high-ductility damage tolerance performance, available
With the production application various forging in high strength structure part.
Embodiment 2
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 4%, Mo 3%, V 3%, Cr 2%, Fe 1%, Nb 1%, Zr 1%, surplus is
Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1150 DEG C, adding of the first fire time high temperature β phase region forging
Hot temperature is 1000 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 950 DEG C, two fire
The passage upsetting pull amount of high temperature β phase region forging is 50%, adding of two fire time (alpha+beta) two-phase section forgings
Hot temperature is 860 DEG C, and passage upsetting pull amount is 50%, total deformation >=60%, described heat treatment
Technical process is: being incubated 1h under conditions of temperature is 820 DEG C, then air cooling is to room temperature, then exists
Temperature is incubated 8h under conditions of being 620 DEG C, then air cooling is to room temperature.
From figure 2 it can be seen that the high-strength and high ductility damage tolerance type structure titanium after the present embodiment heat treatment
The microstructure of alloy is by isometry primary alpha phase and βTurnTissue composition, the isometry primary α of certain content
Ensure that titanium alloy plasticity under high-strength state, β mutuallyTurnThe tiny needle-like secondaryαphase organized the formation of
Titanium alloy is made to have preferable ageing strengthening effect and fracture toughness, high-strength after the present embodiment heat treatment
High-ductility damage tolerance type structural titanium alloy bar tensile strength R at ambient temperaturem=1300Mpa,
Fracture toughness KIC=65MPa m1/2, fatigue crack growth rate Da/dN≤10-5Mm/cycle, this height
Strong high-ductility damage tolerance type structural titanium alloy bar has excellent high-strength, high-ductility damage tolerance performance,
May be used to the production application various forging in high strength structure part.
Embodiment 3
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 6%, Mo 4%, V 4%, Cr 3%, Fe 1%, Nb 1%, Zr 2%, surplus is
Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1100 DEG C, adding of the first fire time high temperature β phase region forging
Hot temperature is 970 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 940 DEG C, two fire
The passage upsetting pull amount of high temperature β phase region forging is 60%, adding of two fire time (alpha+beta) two-phase section forgings
Hot temperature is 830 DEG C, and passage upsetting pull amount is 50%, total deformation >=60%, described heat treatment
Technical process is: being incubated 1h under conditions of temperature is 830 DEG C, then air cooling is to room temperature, then exists
Temperature is incubated 6h under conditions of being 580 DEG C, then air cooling is to room temperature.
From figure 3, it can be seen that the high-strength and high ductility damage tolerance type structure titanium after the present embodiment heat treatment
The microstructure of alloy is by isometry primary alpha phase, a small amount of long rod-like primary α phase and βTurnTissue composition,
The isometry primary alpha phase of certain content ensure that titanium alloy plasticity under high-strength state, rod-like primary α
The toughness of titanium alloy can be improved, β by changing crack propagation pathTurnThe sheet level organized the formation of
Raw α phase makes titanium alloy have preferable ageing strengthening effect and fracture toughness, after the present embodiment heat treatment
High-strength and high ductility damage tolerance type structural titanium alloy bar tensile strength at ambient temperature
Rm=1265Mpa, fracture toughness KIC=68.5MPa m1/2, fatigue crack growth rate
Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has excellent
High-strength, high-ductility damage tolerance performance, may be used to the production application various forging in high strength structure part.
Embodiment 4
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 6%, Mo 3%, V 3%, Cr 3%, Fe 0.5%, Nb 2%, surplus be Ti and its
His inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy and pure iron nail are by design
It is pressed into electrode after composition mixing, uses vacuum consumable arc-melting stove by three systems of described electrode melting
For obtaining alloy cast ingot, alloy cast ingot is after surface strips off the skin and cuts rising head, at hydraulic press or forging hammer etc. certainly
By carrying out cogging forging, two fire time high temperature β phase region forgings and two fire time (alpha+betas) two on forging equipment
Phase region forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy bar, described
The heating-up temperature of cogging forging is 1050 DEG C, and the heating-up temperature of the first fire time high temperature β phase region forging is
950 DEG C, the heating-up temperature of the second fire time high temperature β phase region forging is 900 DEG C, two fire time high temperature β phase regions
The passage upsetting pull amount of forging is 50%, and the heating-up temperature of two fire time (alpha+beta) two-phase section forgings is
840 DEG C, passage upsetting pull amount is 30%, total deformation >=60%, and described process of thermal treatment process is:
Being incubated 1h under conditions of temperature is 830 DEG C, then air cooling is to room temperature, is then 640 DEG C in temperature
Under conditions of be incubated 6h, then air cooling is to room temperature.
Figure 4, it is seen that the high-strength and high ductility damage tolerance type structure titanium after the present embodiment heat treatment
The microstructure of alloy is by isometry primary alpha phase, long rod-like primary α phase and βTurnTissue composition, isometry
Primary alpha phase makes titanium alloy have good stretching plastic, rod-like primary α and tiny needle-like secondaryαphase
Titanium alloy is made to have preferable ageing strengthening, toughening effect, the high-strength and high ductility after the present embodiment heat treatment
Damage tolerance type structural titanium alloy bar tensile strength R at ambient temperaturem=1255Mpa, fracture
Toughness KIC=69.5MPa m1/2, fatigue crack growth rate Da/dN≤10-5Mm/cycle, this is high-strength
High-ductility damage tolerance type structural titanium alloy bar has excellent high-strength, high-ductility damage tolerance performance, can
In order to the production application various forging in high strength structure part.
Embodiment 5
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 5%, Mo 3.5%, V 3.5%, Cr 1.5%, Fe 0.5%, Nb 1.5%, Zr 1%,
Surplus is Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1050 DEG C, adding of the first fire time high temperature β phase region forging
Hot temperature is 950 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 920 DEG C, two fire
The passage upsetting pull amount of high temperature β phase region forging is 60%, adding of two fire time (alpha+beta) two-phase section forgings
Hot temperature is 830 DEG C, and passage upsetting pull amount is 30%, total deformation >=60%, described heat treatment
Technical process is: being incubated 2h under conditions of temperature is 840 DEG C, then air cooling is to room temperature, then exists
Temperature is incubated 6h under conditions of being 640 DEG C, then air cooling is to room temperature.
High-strength and high ductility damage tolerance type structural titanium alloy bar after the present embodiment heat treatment is at room temperature bar
Tensile strength R under partm=1200Mpa, fracture toughness KIC=67.16MPa m1/2, fatigue crack expands
Exhibition speed Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has
Excellent high-strength, high-ductility damage tolerance performance, may be used to various in high strength structure part of production application
Forging.
Embodiment 6
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 5%, Mo 3.2%, V3.2%, Cr 2%, Fe 1%, Nb 2%, Zr 1.5%, surplus
For Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1100 DEG C, adding of the first fire time high temperature β phase region forging
Hot temperature is 970 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 950 DEG C, two fire
The passage upsetting pull amount of high temperature β phase region forging is 50%, adding of two fire time (alpha+beta) two-phase section forgings
Hot temperature is 830 DEG C, and passage upsetting pull amount is 40%, total deformation >=70%, described heat treatment
Technical process is: being incubated 1h under conditions of temperature is 840 DEG C, then air cooling is to room temperature, then exists
Temperature is incubated 6h under conditions of being 620 DEG C, then air cooling is to room temperature.
High-strength and high ductility damage tolerance type structural titanium alloy bar after the present embodiment heat treatment is at room temperature bar
Tensile strength R under partm=1270Mpa, fracture toughness KIC=68.05MPa m1/2, fatigue crack expands
Exhibition speed Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has
Excellent high-strength, high-ductility damage tolerance performance, may be used to various in high strength structure part of production application
Forging.
Embodiment 7
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 6%, Mo 3.5%, V3.5%, Cr 2%, Fe 1.5%, Nb 1%, Zr 1%, surplus
For Ti and other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy, sponge zirconium and pure iron
Follow closely and be pressed into electrode by after design composition mixing, use vacuum consumable arc-melting stove to be melted by described electrode
Refine and prepare alloy cast ingot three times, alloy cast ingot after surface strips off the skin and cuts rising head, at hydraulic press or
Cogging forging, two fire time high temperature β phase region forging and two fire are carried out on the flat-die forging equipment such as forging hammer
(alpha+beta) two-phase section forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy
Bar, the heating-up temperature of described cogging forging is 1080 DEG C, the temperature of the first fire time high temperature β phase region forging
Degree is 960 DEG C, and the heating-up temperature of the second fire time high temperature β phase region forging is 920 DEG C, two fire time high temperature β
The passage upsetting pull amount of phase region forging is 40%, the heating-up temperature of two fire time (alpha+beta) two-phase section forgings
Being 850 DEG C, passage upsetting pull amount is 30%, total deformation >=60%, described process of thermal treatment mistake
Cheng Wei: being incubated 1h under conditions of temperature is 840 DEG C, then air cooling is to room temperature, then in temperature is
It is incubated 4h under conditions of 620 DEG C, then air cooling is to room temperature.
High-strength and high ductility damage tolerance type structural titanium alloy bar after the present embodiment heat treatment is at room temperature bar
Tensile strength R under partm=1270Mpa, fracture toughness KIC=68.38MPa m1/2, fatigue crack expands
Exhibition speed Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has
Excellent high-strength, high-ductility damage tolerance performance, may be used to various in high strength structure part of production application
Forging.
Embodiment 8
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 6%, Mo 3.5%, V3.5%, Cr 1.5%, Fe 1.5%, Nb 2%, surplus is Ti
With other inevitable impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy and pure iron nail are by design
It is pressed into electrode after composition mixing, uses vacuum consumable arc-melting stove by three systems of described electrode melting
For obtaining alloy cast ingot, alloy cast ingot is after surface strips off the skin and cuts rising head, at hydraulic press or forging hammer etc. certainly
By carrying out cogging forging, two fire time high temperature β phase region forgings and two fire time (alpha+betas) two on forging equipment
Phase region forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy bar, described
The heating-up temperature of cogging forging is 1050 DEG C, and the heating-up temperature of the first fire time high temperature β phase region forging is
950 DEG C, the heating-up temperature of the second fire time high temperature β phase region forging is 920 DEG C, two fire time high temperature β phase regions
The passage upsetting pull amount of forging is 50%, and the heating-up temperature of two fire time (alpha+beta) two-phase section forgings is
850 DEG C, passage upsetting pull amount is 40%, total deformation >=70%, and described process of thermal treatment process is:
Being incubated 1h under conditions of temperature is 840 DEG C, then air cooling is to room temperature, is then 600 DEG C in temperature
Under conditions of be incubated 4h, then air cooling is to room temperature.
High-strength and high ductility damage tolerance type structural titanium alloy bar after the present embodiment heat treatment is at room temperature bar
Tensile strength R under partm=1300Mpa, fracture toughness KIC=67.12MPa m1/2, fatigue crack expands
Exhibition speed Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has
Excellent high-strength, high-ductility damage tolerance performance, may be used to various in high strength structure part of production application
Forging.
Embodiment 9
The present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is by the composition of following weight/mass percentage composition
Composition: Al 5%, Mo 3%, V3%, Cr 3%, Fe 1%, Nb 1%, surplus be Ti and other
Inevitably impurity.
The preparation method of the present embodiment high-strength and high ductility damage tolerance type structural titanium alloy is: by raw material zero level
Titanium sponge, aluminium molybdenum alloys, aluminum-vanadium alloy, electrolysis chromium, aluminium shot, aluminum niobium alloy and pure iron nail are by design
It is pressed into electrode after composition mixing, uses vacuum consumable arc-melting stove by three systems of described electrode melting
For obtaining alloy cast ingot, alloy cast ingot is after surface strips off the skin and cuts rising head, at hydraulic press or forging hammer etc. certainly
By carrying out cogging forging, two fire time high temperature β phase region forgings and two fire time (alpha+betas) two on forging equipment
Phase region forges, more after heat treatment obtains high-strength and high ductility damage tolerance type structural titanium alloy bar, described
The heating-up temperature of cogging forging is 1090 DEG C, and the heating-up temperature of the first fire time high temperature β phase region forging is
980 DEG C, the heating-up temperature of the second fire time high temperature β phase region forging is 930 DEG C, two fire time high temperature β phase regions
The passage upsetting pull amount of forging is 50%, and the heating-up temperature of two fire time (alpha+beta) two-phase section forgings is
850 DEG C, passage upsetting pull amount is 50%, total deformation >=70%, and described process of thermal treatment process is:
Being incubated 1h under conditions of temperature is 820 DEG C, then air cooling is to room temperature, is then 640 DEG C in temperature
Under conditions of be incubated 4h, then air cooling is to room temperature.
High-strength and high ductility damage tolerance type structural titanium alloy bar after the present embodiment heat treatment is at room temperature bar
Tensile strength R under partm=1240Mpa, fracture toughness KIC=69.15MPa m1/2, fatigue crack expands
Exhibition speed Da/dN≤10-5Mm/cycle, this high-strength and high ductility damage tolerance type structural titanium alloy bar has
Excellent high-strength, high-ductility damage tolerance performance, may be used to various in high strength structure part of production application
Forging.
The above, be only presently preferred embodiments of the present invention, not impose any restrictions the present invention, every
Any simple modification, change and equivalent structure above example made according to the technology of the present invention essence
Change, all still falls within the protection domain of technical solution of the present invention.
Claims (9)
1. a high-strength and high ductility damage tolerance type structural titanium alloy, it is characterised in that by following quality hundred
The one-tenth dividing content is grouped into: Al 4%～6%, Mo 3%～4%, V 3%～4%, Cr+Fe 2%～4%,
Nb 1%～2%, Zr 0～2%, surplus is Ti and other inevitable impurity, the wherein matter of Mo
Amount percentage composition is equal with the weight/mass percentage composition of V, and the weight/mass percentage composition of Cr is not less than 1.5%,
The weight/mass percentage composition of Fe is more than 0 and less than or equal to 1.5%, and described high-strength and high ductility damage tolerance type is tied
Structure titanium alloy tensile strength R after heat treatmentm>=1200Mpa, fracture toughness KIC≥65MPa·m1/2,
Fatigue crack growth rate Da/dN≤10-5mm/cycle。
2., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 1, it is special
Levy and be, the one-tenth of following weight/mass percentage composition be grouped into: Al 5%～6%, Mo 3%～3.5%, V
3%～3.5%, Cr+Fe 3%～4%, Nb 1%～2%, surplus is Ti and other inevitable impurity.
3., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 2, it is special
Levy and be, the one-tenth of following weight/mass percentage composition be grouped into: Al 6%, Mo 3%, V 3%, Cr 3%,
Fe 0.5%, Nb 2%, surplus is Ti and other inevitable impurity.
4., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 1, it is special
Levying and be, in described high-strength and high ductility damage tolerance type structural titanium alloy, the weight/mass percentage composition of Zr is
1%～2%.
5., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 4, it is special
Levy and be, the one-tenth of following weight/mass percentage composition be grouped into: Al 5%, Mo 3.5%, V 3.5%,
Cr 2%, Fe 1%, Nb 1%, Zr 2%, surplus is Ti and other inevitable impurity.
6., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 4, it is special
Levy and be, the one-tenth of following weight/mass percentage composition be grouped into: Al 4%, Mo 3%, V 3%, Cr 2%,
Fe 1%, Nb 1%, Zr 1%, surplus is Ti and other inevitable impurity.
7., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 4, it is special
Levy and be, the one-tenth of following weight/mass percentage composition be grouped into: Al 6%, Mo 4%, V 4%, Cr 3%,
Fe 1%, Nb 1%, Zr 2%, surplus is Ti and other inevitable impurity.
8., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 1, it is special
Levying and be, the weight/mass percentage composition of described Fe is more than or equal to 0.5% and less than or equal to 1.5%.
9., according to a kind of high-strength and high ductility damage tolerance type structural titanium alloy described in claim 1, it is special
Levying and be, described process of thermal treatment process is: by the high-strength and high ductility damage tolerance type structure titanium of preparation
Alloy is incubated 1h～2h under conditions of temperature is 810 DEG C～840 DEG C, and then air cooling is to room temperature, then
Under conditions of temperature is 580 DEG C～640 DEG C, it is incubated 4h～8h, then air cooling is to room temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119606A (en) * | 2016-08-26 | 2016-11-16 | 西部超导材料科技股份有限公司 | A kind of WSTi45561 superhigh intensity titanium alloy and preparation method thereof |
| CN106148761A (en) * | 2016-08-31 | 2016-11-23 | 中国船舶重工集团公司第七二五研究所 | A kind of anti-corrosion solderable titanium alloy of high intensity high impact toughness and preparation method thereof |
| CN106435265A (en) * | 2016-09-14 | 2017-02-22 | 沈阳泰恒通用技术有限公司 | High-strength Ti alloy for springs for rail transit |
| CN109971999A (en) * | 2019-04-28 | 2019-07-05 | 西北有色金属研究院 | A kind of 1500MPa grades of superelevation be strong, in tough titanium alloy |
| CN113355559A (en) * | 2021-08-10 | 2021-09-07 | 北京煜鼎增材制造研究院有限公司 | High-strength high-toughness high-damage-tolerance titanium alloy and preparation method thereof |
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| CN101760667A (en) * | 2008-12-23 | 2010-06-30 | 北京有色金属研究总院 | Novel high strength and toughness titanium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119606A (en) * | 2016-08-26 | 2016-11-16 | 西部超导材料科技股份有限公司 | A kind of WSTi45561 superhigh intensity titanium alloy and preparation method thereof |
| CN106148761A (en) * | 2016-08-31 | 2016-11-23 | 中国船舶重工集团公司第七二五研究所 | A kind of anti-corrosion solderable titanium alloy of high intensity high impact toughness and preparation method thereof |
| CN106148761B (en) * | 2016-08-31 | 2017-12-08 | 中国船舶重工集团公司第七二五研究所 | A kind of anti-corrosion solderable titanium alloy of high intensity high impact toughness and preparation method thereof |
| CN106435265A (en) * | 2016-09-14 | 2017-02-22 | 沈阳泰恒通用技术有限公司 | High-strength Ti alloy for springs for rail transit |
| CN109971999A (en) * | 2019-04-28 | 2019-07-05 | 西北有色金属研究院 | A kind of 1500MPa grades of superelevation be strong, in tough titanium alloy |
| CN113355559A (en) * | 2021-08-10 | 2021-09-07 | 北京煜鼎增材制造研究院有限公司 | High-strength high-toughness high-damage-tolerance titanium alloy and preparation method thereof |
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