CN108994077B - A kind of anisotropic milling method of weakening TC4 titanium alloy plate - Google Patents
A kind of anisotropic milling method of weakening TC4 titanium alloy plate Download PDFInfo
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- CN108994077B CN108994077B CN201810604759.9A CN201810604759A CN108994077B CN 108994077 B CN108994077 B CN 108994077B CN 201810604759 A CN201810604759 A CN 201810604759A CN 108994077 B CN108994077 B CN 108994077B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 50
- 238000003801 milling Methods 0.000 title claims abstract description 15
- 230000003313 weakening effect Effects 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000005098 hot rolling Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 230000009466 transformation Effects 0.000 description 5
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000905 alloy phase Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000000646 scanning calorimetry Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/06—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
Abstract
The present invention discloses a kind of anisotropic milling method of weakening TC4 titanium alloy plate, belongs to Plastic Forming field.On the one hand the present invention mitigates or weakens the anisotropy of TC4 titanium alloy plate by the method that repeatedly commutation rolling is combined with heat treatment, improve structure property uniformity, obtain high-quality TC4 titanium alloy plate；On the other hand shorten process flow, reduce energy consumption, reduce manufacturing cost, obtain the TC4 titanium alloy plate of high-quality, low cost, finally to expand the application field of TC4 titanium alloy plate.
Description
Technical field
The present invention relates to a kind of anisotropic milling methods of weakening TC4 titanium alloy plate, belong to Plastic Forming field.
Background technique
Roll forming technology is between rolled piece is dragged in roll by the frictional force of rotary roller, while applying by roll
Pressure makes rolled piece that a kind of material processing method of compressive deformation occur between roll.After rolled piece is by rolling, not only make rolled piece
The microstructure and property of shape, change in size and rolled piece is also improved, and is mainly used to produce profile, plate, tubing.
TC4 titanium alloy is a kind of typical " alpha+beta " type diphasic titanium alloy, and nominal composition is Ti-6Al-4V, and α/β phase turns
Temperature is 980 DEG C, a small amount of Al(α stable element) intensity and heat resistance that can be improved alloy, to the plasticity of alloy without bright
Development is rung, a small amount of V(beta stable element) it can play the role of refining crystal grain and improve plastic forming ability.TC4 titanium alloy has
The excellent performances such as density is small, specific strength is high, corrosion resistance is good, nonmagnetic, good biocompatibility, as a kind of important structural wood
Material is widely applied in fields such as Aeronautics and Astronautics, chemical industry, naval vessel, automobile, weapons, sport, medical treatment.
The rolling of TC4 titanium alloy plate has two kinds of hot rolling, cold rolling, since its alpha+beta two phase structure causes the plate rolled out each
Anisotropy is stronger, and edge crack is more serious, leads to that yield rate is low, product cost is higher.And the original of TC4 titanium alloy rolled plate
Material is substantially vacuum consumable arc-melting furnace and passes through the billet that 3~4 passage meltings obtain, and is then using hammer cogging
Square ingot or slab ingot finally obtain plate using cold rolling or hot rolling, and the technological process of production is long, process is more, energy consumption is high, causes most
Soleplate material higher cost, and limit its extensive use.
Summary of the invention
The purpose of the present invention is to provide a kind of anisotropic milling method of weakening TC4 titanium alloy plate, including it is following
Step:
(1) it by 10~70 DEG C more than TC4 titanium alloy cuboid blank heating to phase point temperature (980 DEG C of transformation temperature) and protects
20 ~ 30min of temperature；
(2) heating once and rolling is first carried out using four-high reversing mill, rolls the first passage first along length direction, later
Blank is alongst rotated by 90 ° and carries out width and thickness commutation and inversely rolls the second passage, repeats the process 1~2
It is secondary, then 90 ° of blank transverse rotation are carried out again the hot rolling repeatedly of length and thickness direction commutation；
(3) when temperature is reduced to 882 DEG C or less, blank obtained by step (2) is sent to being heated to 910 in induction heater
~940 DEG C, and 5 ~ 10min is kept the temperature, it is then rolled, breaking down direction is perpendicular to last rolling direction, and long thickness is changed later
To rolling 1~2 time, the then plate of unidirectional hot rolling 2~4 passage to 4~7mm thickness again, 820~850 DEG C of finishing temperature.
(4) 20~60 DEG C of annealing more than recrystallization temperature by TC4 titanium alloy plate after finish to gauge, cools to room temperature with the furnace,
Obtain TC4 titanium alloy plate.
Preferably, mill speed is 1.1~1.4m/s, width and thickness commutation rolling 4~6 in step (2) of the present invention
Secondary, deflection 8~15%, length and thickness direction commutation roll 3~5 passages per pass, per pass deflection 17~24%, accumulation
Deflection is 67~73%.
Preferably, in step (3) of the present invention in the two fiery operations of rolling: deflection 18~22% per pass, cumulative deformation are
65~75%.
Preferably, TC4 titanium alloy plate total deformation of the present invention is 88~94%.
Preferably, annealing temperature is 770~810 DEG C in step (4) of the present invention, and annealing time 1h is cooled to the furnace
It is air-cooled after 590 DEG C.
Preferably, the blank that the present invention uses (EB furnace) melting of electron beam cold hearth melting furnace to obtain, Direct Rolling are configured to
Plate.
Beneficial effects of the present invention:
(1) on the one hand the present invention mitigates or weakens each to different of TC4 titanium alloy plate by the milling method that repeatedly commutates
Property, structure property uniformity is improved, high-quality TC4 titanium alloy plate is obtained；On the other hand shorten process flow, reduce energy consumption,
Manufacturing cost is reduced, the TC4 titanium alloy plate of high-quality, low cost is finally obtained, to expand the application neck of TC4 titanium alloy plate
Domain.
(2) blank that the present invention is obtained using (EB furnace) melting of electron beam cold hearth melting furnace, Direct Rolling are configured to plate,
The technique that the blank for avoiding 3~4 passage of traditional vacuum consumable arc-melting (VAR) from obtaining rolls again after hammer cogging, pole
It is big to shorten process flow and manufacturing cost.
(3) heating and thermal insulation mode of the present invention is chamber type electric resistance furnace heating；Before heating once and rolling temperature extremely by blank heating
(980 DEG C of transformation temperature) keeps the temperature 20~30min more than phase point temperature 10~70 DEG C, guarantees being heated evenly and subsequent rolling for blank
It goes on smoothly.It is heated to 910~940 DEG C in furnace before two fire rollings, keeps the temperature 5~10min, ensure that blank during the rolling process
In two-phase section, resistance of deformation is smaller.By two fire rollings, blank is deformed sufficiently, and the degree of crushing of crystal grain is preferable, plate
Surface quality is also fine.Meanwhile being rolled by two fire, annealing more than recrystallization temperature is conducive to the formation of equiaxed structure.
(4) present invention keeps crystal grain sufficiently broken, obtained titanium alloy plate anisotropy by crossing over many times commutation rolling
It is smaller, solve the anisotropic problem of traditional rolled plate；The TC4 titanium alloy plate as made from the technique compares conventional method
Titanium alloy plate obtained has better tensile strength and plasticity, and isometric microstructure is obvious.
Detailed description of the invention
Fig. 1 is present invention process flow diagram.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments, but protection scope of the present invention is simultaneously
It is not limited to the content.
Embodiment 1
A kind of anisotropic milling method of weakening TC4 titanium alloy plate, forming technology as shown in Figure 1, specific steps such as
Under:
(1) the present embodiment material is Ti-6Al-4V(TC4) titanium alloy, the transformation temperature of TC4 titanium alloy is measured, using differential
It is 980 DEG C that scanning calorimetry (DSC), which measures the alloy phase change point temperature,.
(2) cuboid TC4 titan alloy casting ingot is heated to 1020 DEG C, keeps the temperature 20min.
(3) rectangular solid ingot after heating is carried out two intimately to roll, the first fiery rolling mill practice are as follows: rolling rate is 1.4m/s
, adding up rolling pass is 10 times, and cumulative deformation is about 72%；The first passage is rolled first along length direction, it
Blank is alongst rotated by 90 ° to afterwards and inversely rolled the second passage, i.e., width and thickness commutates, as Fig. 1 1. shown in,
Repeat the process 2 times, roll 6 passages in total, generous commutation per pass deflection 10% or so；Then blank is subjected to length
The hot rolling to commutate repeatedly with thickness direction such as Fig. 1 2. shown in, amount to rolling 4 passages, per pass deflection 20~22% it
Between.
(4) plate after 10 passage of hot rolling is melted down and is heated to 910 DEG C, kept the temperature 5min, then rolled again, rolling side
It is long later commutation rolling 1 time thick to perpendicular to last rolling direction, then again unidirectional 3 passage of hot rolling to 6mm thickness plate
Material amounts to 5 passages of rolling, and deflection is about 65% in the total deformation of 18~20%, two fire rollings per pass, finishing temperature 820
℃；By two fire rollings, a fiery residual process streamline and texture can be obviously removed, TC4 plate following process is improved, and
So that TC4 plate die break is abundant, tissue has been refined.
(5) anneal at 770 DEG C 1h after plate rolling, air-cooled after cooling to 590 DEG C with the furnace, improves the tissue of alloy,
The stress generated in the operation of rolling is eliminated, and then improves the comprehensive performance of TC4 plate.
The TC4 titanium alloy plate that the present embodiment is prepared, total deformation 90% show good comprehensive mechanical property
Can, plate is taken into tensile sample along the direction (RD) finally rolled, lateral (TD) and oblique 45 ° of directions, the mechanical property measured is such as
Shown in table 1.
The mechanical property of TC4 titanium alloy plate after 1 rolling deformation of table
。
Embodiment 2
A kind of anisotropic milling method of weakening TC4 titanium alloy plate, forming technology as shown in Figure 1, specific steps such as
Under:
(1) the present embodiment material is Ti-6Al-4V(TC4) titanium alloy, the transformation temperature of TC4 titanium alloy is measured, using differential
It is 980 DEG C that scanning calorimetry (DSC), which measures the alloy phase change point temperature,.
(2) cuboid TC4 titan alloy casting ingot is heated to 990 DEG C, keeps the temperature 30min.
(3) rectangular solid ingot after heating is carried out two intimately to roll, the first fiery rolling mill practice are as follows: rolling rate is 1.25m/
s
, adding up rolling pass is 9 times, and cumulative deformation is about 73%；The first passage is rolled first along length direction, it
Blank is alongst rotated by 90 ° afterwards and is inversely rolled the second passage (i.e. width and thickness commutation), the process 1 is repeated
Secondary, total to roll 4 passages, generous commutation deflection is 15% or so；Then blank progress length and thickness direction are commutated repeatedly
Hot rolling amounts to 5 passages of rolling, and deflection is between 18~20% per pass.
(4) plate after 9 passage of hot rolling is melted down and is heated to 925 DEG C, kept the temperature 10min, then rolled again, breaking down side
It is long later commutation rolling 1 time thick to perpendicular to last rolling direction, then again unidirectional 4 passage of hot rolling to 4mm thickness plate
Material amounts to 6 passages of rolling, and deflection is between 20~21% per pass, and the total deformation of two fire rollings is about 75%, finishing temperature
834℃；By two fire rollings, a fiery residual process streamline and texture can be obviously removed, TC4 plate following process is improved
Property, and make TC4 plate die break abundant, refine tissue.
(5) anneal at 790 DEG C 1h after plate rolling, air-cooled after cooling to 590 DEG C with the furnace, improves the tissue of alloy,
The stress generated in the operation of rolling is eliminated, and then improves the comprehensive performance of TC4 plate.
The TC4 titanium alloy plate that the present embodiment is prepared, total deformation 93.3% show good comprehensive mechanics
Plate is taken tensile sample along the direction (RD) finally rolled, lateral (TD) and oblique 45 ° of directions, the mechanical property measured by performance
As shown in table 2.
The mechanical property of TC4 titanium alloy plate after 2 rolling deformation of table
。
Embodiment 3
A kind of anisotropic milling method of weakening TC4 titanium alloy plate, forming technology as shown in Figure 1, specific steps such as
Under:
(1) the present embodiment material is Ti-6Al-4V(TC4) titanium alloy, the transformation temperature of TC4 titanium alloy is measured, using differential
It is 980 DEG C that scanning calorimetry (DSC), which measures the alloy phase change point temperature,.
(2) cuboid TC4 titan alloy casting ingot is heated to 1050 DEG C, keeps the temperature 25min.
(3) rectangular solid ingot after heating is carried out two intimately to roll, the first fiery rolling mill practice are as follows: rolling rate is 1.1m/
S, adding up rolling pass is 8 times, and cumulative deformation is about 67%.The first passage is rolled first along length direction, later by blank
It is alongst rotated by 90 ° and inversely rolls the second passage (i.e. width and thickness commutation), repeat the process 1 time, roll 5 in total
Passage, generous commutation deflection is 9% or so；Then total to roll by the hot rolling that blank carries out length and thickness direction commutates repeatedly
3 passages are made, deflection is between 22~24% per pass.
(4) plate after 8 passage of hot rolling is melted down and is heated to 940 DEG C, kept the temperature 7min, then rolled again, breaking down side
It is long later commutation rolling 2 times thick to perpendicular to last rolling direction, then again unidirectional 2 passage of hot rolling to 7mm thickness plate
Material amounts to 5 passages of rolling, and deflection is between 18~19% per pass, and the total deformation of two fire rollings is about 65%, finishing temperature
850℃.By two fire rollings, a fiery residual process streamline and texture can be obviously removed, TC4 plate following process is improved
Property, and make TC4 plate die break abundant, refine tissue.
(5) anneal at 810 DEG C 1h after plate rolling, air-cooled after cooling to 590 DEG C with the furnace, improves the tissue of alloy,
The stress generated in the operation of rolling is eliminated, and then improves the comprehensive performance of TC4 plate.
The TC4 titanium alloy plate that the present embodiment is prepared, total deformation 88.3% show good comprehensive mechanics
Plate is taken tensile sample along the direction (RD) finally rolled, lateral (TD) and oblique 45 ° of directions, the mechanical property measured by performance
As shown in table 3.
The mechanical property of TC4 titanium alloy plate after 3 rolling deformation of table
。
Claims (6)
1. a kind of anisotropic milling method of weakening TC4 titanium alloy plate, which comprises the following steps:
(1) by more than TC4 titanium alloy cuboid blank heating to phase point temperature 10~70 DEG C and keep the temperature 20~30min；
(2) heating once and rolling is first carried out using four-high reversing mill, the first passage is rolled first along length direction, later by base
Material is alongst rotated by 90 ° progress width and thickness commutation and inversely rolls the second passage, the repetition process 1~2 time, so
90 ° of blank transverse rotation are carried out again afterwards the hot rolling repeatedly of length and thickness direction commutation；
(3) when temperature is reduced to 882 DEG C or less, by blank obtained by step (2) send to be heated to 910 in induction heater~
940 DEG C, and 5 ~ 10min is kept the temperature, it is then rolled, breaking down direction is perpendicular to last rolling direction, thick commutation long later
1~2 passage is rolled, then the plate of unidirectional hot rolling 2~4 passage to 4~7mm thickness again, 820~850 DEG C of finishing temperature；
(4) 20~60 DEG C of annealing more than recrystallization temperature by TC4 titanium alloy plate after finish to gauge, cools to room temperature with the furnace, obtains
TC4 titanium alloy plate.
2. weakening the anisotropic milling method of TC4 titanium alloy plate according to claim 1, it is characterised in that: step (2)
Middle mill speed is 1.1~1.4m/s, width and thickness commutation 4~6 passages of rolling, deflection 8~15% per pass, length and
3~5 passages are rolled after thickness direction commutation, per pass deflection 17~24%, the cumulative deformation of heating once and rolling is 67~73%.
3. weakening the anisotropic milling method of TC4 titanium alloy plate according to claim 1, it is characterised in that: step (3)
In in the two fiery operations of rolling: deflection 18~22% per pass, cumulative deformation are 65~75%.
4. weakening the anisotropic milling method of TC4 titanium alloy plate according to claim 1, it is characterised in that: TC4 titanium closes
Golden plate material total deformation is 88~94%.
5. weakening the anisotropic milling method of TC4 titanium alloy plate according to claim 1, it is characterised in that: the step
Suddenly annealing temperature is 770~810 DEG C, annealing time 1h in (4), air-cooled after cooling to 590 DEG C with the furnace.
6. weakening the anisotropic milling method of TC4 titanium alloy plate according to claim 1, it is characterised in that: step (1)
The blank that middle TC4 titanium alloy cuboid blank uses the melting of electron beam cold hearth melting furnace to obtain, subsequent Direct Rolling are configured to plate
Material.
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