CN104372203A

CN104372203A - Novel alpha titanium alloy and preparation method of panel and bar of alpha titanium alloy

Info

Publication number: CN104372203A
Application number: CN201410691128.7A
Authority: CN
Inventors: 李重河; 胡仁民; 张捷宇; 鲁雄刚; 林崇茂; 魏超
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2015-02-25

Abstract

The invention relates to a novel alpha titanium alloy, and belongs to the technical field of an alloy preparation process. The alpha titanium alloy comprises the following components by mass percent: 5.0-7.0wt% of aluminum, 4.0-5.0wt% of chromium, 1.0-2.0wt% of manganese, not more than 0.1wt% of total of oxygen, carbon, nitrogen and hydrogen, and the rest of iron. By using alloying element Cr and Mn with low cost as reinforcing elements of the alpha titanium alloy, the traditional alloy elements with high price such as Sn, Mo, Zr and V are substituted; the result shows that the new alloy has good comprehensive performance. Through the adoption of the titanium alloy disclosed by the invention, the selective range of the alloying elements of the alpha titanium alloy is broadened, and a certain innovation and theoretical property guidance are provided for the further development of the alpha titanium alloy.

Description

The preparation method of a kind of Novel alpha titanium alloy and sheet material and bar

Technical field

The present invention relates to the preparation method of a kind of Novel alpha titanium alloy and section bar thereof, belong to titanium alloy material fabricating technology field.

Background technology

Titanium alloy has the over-all properties of a series of excellences such as the biocompatibility that density is little, specific tenacity is high, high temperature resistant, corrosion-resistant and good, so be widely used at each industrial circle, be called as " space metal ", " marine metal ", " SMART METALS " etc.In addition, since titanium sponge industrialization, the throughput of titanium is also rising year by year, and titanium is very wide in distributed in nature, the content of titanium in the earth's crust is 0.64%, in all elements, ranked nineth position, is only second to aluminium, iron and magnesium in metallic element, occupy the 4th, also more than the summation of common copper, lead, zinc metal reserves.By the end of 2009, the titanium resource verified in the world was (with TiO ₂meter) have 24.84 hundred million tons, the economic reserve with the economic exploitation value is 13.82 hundred million tons, can be described as aboundresources, so the exploitation prospect of titanium alloy is very wide.

Through long-term practice, the problem received much concern when the damage tolerance design that intensity and toughness are together taken into account is become titanium or titanium alloy materials application, preparing the target that intensity is higher, the better titanium alloy material of toughness is constantly pursuit, is the most basic means at many technique means interalloies improving titanium alloy highly malleablized.Titanium alloy can be divided into α, (alpha+beta) and beta titanium alloy three major types by the tissue characteristic after annealing, wherein, alpha titanium alloy is the single-phased alloy of α phase sosoloid composition, no matter be at general temperature or at higher practical application temperature, matrix phase is α phase, tissue stabilization, and alpha titanium alloy density is little, have good heat resistance, thermostability and excellence room temperature, very low temperature and hot properties, so the research and development of alpha titanium alloy be always countries in the world pay close attention to focus.

Through long-term practice, the problem received much concern when the damage tolerance design that intensity and toughness are together taken into account is become titanium or titanium alloy materials application.Prepare the target that intensity is higher, the better titanium alloy material of toughness is constantly pursuit.Being the most basic means at many technique means interalloies improving titanium alloy highly malleablized, is also the important method of development of new titanium alloy.But the selection of the alloy element of alpha titanium alloy is but confined to a few element at present always, as Sn, Mo, Zr, V, etc., less for the trial of novel alloy element as elements such as Cr and Mn, therefore constantly different types of alloying element is attempted, and then study its affecting laws to the structure and properties of titanium alloy, be the problem that Novel alpha titanium alloy development aspect needs to solve emphatically.

Summary of the invention

For Novel alpha titanium alloy research and development aspect Problems existing, the object of this invention is to provide a kind of Novel alpha titanium alloy, is a kind of Novel alpha titanium alloy containing Cr and Mn alloying element.A kind of Novel alpha titanium alloy of the present invention, it is characterized in that having following component and mass percent: the aluminium of 5.0 ~ 7.0 wt%, the chromium of 4.0 ~ 5.0 wt%, the manganese of 1.0 ~ 2.0 wt%, other oxygen, carbon, nitrogen, hydrogen total amount≤0.1 wt%, surplus is titanium;

A kind of Novel alpha of the present invention titanium alloy profile preparation method is characterized in that having following preparation process:

A. preparation of plates

CCIM method (i.e. vacuum induction suspended smelting method): by pure titanium, fine aluminium, pure chromium, pure manganese, after batching, in chamber type electric resistance furnace, namely pre-treatment is incubated 12 hours at 180 DEG C, then water jacketed copper crucible is placed in, prepurging recoils the argon gas of 0.006 MPa for 4 times afterwards as shielding gas repeatedly, higher than melt back in its fusing point 10-150 DEG C of temperature range 4 times, obtain oval ingot casting, gained ingot casting is heated to 760 DEG C, hot rolling on open-train mill, 5 passages roll, the deformation rate of a time is no more than 15%, obtains the sheet material that thickness is 6 ~ 7mm; Then this sheet material is remake vacuum annealing thermal treatment, annealing temperature is 700 DEG C, and soaking time is 2h, and the type of cooling is air cooling;

B. the preparation of bar

VAR method (i.e. vacuum induction consumable smelting method): by pure titanium, fine aluminium, pure chromium, titanium manganese master alloy, extrusion process is adopted to be pressed into electrode block after batching, then by electric-arc welding, electrode block is welded together as vacuum consumable electrode in vacuum-argon filling case, after energising, between consumable electrode and molten bath, arc-over produces high temperature by electrode melting, obtain metal titanium ingot, titanium ingot is heated to 1050 DEG C of cogging forgings 2 ~ 3 times, by forging stock, jumping-up and pulling forging 2 ~ 3 fire obtain the rolling rod base of φ 20mm repeatedly, by clean for surface crack polishing, air cooling is to room temperature, obtain finished product bar, then this bar is remake vacuum annealing thermal treatment, annealing temperature is 700 DEG C, and soaking time is 2h, and the type of cooling is air cooling.

Embodiment

Below by specific embodiment, the invention will be further described.

embodiment 1

By pure titanium, fine aluminium, pure chromium, pure manganese; prepare burden by the composition proportion of table 1; pre-treatment in common chamber type electric resistance furnace (180 DEG C are incubated 12 hours); remove the free water in alloy raw material; then water jacketed copper crucible is placed in; prepurging recoils the argon gas of 0.006 MPa for 4 times afterwards as shielding gas repeatedly; melt back 4 times; obtain oval ingot casting; gained ingot casting is heated to 760 DEG C, hot rolling on open-train mill, and 5 passages roll; the deformation rate of a time is no more than 15%, obtains the sheet material that thickness is 6 ~ 7mm.After the sheet material that rolling obtains is heat-treated by the heat treating regime of table 2, sampling room-temperature mechanical property test is carried out in requirement according to GB GB/T228-2002, its mechanical property is in table 2.

The composition proportion of table 1 embodiment 1 interalloy

Chemical element

Al

Cr

Mn

O

N

C

H

Ti

Content (wt%)

6.36

4.77

1.64

0.05

0.001

Surplus

The mechanical property of sheet material in table 2 embodiment 1

Heat treating regime	Tensile strength Rm(MPa)	Yield strength Rp0.2(MPa)	Elongation after fracture A(%)	Relative reduction in area Z(%)	Elastic modulus E (GPa)
						700℃/2h/AC	1060.0	1039.0	8.4	37.0	95.0

embodiment 2

By pure titanium, fine aluminium, pure chromium, titanium manganese master alloy, prepare burden by the composition proportion of table 3, extrusion process is adopted to be pressed into electrode block after batching, then by electric-arc welding, electrode block is welded together as vacuum consumable electrode in vacuum-argon filling case, after energising, between consumable electrode and molten bath, arc-over produces high temperature by electrode melting, obtain metal titanium ingot, titanium ingot is heated to 1050 DEG C of cogging forgings 2 ~ 3 times, by forging stock, jumping-up and pulling forging 2 ~ 3 fire obtain the excellent base of φ 20mm repeatedly, by clean for surface crack polishing, air cooling, to room temperature, obtains finished product bar.The bar obtained is by after the heat treating regime thermal treatment of table 4, and sampling room-temperature mechanical property test is carried out in requirement according to GB GB/T228-2002, its mechanical property is in table 4.

The composition proportion of table 3 embodiment 2 interalloy

Chemical element

Al

Cr

Mn

O

N

C

H

Ti

Content (wt%)

6.36

4.79

1.65

0.05

0.001

Surplus

The mechanical property of bar in table 4 embodiment 2

Heat treating regime	Tensile strength Rm(MPa)	Yield strength Rp0.2(MPa)	Elongation after fracture A(%)	Relative reduction in area Z(%)	Elastic modulus E (GPa)
						700℃/2h/AC	1068.0	1043.0	8.2	35.0	93.0

Claims

1. a Novel alpha titanium alloy, is characterized in that: the composition of Novel alpha titanium alloy is the aluminium of 5.0 ~ 7.0 wt%, the chromium of 4.0 ~ 5.0 wt%, the manganese of 1.0 ~ 2.0 wt%, and other oxygen, carbon, nitrogen, hydrogen total amount≤0.1 wt%, surplus is titanium.

2. the preparation method of a Novel alpha titanium alloy profile is characterized in that having following preparation process:

A. sheet material preparation

CCIM method (i.e. vacuum induction suspended smelting method): by pure titanium, fine aluminium, pure chromium, pure manganese, after preparing burden according to above-mentioned formula, in chamber type electric resistance furnace, namely pre-treatment is incubated 12 hours at 180 DEG C, then water jacketed copper crucible is placed in, prepurging recoils the argon gas of 0.006 MPa for 4 times afterwards as shielding gas repeatedly, higher than melt back within the scope of its fusing point 10-150 DEG C 4 times, obtain oval ingot casting, gained ingot casting is heated to 760 DEG C, hot rolling on open-train mill, 5 passages roll, the deformation rate of a time is no more than 15%, obtains the sheet material that thickness is 6 ~ 7mm; Then this sheet material is remake vacuum annealing thermal treatment, annealing temperature is 700 DEG C, and soaking time is 2h, and the type of cooling is air cooling;

B. bar preparation

VAR method (i.e. vacuum induction consumable smelting method): by pure titanium, fine aluminium, pure chromium, titanium manganese master alloy, extrusion process is adopted to be pressed into electrode block according to after above-mentioned formula batching, then in vacuum-argon filling case, electrode block is welded together by electric-arc welding the vacuum consumable electrode obtaining desired size, after energising, between consumable electrode and molten bath, arc-over produces high temperature by electrode melting, obtain metal titanium ingot, titanium ingot is heated to 1050 DEG C of cogging forgings 2 ~ 3 times, by forging stock, jumping-up and pulling forging 2 ~ 3 fire obtain the rolling rod base of φ 20mm repeatedly, by clean for surface crack polishing, air cooling is to room temperature, obtain finished product bar, then this bar is remake vacuum annealing thermal treatment, annealing temperature is 700 DEG C, and soaking time is 2h, and the type of cooling is air cooling.