CN102181747B

CN102181747B - Alpha+beta type titanium alloy with high cold and hot forming properties

Info

Publication number: CN102181747B
Application number: CN 201110117620
Authority: CN
Inventors: 雷力明; 黄旭; 李臻熙; 李四清
Original assignee: BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
Current assignee: BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2012-09-26
Anticipated expiration: 2031-05-06
Also published as: CN102181747A

Abstract

The invention belongs to the technical field of alloys, and relates to an alpha+beta type titanium alloy with high cold and hot forming properties. The alloy is characterized by comprising the following components in percentage by weight: 2.8 to 3.7 percent of Al, 2.5 to 3.5 percent of V, 1.5 to 2.4 percent of Mo, 1.5 to 3.8 percent of Zr, 1.3 to 1.6 percent of Fe and the balance of Ti, wherein the total content of impurity elements is less than or equal to 0.3 percent; the content of clearance impurity element C is less than or equal to 0.04 percent; the content of O is less than or equal to 0.12 percent; the content of N is less than or equal to 0.03 percent; and the content of H is less than or equal to 0.015 percent. The mechanical property of the alpha+beta type titanium alloy is equivalent to that of a TC4 alloy, and the alpha+beta type titanium alloy has the high cold and hot forming properties and can be used for manufacturing a great number of components and parts which have complicated shapes.

Description

A kind of alpha and beta type titan alloy with good cold and hot plasticity

Technical field

The invention belongs to the alloy technology field, relate to a kind of alpha and beta type titan alloy with good cold and hot plasticity.

Background technology

Titanium or titanium alloy is widely used in industrial circles such as Aeronautics and Astronautics, weapons, automobile because of having advantages such as high specific strength, solidity to corrosion be good.Development through decades; Developed the titanium alloy of the tens of kinds of trades mark both at home and abroad; Though it is of a great variety; But under factor affecting such as technology maturity and over-all properties, have only a few alloying constituent to obtain widespread adoption, wherein TC4 (Ti-6A1-4V) alloy is a purposes titanium alloy the most widely.In all titanium alloy Application Areass such as aviation, automobile, the energy, naval vessel, chemical industry, medicine equipment and sports goods, the proportion of TC4 alloy accounts for more than 50%, and has surpassed 70% especially in this numeral of aviation field.The TC4 alloy only is fit to heat processing and forming, can not carry out cold shaping.

Summary of the invention

The objective of the invention is: propose a kind of mechanical property and TC4 alloy phase and work as, and the alpha and beta type titan alloy that has good cold and hot plasticity simultaneously.

Technical scheme of the present invention is: a kind of alpha and beta type titan alloy with good cold and hot plasticity is characterized in that: the weight percent of this alloying constituent consists of: Al:2.8%～3.7%; V:2.5%～3.5%; Mo:1.5%～2.4%; Zr:1.5%～3.8%; Fe:1.3%～1.6%; Surplus is Ti; Wherein, impurity element total amount≤0.3%, and interstitial impurity Elements C≤0.04%; O≤0.12%; N≤0.03%; H≤0.015%.

Advantage of the present invention is: alpha and beta type titan alloy of the present invention is not only worked as with the TC4 alloy phase aspect mechanical property, and has good cold and hot plasticity, can be used to make the many complex partses that can't use the TC4 alloy to make.In addition; Have good cold formability and help reducing the production cost of alloy; With of the application of its alternative or partly alternative TC4 alloy, can not only create huge economic benefit, and can enlarge and promote range of application and the scale of titanium alloy at each industrial circle at industrial circle.

Embodiment

Explain further details in the face of the present invention down, a kind of alpha and beta type titan alloy with good cold and hot plasticity is characterized in that: the weight percent of this alloying constituent consists of: Al:2.8%～3.7%; V:2.5%～3.5%; Mo:1.5%～2.4%; Zr:1.5%～3.8%; Fe:1.3%～1.6%; Surplus is Ti; Wherein, impurity element total amount≤0.3%, and interstitial impurity Elements C≤0.04%; O≤0.12%; N≤0.03%; H≤0.015%.

According to the alpha and beta type titan alloy with good cold and hot plasticity recited above, it is characterized in that: the equivalent thickness of aluminium of this alloy [Al] _When≤4.2, [Al] _WhenCalculation formula be:

[Al] _When=%Al+%Zr/6; In the formula, % representes the weight percent of each element.

The preparation process of titanium alloy of the present invention is: according to the mentioned component scope and the equivalent thickness of aluminium require the proportioning titanium alloy, starting material can be selected pure Al, Al-V master alloy, Al-Mo master alloy, V-Fe master alloy, Ti-Fe master alloy, Ti-Mo master alloy, zirc sponge, Titanium Sponge 40-60 mesh etc. for use.By being pressed into electrode behind the formulated component batch mixing, melting obtains alloy cast ingot twice or three times in vacuum consumable electrode arc furnace.After ingot casting strips off the skin, cuts rising head and tail end; Process cogging forging, the inferior all kinds of work in-process that are out of shape, finally forge or be rolled into titanium alloys of the present invention such as bar, slab, thin plate, tubing, forging of middle many fire can be used for the manufacturing engineering component through these alloy work in-process after the suitable heat treatment.Cogging Forge Heating temperature is 1050 ℃～1150 ℃, and the pier Heating temperature of pulling out is below the alloy beta transus temperature 40 ℃～100 ℃ repeatedly, i.e. T _β-40 ℃～100 ℃; Finally be formed in room temperature or T _βCarry out under-40 ℃～150 ℃.

Embodiment 1:

(starting material use Al-65%V master alloy, Ti-32%Mo master alloy, V-50%Fe master alloy, 0 grade of Titanium Sponge 40-60 mesh, firearm zirc sponge and pure Al for weight percent, %) alloyage material to press nominal composition Ti-3.5Al-3V-2Mo-1.5Zr-1.3Fe.Be pressed into electrode behind the batch mixing, obtain alloy cast ingot three times with the vacuum consumable electrode arc furnace melting.[Al] of alloy _When=3.75, meet the equivalent thickness of aluminium requirement of the present invention to alloy.After ingot casting strips off the skin, cuts rising head and tail end; Forge 1150 ℃ of coggings; And under T β-40 ℃～100 ℃, carry out many fire time piers and pull out with thinning microstructure, at last under T β-100 ℃, be rolled into the sheet material that thickness is 10mm, after T β-100 ℃/1h/AC vacuum annealing thermal treatment acquisition sheet material roll to the mechanical property measured value be: ys 965MPa; Breaking tenacity 1033Mpa, unit elongation 11%.The superplastic forming temperature of this alloy annealing sheet material has shown good thermoforming ability than low about 150 ℃ of TC4 alloy.

Embodiment 2:

(starting material use Al-75%V master alloy, Al-55%Mo master alloy, V-50%Fe master alloy, 0 grade of Titanium Sponge 40-60 mesh, firearm zirc sponge and pure Al for weight percent, %) alloyage material to press nominal composition Ti-3.2Al-3V-1.5Mo-1.5Zr-1.4Fe.Be pressed into electrode behind the batch mixing, obtain alloy cast ingot three times with the vacuum consumable electrode arc furnace melting.[Al] of alloy _When=3.45, meet the equivalent thickness of aluminium requirement of the present invention to alloy.After ingot casting strips off the skin, cuts rising head and tail end, forge 1150 ℃ of coggings, and at T _βCarry out many fire time piers under-40 ℃～100 ℃ and pull out, at T with thinning microstructure _βBe rolled into the sheet material that thickness is 12mm under-100 ℃, be rolled into the thin plate of 1.5mm～3.0mm subsequently at the room temperature multi-pass, through T _βObtain after-100 ℃/1h/AC vacuum annealing thermal treatment thin plate roll to the mechanical property measured value be: ys 897MPa, breaking tenacity 960Mpa, unit elongation 13%.

The alloy nominal composition of embodiment 3～embodiment 16 is referring to table 1.

The alloy nominal composition of table 1 embodiment 3～embodiment 16

The foregoing description alloy prepares process and embodiment 1 and 2 is similar, and they both can thermoforming, also can the room temperature cold shaping.The thin plate of 1.5mm～3.0mm that these alloy rollings become is through T _βAfter-100 ℃/1h/AC vacuum annealing thermal treatment along roll to the mechanical property representative value be: ys>=885MPa, breaking tenacity>=950MPa, unit elongation>=6%.

Claims

1. alpha and beta type titan alloy with good cold and hot plasticity, it is characterized in that: the weight percent of this alloying constituent consists of: Al:2.8%～3.7%; V:2.5%～3.5%; Mo:1.5%～2.4%; Zr:1.5%～3.8%; Fe:1.3%～1.6%; Surplus is Ti; Wherein, impurity element total amount≤0.3%, and interstitial impurity Elements C≤0.04%; O≤0.12%; N≤0.03%; H≤0.015%; The equivalent thickness of aluminium of this alloy [Al] _When≤4.2, [Al] _WhenCalculation formula be: [Al] _When=%Al+%Zr/6; In the formula, % representes the weight percent of each element.