CN104404305A - Yttrium-modified TB2 titanium alloy - Google Patents

Yttrium-modified TB2 titanium alloy Download PDF

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Publication number
CN104404305A
CN104404305A CN201410810252.0A CN201410810252A CN104404305A CN 104404305 A CN104404305 A CN 104404305A CN 201410810252 A CN201410810252 A CN 201410810252A CN 104404305 A CN104404305 A CN 104404305A
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China
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titanium alloy
forging
yttrium
alloy
modification
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CN201410810252.0A
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Chinese (zh)
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张鹏省
侯智敏
李思兰
尹雁飞
毛小南
赵永庆
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西北有色金属研究院
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Publication of CN104404305A publication Critical patent/CN104404305A/en

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Abstract

The invention discloses an yttrium-modified TB2 titanium alloy which is composed of the following components in percentage by weight: 2.5-3.5% of Al, 4.7-5.7% of Mo, 7.5-8.5% of Cr, 4.7-5.7% of V, 0.005-0.1% of Y, and the balance of Ti and inevitable impurities. The rare-earth element Y is added to perform alloying treatment on the TB2 titanium alloy, so that the rare-earth element Y and impurity elements (C, O, H, N and the like) in the TB2 titanium alloy form rare-earth refractory substances, thereby effectively reducing the distribution of the impurity elements at the grain boundary and solving the problem of grain boundary weakness caused by the impurity elements (C, O, H, N and the like) to some extent. The rare-earth refractory substances have interactions with the recrystallized grain boundary so as to inhibit the motion of the grain boundary, thereby refining the crystal grain and enhancing the strength and plasticity of the TB2 titanium alloy.

Description

A kind of yttrium modification TB2 titanium alloy

Technical field

The invention belongs to titanium alloy technical field, be specifically related to a kind of yttrium modification TB2 titanium alloy.

Background technology

TB2 is a kind of metastable beta-type titanium alloy, has the advantage such as good process plastic, higher intensity and fracture toughness property and dark hardening capacity.TB2 titanium alloy after heat treatment, there is high intensity and good plasticity, have in Aeronautics and Astronautics field and apply widely, be commonly used for parts such as producing star bullet connecting band, aviation rivet and fastening piece, ultracentrifuge rotary head, elastic element and solid engines housing.TB2 titanium alloy yield tensile ratio is high, resistance to deformation is larger, not easily cold deformation, usual employing thermal processing distortion technique improves the structure property of alloy, but adopt TB2 titanium alloy in the process of manufactured parts, be easy to the intensity and the unmatched problem of plasticity that occur TB2 titanium alloy, cause the yield rate of product lower, therefore be badly in need of seeking the TB2 titanium alloy with higher-strength and plasticity, and its intensity can be mated mutually with plasticity, this has important pushing effect for the widespread use improving TB2 titanium alloy.

Summary of the invention

Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, a kind of yttrium modification TB2 titanium alloy is provided, by adding rare earth element y in TB2 titanium alloy, Alloying Treatment is carried out to it, effectively reduce the distribution of TB2 titanium alloy grain boundaries impurity element C, O, N, H etc., solve the problem of grain-boundary weakness to a certain extent, improve TB2 titanium alloy plasticity, simultaneously also refinement crystal grain, improve the intensity of TB2 titanium alloy.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of yttrium modification TB2 titanium alloy, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 2.5% ~ 3.5%, Mo 4.7% ~ 5.7%, Cr 7.5% ~ 8.5%, V 4.7% ~ 5.7%, Y 0.005% ~ 0.1%, surplus is Ti and inevitable impurity.

Above-mentioned a kind of yttrium modification TB2 titanium alloy, is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3% ~ 3.5%, Mo 5% ~ 5.6%, Cr 7.5% ~ 8.1%, V 5.2% ~ 5.7%, Y 0.05% ~ 0.1%, surplus is Ti and inevitable impurity.

Above-mentioned a kind of yttrium modification TB2 titanium alloy, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.24%, Mo 5.19%, Cr 8.09%, V 5.21%, Y 0.05%, surplus is Ti and inevitable impurity.

Above-mentioned a kind of yttrium modification TB2 titanium alloy, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.28%, Mo 5.58%, Cr 7.53%, V 5.68%, Y 0.09%, surplus is Ti and inevitable impurity.

Above-mentioned a kind of yttrium modification TB2 titanium alloy, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.2%, Mo 5.46%, Cr 7.9%, V 5.42%, Y 0.1%, surplus is Ti and inevitable impurity.

The preparation method of yttrium modification TB2 titanium alloy of the present invention adopts the customary preparation methods of titanium alloy, detailed process is: select suitable raw material first as required, electrode is pressed into by after described raw material mixing by design mix, then described electrode vacuum consumable electrode arc furnace is obtained alloy cast ingot through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, many fire time repeatedly upsetting pull forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining yttrium modification TB2 titanium alloy plate after solution treatment and Wetted constructures.

The present invention compared with prior art has the following advantages:

1, the present invention adds rare earth element y in TB2 titanium alloy, carry out Alloying Treatment, the impurity elements such as C, O, N, H of being easily enriched in grain boundaries and rare earth element y effect is made to form rare refractory thing, effectively reduce the distribution of impurity element at grain boundaries, solve the grain-boundary weakness problem caused by impurity elements such as C, O, N, H to a certain extent, thus improve the room-temperature mechanical property of TB2 titanium alloy.

2, yttrium modification TB2 titanium alloy of the present invention, due to the existence of rare refractory thing, understand the crystal boundary generation interaction with TB2 titanium alloy, refining alloy grain-size, and tiny alloy grain is out of shape when stressed effect more even, not easily there is stress concentration, be conducive to improving TB2 titanic alloy machining technique and product performance, be conducive to the mass production of TB2 titanium alloy product, and improve the yield rate of TB2 titanium alloy product.

3, yttrium modification TB2 titanium alloy of the present invention is after adding appropriate Y element, rare refractory thing hinders grain boundary, inhibit grain growth, simultaneously because grain boundaries atomic arrangement is disorderly, dislocation structure is complicated, therefore crystal grain is more tiny, crystal boundary is more, when dislocation changes slip direction through crystal boundary, then need to consume more energy, now dislocation glide becomes difficulty, distortion is difficult to hand on, therefore improve the non-deformability of TB2 titanium alloy, thus improve intensity and the plasticity of TB2 titanium alloy, TB2 titanium alloy is made to have good comprehensive mechanical property.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Fig. 1 is the metallographic structure figure of the embodiment of the present invention 1 yttrium modification TB2 titanium alloy.

Fig. 2 is the metallographic structure figure of the embodiment of the present invention 2 yttrium modification TB2 titanium alloy.

Fig. 3 is the metallographic structure figure of the embodiment of the present invention 3 yttrium modification TB2 titanium alloy.

Embodiment

Yttrium modification TB2 titanium alloy of the present invention is grouped into by the one-tenth of following weight percentage: Al2.5% ~ 3.5%, Mo 4.7% ~ 5.7%, Cr 7.5% ~ 8.5%, V 4.7% ~ 5.7%, Y 0.005% ~ 0.1%, surplus is Ti and inevitable impurity.The concrete preparation process of this yttrium modification TB2 titanium alloy is: select suitable raw material as required, described raw material comprises aluminum-vanadium alloy, aluminium molybdenum alloys, titanium maxter alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing by design mix, then described electrode vacuum consumable electrode arc furnace is obtained alloy cast ingot after three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 3 ~ 4 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining yttrium modification TB2 titanium alloy plate after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1000 DEG C ~ 1150 DEG C, the Heating temperature of described upsetting pull forging is 950 DEG C ~ 1050 DEG C, the Heating temperature of described one-tenth shape forging is 800 DEG C ~ 900 DEG C, the temperature of described solution treatment is 750 DEG C ~ 800 DEG C, the soaking time of solution treatment is 1h ~ 2h, the temperature of described Wetted constructures is 560 DEG C ~ 580 DEG C, and the soaking time of Wetted constructures is 6h ~ 8h.

Embodiment 1

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3.24Al-5.19Mo-8.09Cr-5.21V-0.05Y, and namely weight percentage is: Al 3.24%, Mo 5.19%, Cr8.09%, V 5.21%, Y 0.05%, surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3.24Al-5.19Mo-8.09Cr-5.21V-0.05Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 3 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1150 DEG C, the Heating temperature of described upsetting pull forging is 1000 DEG C, the Heating temperature of described one-tenth shape forging is 850 DEG C, the temperature of described solution treatment is 780 DEG C, the soaking time of solution treatment is 2h, the temperature of described Wetted constructures is 580 DEG C, and the soaking time of Wetted constructures is 8h.

Fig. 1 is the metallographic structure figure of the present embodiment yttrium modification TB2 titanium alloy, and as can be seen from Figure 1, the crystal grain of yttrium modification TB2 titanium alloy is tiny.The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1215MPa, Rp0.2=1150MPa, A=12%, Z=30%.

Embodiment 2

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3.28Al-5.58Mo-7.53Cr-5.68V-0.09Y, and namely weight percentage is: Al 3.28%, Mo 5.58%, Cr7.53%, V 5.68%, Y 0.09%, surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3.28Al-5.58Mo-7.53Cr-5.68V-0.09Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 3 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1150 DEG C, the Heating temperature of described upsetting pull forging is 1000 DEG C, the Heating temperature of described one-tenth shape forging is 850 DEG C, the temperature of described solution treatment is 780 DEG C, the soaking time of solution treatment is 2h, the temperature of described Wetted constructures is 580 DEG C, and the soaking time of Wetted constructures is 8h.

Fig. 2 is the metallographic structure figure of the present embodiment yttrium modification TB2 titanium alloy, and as can be seen from Figure 2, the crystal grain of yttrium modification TB2 titanium alloy is tiny.The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1266MPa, Rp0.2=1224MPa, A=15%, Z=38%.

Embodiment 3

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3.2Al-5.46Mo-7.9Cr-5.42V-0.1Y, and namely weight percentage is: Al 3.2%, Mo 5.46%, Cr 7.9%, V 5.42%, Y 0.1%, surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3.2Al-5.46Mo-7.9Cr-5.42V-0.1Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 4 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1150 DEG C, the Heating temperature of described upsetting pull forging is 1000 DEG C, the Heating temperature of described one-tenth shape forging is 850 DEG C, the temperature of described solution treatment is 780 DEG C, the soaking time of solution treatment is 2h, the temperature of described Wetted constructures is 580 DEG C, and the soaking time of Wetted constructures is 8h.

Fig. 3 is the metallographic structure figure of the present embodiment yttrium modification TB2 titanium alloy, and as can be seen from Figure 3, the crystal grain of yttrium modification TB2 titanium alloy is tiny.The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1273MPa, Rp0.2=1222MPa, A=15%, Z=35%.

Embodiment 4

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-2.5Al-4.7Mo-7.5Cr-4.7V-0.1Y, and namely weight percentage is: Al 2.5%, Mo 4.7%, Cr 7.5%, V 4.7%, Y 0.1%, surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-2.5Al-4.7Mo-7.5Cr-4.7V-0.1Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 3 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1075 DEG C, the Heating temperature of described upsetting pull forging is 1050 DEG C, the Heating temperature of described one-tenth shape forging is 800 DEG C, the temperature of described solution treatment is 750 DEG C, the soaking time of solution treatment is 1.5h, the temperature of described Wetted constructures is 560 DEG C, and the soaking time of Wetted constructures is 7h.

The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1213MPa, Rp0.2=1156MPa, A=12%, Z=29%.

Embodiment 5

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3.5Al-5.7Mo-8.5Cr-5.7V-0.005Y, and namely weight percentage is: Al 3.5%, Mo 5.7%, Cr 8.5%, V 5.7%, Y 0.005%, surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3.5Al-5.7Mo-8.5Cr-5.7V-0.005Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 3 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1000 DEG C, the Heating temperature of described upsetting pull forging is 950 DEG C, the Heating temperature of described one-tenth shape forging is 900 DEG C, the temperature of described solution treatment is 800 DEG C, the soaking time of solution treatment is 2h, the temperature of described Wetted constructures is 570 DEG C, and the soaking time of Wetted constructures is 7h.

The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1150MPa, Rp0.2=1075MPa, A=13%, Z=30%.

Embodiment 6

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3Al-5.6Mo-7.5Cr-5.7V-0.05Y, and namely weight percentage is: Al 3%, Mo 5.6%, Cr 7.5%, V 5.7%, Y 0.05%, and surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3Al-5.6Mo-7.5Cr-5.7V-0.05Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 4 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1100 DEG C, the Heating temperature of described upsetting pull forging is 1050 DEG C, the Heating temperature of described one-tenth shape forging is 800 DEG C, the temperature of described solution treatment is 750 DEG C, the soaking time of solution treatment is 2h, the temperature of described Wetted constructures is 570 DEG C, and the soaking time of Wetted constructures is 6h.

The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1186MPa, Rp0.2=1100MPa, A=14%, Z=32%.

Embodiment 7

The nominal composition of the present embodiment yttrium modification TB2 titanium alloy is Ti-3.3Al-5Mo-8.1Cr-5.2V-0.08Y, and namely weight percentage is: Al 3.3%, Mo 5%, Cr 8.1%, V 5.2%, Y 0.08%, and surplus is Ti and inevitable impurity.

The preparation method of the present embodiment yttrium modification TB2 titanium alloy is: prepare burden by nominal composition Ti-3.3Al-5Mo-8.1Cr-5.2V-0.08Y, raw material adopts Al-85V master alloy, Al-60Mo master alloy, Ti-30Mo master alloy, cadmium metal powder, metallic yttrium powder and zero level titanium sponge, electrode is pressed into by after described raw material mixing, then described electrode vacuum consumable electrode arc furnace is obtained the alloy cast ingot of Φ 150mm through three meltings, again described alloy cast ingot is carried out cogging forging on hydrostatic forging machine, 4 fire time repeatedly upsetting pulls forging with become shape forging after obtain yttrium modification TB2 titanium alloy forging, finally by obtaining the yttrium modification TB2 titanium alloy plate that thickness is 60mm after solution treatment and Wetted constructures.The Heating temperature of described cogging forging is 1150 DEG C, the Heating temperature of described upsetting pull forging is 1050 DEG C, the Heating temperature of described one-tenth shape forging is 850 DEG C, the temperature of described solution treatment is 800 DEG C, the soaking time of solution treatment is 1h, the temperature of described Wetted constructures is 560 DEG C, and the soaking time of Wetted constructures is 8h.

The mechanical property of the present embodiment yttrium modification TB2 titanium alloy plate is Rm=1195MPa, Rp0.2=1115MPa, A=13%, Z=31%.

The above; it is only preferred embodiment of the present invention; not any restriction is done to the present invention, every above embodiment is done according to invention technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.

Claims (5)

1. a yttrium modification TB2 titanium alloy, is characterized in that, is grouped into by the one-tenth of following weight percentage: Al 2.5% ~ 3.5%, Mo 4.7% ~ 5.7%, Cr 7.5% ~ 8.5%, V 4.7% ~ 5.7%, Y 0.005% ~ 0.1%, surplus is Ti and inevitable impurity.
2. a kind of yttrium modification TB2 titanium alloy according to claim 1, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3% ~ 3.5%, Mo 5% ~ 5.6%, Cr 7.5% ~ 8.1%, V 5.2% ~ 5.7%, Y 0.05% ~ 0.1%, surplus is Ti and inevitable impurity.
3. a kind of yttrium modification TB2 titanium alloy according to claim 2, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.24%, Mo 5.19%, Cr 8.09%, V5.21%, Y 0.05%, surplus is Ti and inevitable impurity.
4. a kind of yttrium modification TB2 titanium alloy according to claim 2, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.28%, Mo 5.58%, Cr 7.53%, V5.68%, Y 0.09%, surplus is Ti and inevitable impurity.
5. a kind of yttrium modification TB2 titanium alloy according to claim 2, it is characterized in that, be grouped into by the one-tenth of following weight percentage: Al 3.2%, Mo 5.46%, Cr 7.9%, V 5.42%, Y 0.1%, surplus is Ti and inevitable impurity.
CN201410810252.0A 2014-12-22 2014-12-22 Yttrium-modified TB2 titanium alloy CN104404305A (en)

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