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High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof

A gradient structure, titanium alloy technology, applied in metal rolling and other directions, can solve the problem of low yield strength, achieve high yield strength, good strength and plasticity, and high elongation at break

Active Publication Date: 2021-04-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low yield strength of existing titanium alloys, the present invention provides a high-strength TWIP titanium alloy with gradient structure and its hot rolling method, which can reasonably utilize the suppression of TWIP deformation mechanism by small grains and the effect of large grains on TWIP The facilitation of the deformation mechanism changes the activation of the TWIP deformation mechanism by regulating the heterostructure to increase the yield strength, while improving the strain hardening ability of the alloy and maintaining a high elongation at break

Method used

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  • High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof
  • High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof
  • High-strength TWIP titanium alloy with gradient structure and hot rolling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of hot-rolling method of the high-strength TWIP titanium alloy with gradient structure, comprises the following steps:

[0047] Step 1, the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate is kept at 1000°C for 60min in a muffle furnace, and then quenched to room temperature;

[0048] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 1.5-2.5% Al, 7-8% Mo, 3-4% Cr, 6-7% Zr, and the balance is Ti and Some other unavoidable impurities.

[0049] Step 2, keeping the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate in a muffle furnace at 765°C for 10min;

[0050] Step 3. Take it out and roll it. The reduction in a single pass is 4%. After every two passes of rolling, the sample is returned to the furnace and kept at 765° C. for 1 min. The total rolling reduction is 70%.

[0051] Step 4. Immediately put the rolled sample into a muffle furnace, keep it warm at 780° C. for 5 minutes, and then quench it to room temperature to obtain a h...

Embodiment 2

[0054] A kind of hot-rolling method of the high-strength TWIP titanium alloy with gradient structure, comprises the following steps:

[0055] Step 1, the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate is kept at 1100°C for 90min in a muffle furnace, and then quenched to room temperature;

[0056] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 1.5-2.5% Al, 7-8% Mo, 3-4% Cr, 6-7% Zr, and the balance is Ti and Some other unavoidable impurities.

[0057] Step 2, keeping the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate in a muffle furnace at 790°C for 15min;

[0058] Step 3. Take it out and roll it. The reduction in a single pass is 7%. After every two passes, the sample is returned to the furnace and kept at 765° C. for 2 minutes. The total rolling reduction is 80%.

[0059] Step 4. Immediately put the rolled sample into a muffle furnace, keep it at 790° C. for 7 minutes, and then quench it to room temperature to obtain a high-strength...

Embodiment 3

[0062] A kind of hot-rolling method of the high-strength TWIP titanium alloy with gradient structure, comprises the following steps:

[0063] Step 1, the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate is kept at 1200°C for 120min in a muffle furnace, and then quenched to room temperature;

[0064] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 1.5-2.5% Al, 7-8% Mo, 3-4% Cr, 6-7% Zr, and the balance is Ti and Some other unavoidable impurities.

[0065] Step 2, keeping the 8mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate in a muffle furnace at 815°C for 20min;

[0066] Step 3. Take it out and roll it. The reduction in a single pass is 10%. After every two passes of rolling, the sample is returned to the furnace and kept at 765° C. for 5 minutes. The total rolling reduction is 90%.

[0067] Step 4. Immediately put the rolled sample into a muffle furnace, keep it at 800° C. for 9 minutes, and then quench it to room temperature to obtain a ...

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Abstract

The invention discloses high-strength TWIP titanium alloy with a gradient structure and a hot rolling method of the high-strength TWIP titanium alloy. The method comprises the following steps of carrying out heat preservation on alloy in a beta single-phase region at 1000 DEG C-1200 DEG C in a muffle furnace for 1-2 hours, conducting quenching to enable the temperature to be the room temperature so as to obtain a uniform beta phase, heating the obtained alloy again to enable the temperature to be higher than a phase transformation point, carrying out heat preservation for 10-20 minutes, then conducting rolling operation, carrying out heat preservation on a rolled plate at 780 DEG C-800 DEG C for 5-20 minutes, and conducting quenching to enable the temperature to be the room temperature, so that the single-phase TWIP titanium alloy with the gradient structure is obtained. According to the gradient-structure TWIP titanium alloy manufactured through the method, different strength and plasticity combinations with the yield strength of being 720MPa, the tensile strength of being 801MPa and the elongation at break of being 34.5% and the yield strength of being 900MPa, the tensile strength of being 1100MPa and the elongation at break of being 23.5% can be obtained, and the excellent mechanical property is achieved.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a high-strength TWIP titanium alloy with a gradient structure and a hot rolling method thereof. Background technique [0002] Titanium alloy is known as a modern metal, and its specific strength ranks first among metal materials, and it has been widely used in engineering applications in many fields. Compared with β single-phase and α+β two-phase titanium alloys, metastable β titanium alloys show better hardenability, not only have good matching of plasticity, strength, fatigue resistance and excellent deformation processing performance, but also have relatively High corrosion resistance, so it has attractive application prospects. By adjusting the phase stability of the metastable β-titanium alloy, two deformation mechanisms can occur, TWIP (twin-induced plasticity) and TRIP (transition-induced plasticity), thus presenting unique mechanical properties. Based on this design metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00B21B3/00
Inventor 张金钰张崇乐包翔云刘刚孙军
Owner XI AN JIAOTONG UNIV
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