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Double-phase high-strength high-plasticity titanium alloy with layered structure and preparation method of double-phase high-strength high-plasticity titanium alloy

A layered structure, titanium alloy technology, applied in the field of metal materials, can solve problems such as changing the stability of the β matrix, hindering the development of metastable β titanium alloys, and the yield strength of TRIP titanium alloys has not achieved practical breakthroughs.

Inactive Publication Date: 2022-01-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precipitation of the α phase is often accompanied by the redistribution of elements, which will change the stability of the β matrix
In addition, the uniformly precipitated α phase is difficult to significantly refine the β grains. When the β matrix is ​​stable, the deformation mechanism will be transformed into dislocation slip, and the elongation and work hardening rate will decrease significantly.
Therefore, the yield strength of TRIP titanium alloys has not been practically broken through, which seriously hinders the further development of metastable β titanium alloys.

Method used

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preparation example Construction

[0036] A method for preparing a two-phase high-strength and high-plasticity TRIP titanium alloy with a layered structure, comprising the following steps:

[0037] Step 1. Heat the titanium alloy in the β single-phase region at 1000-1100°C in a muffle furnace for 1-2 hours, and then quench it to room temperature to obtain a uniform β-phase;

[0038] Step 2, the alloy obtained in step 1 is heated up to a temperature above the transformation point again, and rolled after being kept warm for 10-20min.

[0039] The temperature of the phase transition point is 765±5°C, the heating temperature is from the phase transition point temperature to 10°C above the phase transition point temperature, and the heating temperature is 770-780°C.

[0040] Step 3. The titanium alloy obtained in step 2 is rolled across β, and the rolling reduction in a single pass is 3 to 5% of the rolling deformation. After each 1 to 2 passes of rolling, the temperature is lower than the phase transition point tem...

Embodiment 1

[0053] A method for preparing a two-phase high-strength and high-plasticity TRIP titanium alloy with a layered structure, comprising the following steps:

[0054] Step 1. Heat the 10mm thick Ti-Al-Mo-Cr-Zr metastable β-titanium alloy plate in a muffle furnace at 1000°C for 60 minutes, and then quench it to room temperature;

[0055] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 0.5-1.5% Al, 8-9% Mo, 2.5-4% Cr, 3-4% Zr, and the balance is Ti and Some other unavoidable impurities.

[0056] Step 2, heat the 10mm thick Ti-Al-Mo-Cr-Zr metastable alloy plate at 770°C for 10min in a muffle furnace;

[0057] Step 3. Take it out and roll it. The reduction in a single pass is 3%. After each pass, the sample is returned to the furnace and kept at 770° C. for 1 min. The total rolling reduction is 85%.

[0058] Step 4. Immediately put the rolled sample into a muffle furnace, keep it at 770° C. for 1 min, and then quench it to room temperature to obtain a layered struct...

Embodiment 2

[0061] A method for preparing a layered two-phase high-strength high-plasticity TRIP / TWIP titanium alloy, comprising the following steps:

[0062] Step 1. Heat the 10mm thick Ti-Al-Mo-Cr-Zr metastable β-titanium alloy plate in a muffle furnace at 1000°C for 60 minutes, and then quench it to room temperature;

[0063] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 0.5-1.5% Al, 8-9% Mo, 2.5-4% Cr, 3-4% Zr, and the balance is Ti and Some other unavoidable impurities.

[0064] Step 2, keeping the 10mm thick Ti-Al-Mo-Cr-Zr metastable β titanium alloy plate in a muffle furnace at 770°C for 10min;

[0065] Step 3. Take it out and roll it. The reduction in a single pass is 3%. After each pass, the sample is returned to the furnace and kept at 770° C. for 1 min. The total rolling reduction is 90%.

[0066] Step 4. Immediately put the rolled sample into the muffle furnace, hold it at 770°C for 1min, and then quench it to room temperature to obtain a high-strength and...

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Abstract

The invention discloses a double-phase high-strength high-plasticity titanium alloy with a layered structure and a preparation method of the double-phase high-strength high-plasticity titanium alloy. According to the method, an alloy is subjected to heat preservation for 1 h to 2 h in a beta single-phase region at a temperature of 1000 DEG C to 1100 DEG C in a muffle furnace and then quenched to a room temperature so as to obtain a uniform beta phase, the obtained alloy is heated again to a temperature above a phase transformation point, heat preservation is conducted for 10 min to 20 min, then rolling is conducted, and finally, a plate obtained through rolling is subjected to heat preservation for 1 min to 2 min at a temperature 5 DEG C to 10 DEG C higher than the phase transformation point and then quenched to the room temperature, so as to obtain a double-phase TRIP titanium alloy with the layered structure. According to the double-phase TRIP titanium alloy with the layered structure prepared through the method, optimal performance can be achieved, which is a mechanical performance combination of yield strength of 875 MPa and an elongation at break of 36%, the yield strength of the titanium alloy is twice as high as yield strength of a conventional TRIP metastable-state beta titanium alloy, plasticity is hardly lost, and based on the characteristics, the alloy has great competitive advantages in the TRIP metastable-state beta titanium alloy.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a two-phase high-strength and high-plasticity titanium alloy with a layered structure and a preparation method thereof. Background technique [0002] In the high-tech industry, as structural materials face increasingly harsh service environments, high-strength materials with excellent ductility have always been the goal pursued by material scientists. Titanium alloy has the characteristics of high specific strength, high corrosion resistance, non-magnetism and excellent strong-plastic matching, and has been widely used in chemical industry, medical equipment, navigation, aerospace and other fields. [0003] Benefiting from excellent formability and corrosion resistance, stainless steel or Co-Cr alloys are widely used in complex pipelines and structural parts in petrochemical pipelines, navigation and other fields, but their yield strength is very low (about 200-300MPa ), failure a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22F1/183C22F1/002C22C14/00
Inventor 张金钰张崇乐张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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