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Preparation method of high-temperature, high-thermal stability and high-fracture toughness titanium alloy bar material

A high thermal stability, titanium alloy technology, applied in the field of titanium-based alloys, can solve problems that affect the uniformity of forgings and the stability of mechanical properties, high content of stable elements, and difficulty in breaking or refining, so as to avoid uneven deformation And forging cracking, refining the original β grains, and avoiding the effect of rapid growth

Active Publication Date: 2019-01-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the TC25G titanium alloy is an α+β two-phase titanium alloy with a high content of β stable elements, it is difficult to break or refine the original β grains, and the bar often has clear crystals or semi-clear crystals that do not meet the standard requirements. At the same time, high-temperature forging During the process, the deformation resistance of TC25G increases rapidly with the decrease of temperature, and the deformation resistance of high-temperature titanium alloy increases. The uniformity of the structure of the bar cannot be guaranteed, which seriously affects the uniformity of the structure and the stability of the mechanical properties of the forging.

Method used

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  • Preparation method of high-temperature, high-thermal stability and high-fracture toughness titanium alloy bar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Ingot smelting: Al-Mo, Ti-Sn, Al-Si, Al-Mo-W-Ti intermediate alloys, sponge Zr, pure Al, etc. are made into alloy bags, and then pressed with 0-grade sponge titanium to form electrodes. After vacuum plasma welding and three vacuum consumable arc furnace smelting, a TC25G titanium alloy ingot with a diameter of 710mm was obtained; the weight percentage of each component of the Ti titanium alloy ingot is Al: 6.61%, Sn: 1.85%, Zr: 3.60% , Mo: 4.10%, Si: 0.23%, W: 1.0%, H: 0.009%, O: 0.10%, N: 0.010%, the balance is Ti, the phase transition temperature T of the ingot β 990°C

[0022] 2) Using a resistance furnace, heat the TC25G titanium alloy ingot obtained in step 1) to 1150°C, then repeatedly upsetting and elongating the forging with a hydraulic press for 2 fires. Not less than 4.2, the final forging temperature is not lower than 900°C;

[0023] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1100°C, then repeatedly upsetting and elonga...

Embodiment 2

[0028] 1) ingot smelting: the preparation method of the ingot is the same as in Example 1, the difference is that the diameter of the TC25G titanium alloy ingot is 540mm, and the phase transition temperature T of the ingot is β is 984°C;

[0029] 2) Using a resistance furnace, heat the TC25G titanium alloy ingot obtained in step 1) to 1150°C, and then repeatedly upsetting and elongating the forging with a hydraulic press for 2 fires. Not less than 4.2, the final forging temperature is not lower than 900°C;

[0030] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1030°C, then repeatedly upsetting and elongating forging with a hydraulic press for 3 times, the forging ratio of the forging billet for each firing is not less than 2.6, and the total forging ratio is not less than 6.5 , the final forging temperature is not lower than 850°C;

[0031] 4) Using a resistance furnace, heat the forged blank obtained in step 3) to T β -40°C (944°C), using a ...

Embodiment 3

[0035] 1) ingot smelting: the preparation method of the ingot is the same as in Example 1, the difference is that the diameter of the TC25G titanium alloy ingot is 380mm, and the phase transition temperature T of the ingot is β is 986°C;

[0036] 2) Using a resistance furnace, heat the TC25G titanium alloy ingot obtained in step 1) to 1150°C, and then repeatedly upsetting and elongating the forging with a hydraulic press for 2 fires. Not less than 4.2, the final forging temperature is not lower than 900°C;

[0037] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1080°C, then repeatedly upsetting and elongating forging with a hydraulic press for 3 times, the forging ratio of the forging billet for each firing is not less than 2.6, and the total forging ratio is not less than 6.5 , the final forging temperature is not lower than 850°C;

[0038] 4) Using a resistance furnace, heat the forged blank obtained in step 3) to T β -50°C (936°C), using a ...

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Abstract

The invention belongs to the field of titanium-based alloys, and specifically relates to a preparation method of a high-temperature titanium alloy bar material, wherein the preparation method includesthe steps: heating a prepared TC25G titanium alloy ingot to 1100 DEG C-1200 DEG C, and then cogging and forging in a beta phase region by a fast forging machine or a hydraulic press; heating to 1030DEG C-1100 DEG C, repeatedly carrying out upsetting and drawing-out forging by the fast forging machine or the hydraulic press, then heating the forged blank to T[beta]-110 DEG C-T[beta]-20 DEG C (T[beta] is a [alpha]+[beta] / [beta] phase transition temperature of an TC25G titanium alloy), and repeatedly carrying out upsetting and drawing-out forging by the fast forging machine or the hydraulic press; and finally, heating the forged blank after forging to T[beta]-110 DEG C-T[beta]-30 DEG C, and drawing out to the required size by the fast forging machine or the hydraulic press, to obtain the titanium alloy bar material with a low-power structure of blurred crystals and a uniform high-power structure. The prepared TC25G titanium alloy bar material has high tensile strength of the bar material at room temperature and high temperature, good thermal stability and high fracture toughness after double heat treatment. The preparation method has the advantages of convenient operation and strongprocess controllability, and the prepared TC25G titanium alloy bar material has good batch stability.

Description

technical field [0001] The invention belongs to the field of titanium-based alloys, and in particular relates to a high-temperature titanium alloy bar that can be used for a long time (≥100 hours) at 500°C to 550°C and for a short time (<10 hours) at 550°C to 650°C. Preparation. Background technique [0002] In the 1970s, the United States successfully developed the nearly α-type Ti-6242S alloy, and its service temperature reached 540 ° C. This alloy has high strength and stiffness, good creep resistance and thermal stability, and is widely used in the production of High-pressure compressor disks for large transport aircraft gas turbine engines. The high-temperature titanium alloy IMI829 developed in the United Kingdom has a service temperature of 550°C. The rear 3-stage disc, drum and rear axle of the high-pressure compressor of the RB211-535E4 engine made of IMI829 titanium alloy are welded into one structure, which has been used on the Boeing 757 passenger plane Get ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C14/00C22F1/18
CPCC22C1/03C22C14/00C22F1/183
Inventor 王清江刘继雄赵子博王磊张平辉王立瑛刘建荣陈志勇毛玲玲王永强朱绍祥张伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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