A kind of preparation method of high temperature, high thermal stability, high creep resistance titanium alloy bar

A high thermal stability, titanium alloy technology, applied in the field of titanium-based alloys, can solve the problems affecting the uniformity of the forging structure and the stability of mechanical properties, the uniformity of the bar structure cannot be guaranteed, and the deformation resistance is large, so as to avoid uneven deformation. , to avoid technical risks, the effect of good creep performance

Active Publication Date: 2020-12-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high deformation resistance of Ti55 high-temperature titanium alloy, the deformation is prone to surface cracking, and 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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  • A kind of preparation method of high temperature, high thermal stability, high creep resistance titanium alloy bar
  • A kind of preparation method of high temperature, high thermal stability, high creep resistance titanium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Ingot smelting: Al-Mo, Ti-Sn, Al-Si, Al-Nb and Al-Ta master 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 electric arc furnace smelting, a Ti55 titanium alloy ingot with a diameter of 710mm was obtained; the weight percentage of each component of the Ti titanium alloy ingot is Al: 5.51%, Sn: 3.55%, Zr: 3.10% , Mo: 1.01%, Si: 0.28%, Nb: 0.42%, Ta: 0.51%, H: 0.009%, O: 0.12%, N: 0.013%, the balance is Ti, the phase transition temperature T of the ingot β 1000°C

[0023] 2) Using a resistance furnace, heat the Ti60 titanium alloy ingot obtained in step 1) to 1200°C, and then repeatedly upsetting and elongating the forging with a hydraulic press for 2 times. Not less than 4, the final forging temperature is not lower than 850°C;

[0024] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1100°C, and then repea...

Embodiment 2

[0029] 1) ingot smelting: the preparation method of ingot is the same as embodiment 1, and difference is that the diameter of Ti55 titanium alloy ingot is 540mm, and the phase transition temperature T of ingot is β is 994°C;

[0030] 2) Using a resistance furnace, heat the Ti55 titanium alloy ingot obtained in step 1) to 1150°C, and then repeatedly upsetting and elongating the forging with a hydraulic press for 2 times. Not less than 4, the final forging temperature is not lower than 850°C;

[0031] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1100°C, and then repeatedly upsetting and elongating the forging billet with a hydraulic press for 3 times. The forging ratio of each billet is not less than 2.6, and the total forging ratio is not less than 6 , the final forging temperature is not lower than 850°C; the forging billet is cooled by water cooling after the last forging is completed;

[0032] 4) Using a resistance furnace, heat the forged ...

Embodiment 3

[0036] 1) ingot smelting: the preparation method of ingot is the same as embodiment 1, and difference is that the diameter of Ti55 titanium alloy ingot is 380mm, and the phase transition temperature T of ingot is β is 996°C;

[0037] 2) Using a resistance furnace, heat the Ti55 titanium alloy ingot obtained in step 1) to 1150°C, and then repeatedly upsetting and elongating the forging with a hydraulic press for 2 times. Not less than 4, the final forging temperature is not lower than 850°C;

[0038] 3) Using a resistance furnace, heat the forging blank obtained in step 2) to 1080°C, then repeatedly upsetting and elongating the forging with a hydraulic press for 3 times, the forging ratio of the forging blank per firing is not less than 2.6, and the total forging ratio is not less than 6 , the final forging temperature is not lower than 850°C; the forging billet is cooled by water cooling after the last forging is completed;

[0039] 4) Using a resistance furnace, heat the fo...

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Abstract

The invention belongs to the field of titanium-based alloy and particularly relates to a preparation method for a high-temperature titanium alloy bar. The preparation method comprises the steps that aprepared Ti55 titanium alloy cast ingot is heated to 1150 DEG C-1200 DEG C, and then cogging forging is conducted in a beta phase region through a fast forging machine or a hydraulic press; and thenthe Ti55 titanium alloy cast ingot is heated to 1050 DEG C-1100 DEG C, upsetting and drawing-out forging are conducted repeatedly through the fast forging machine or the hydraulic press, then the forged blank is heated to Tbeta-100 DEG C-Tbeta-20 DEG C (Tbeta is Ti55 titanium alloy alpha+beta / beta phase transformation temperature), upsetting and drawing-out forging are conducted repeatedly throughthe fast forging machine or the hydraulic press till the needed size is obtained, and the titanium alloy bar of which the macrostructure is fuzzy crystals and the microstructure is uniform is obtained. After subjected to solution+aging heat treatment, the Ti55 titanium alloy bar prepared through the preparation method is good in strength and toughness match, good in endurance and creep strength and heat stability match, and high in fracture toughness. Operation is convenient, process controllability is high, and the prepared Ti55 titanium alloy bar is good in 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 rod used for a long time (≥50 hours) at 550°C to 600°C and for a short time (<10 hours) at 650°C to 700°C Preparation. Background technique [0002] Titanium alloy has the advantages of high specific strength, corrosion resistance and heat resistance, and has been widely used in aviation, aerospace, petroleum, chemical industry, energy, automobile, medical treatment, sports and leisure and other fields. With the development of aviation and aerospace technology, especially when the flight Mach number of the aircraft reaches more than 3.0, the traditional aluminum-based alloys and titanium alloys (TC4) can no longer meet the high-temperature resistance requirements of aircraft forgings and shells, and there is an urgent need to use temperature Lightweight high temperature resistant titanium alloy used in the range of 600°C to 70...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C1/03C22C14/00
CPCC22C1/03C22C14/00C22F1/183
Inventor 王清江高颀刘建荣王鼎春陈志勇王磊陈战乾朱绍祥李渭清石卫民赵子博
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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