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Preparation method of high-temperature titanium alloy bar

A high-temperature titanium alloy and titanium alloy technology, applied in the field of titanium-based alloys, can solve the problems affecting the uniformity of the bar 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 unevenness. Deformation, avoidance of technical risks, good effect of creep performance

Active Publication Date: 2019-01-18
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

Due to the high deformation resistance of Ti60 high-temperature titanium alloy, and the deformation is prone to surface cracking, the uniformity of the structure of the Ti60 titanium alloy rod cannot be guaranteed, which seriously affects the uniformity of the structure and the stability of the mechanical properties of the rod.

Method used

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  • Preparation method of high-temperature titanium alloy bar
  • Preparation method of high-temperature titanium alloy bar
  • Preparation method of high-temperature titanium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Ingot smelting: Al-Mo, Ti-Sn, Al-Si, Al-Nb and Al-Ta master alloys, sponge Zr, pure Al and carbon powder are made into alloy bags, and then pressed with 0-grade sponge titanium Electrode, after vacuum plasma welding and three vacuum consumable electric arc furnace smelting, to obtain a Ti60 titanium alloy ingot with a diameter of 710mm; the weight percentage of each component of the Ti60 titanium alloy ingot is Al: 5.61%, Sn: 3.85%, Zr : 3.20%, Mo: 0.91%, Si: 0.34%, Nb: 0.42%, Ta: 1.21%, C: 0.05%, H: 0.009%, O: 0.12%, N: 0.012%, the balance is Ti, cast Ingot phase transition temperature T β 1060°C

[0025] 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 lower than 900°C;

[0026] 3) Using a resistance furnace, heat the forging billet obtained in step 2) to 1100°C, and then repeatedly upsetting and elongating the forging ...

Embodiment 2

[0031] 1) ingot smelting: the preparation method of ingot is identical with embodiment 1, and difference is that the diameter of Ti60 titanium alloy ingot is 620mm, and the phase transition temperature T of ingot is β is 1054°C;

[0032] 2) Using a resistance furnace, heat the Ti60 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 lower than 900°C;

[0033]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 900°C; the forging billet is cooled by water cooling after the last forging.

[0034] 4) Using a resistance furnace, heat the forged blank obtained in step 3) to T β -60°C (994°C), then repeat...

Embodiment 3

[0038] 1) ingot smelting: the preparation method of ingot is identical with embodiment 1, and difference is that the diameter of Ti60 titanium alloy ingot is 380mm, and the phase transition temperature T of ingot is β is 1056°C;

[0039] 2) Using a resistance furnace, heat the Ti60 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 lower than 900°C;

[0040] 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 900°C; the forging billet is cooled by water cooling after the last forging.

[0041] 4) Using a resistance furnace, heat the forged blank obtained in step 3) to T β -80°C (976°C), then ...

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Abstract

The invention belongs to the field of titanium-base alloys and particularly relates to a preparation method of a high-temperature titanium alloy bar. The preparation method comprises the following steps: heating a prepared Ti60 titanium alloy cast ingot to 1150-1200 DEG C, and carrying out blank-opening forging in a beta phase region by virtue of a rapid forging machine or a hydraulic press; heating to 1080-1150 DEG C, carrying out repeated upsetting and swaging forging by virtue of the rapid forging machine or the hydraulic press, heating the forged blank to Tbeta-120 DEG C to Tbeta-30 DEG C(Tbeta is a Ti60 titanium alloy alpha+beta / beta phase inversion temperature), and carrying out repeated upsetting and swaging forging by virtue of the rapid forging machine or the hydraulic press until the blank is in a required size, so as to obtain the titanium alloy bar, wherein the macrostructure of the titanium alloy bar is a fuzzy crystal, and the microstructure of the titanium alloy bar isuniform. After the prepared Ti60 titanium alloy bar is subjected to solid dissolving and ageing thermal treatment, the matching degree of the obdurability of the bar is relatively good, and the matching degrees of the durability, creeping strength and thermal stability are relatively good. The preparation method is convenient in operation and relatively strong in process controllability, and the batch stability of the prepared Ti60 titanium alloy bars is good.

Description

technical field [0001] The invention belongs to the field of titanium-based alloys, and specifically relates to a new type of high-temperature titanium alloy (Ti60) that can be used for a long time (≥50 hours) at 600°C to 650°C and for a short time (<10 hours) at 650°C to 750°C. ) method for the preparation of rods. 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 for high temperature Lightweight high temperature res...

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 王清江高颀赵子博王鼎春刘建荣王磊陈战乾李渭清陈志勇陈秉刚朱绍祥郭佳林
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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