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Thermal treatment process for TC4 titanium alloy forging

A titanium alloy, 1.TC4 technology, applied in the field of heat treatment technology, can solve the problems of low strength at room temperature, unqualified high-temperature durability, and many primary α phases, so as to improve the stability of the structure and avoid the aggregation and growth of α phases

Inactive Publication Date: 2017-02-01
WUXI PAIKE HEAVY CASTING & FORGING
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Problems solved by technology

[0003] The applicant improves the above-mentioned shortcomings in the prior art, and provides a heat treatment process for TC4 titanium alloy forgings, which effectively solves the problem of too much primary α phase and poor high-temperature durability in the summary of traditional ordinary annealing heat treatment processes for TC4 titanium alloy forgings. Qualified, room temperature strength is too low

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Embodiment Construction

[0014] Specific embodiments of the present invention will be described below.

[0015] The heat treatment process of TC4 titanium alloy forging of the present invention comprises the following steps:

[0016] In the first step, the size of the TC4 titanium alloy forging is φ1012*φ870*230, the raw material bar is 350 round, and the phase transition point is 1001°C. During the forging and forming process of the TC4 titanium alloy forging, the forging after the TC4 titanium alloy forging is rolled and formed See the light on all sides, leave a margin of 3mm to 4mm on one side;

[0017] The second step, solid solution treatment: air-cool the forgings obtained in the first step and take samples. After sampling, put the forging samples into the furnace. When charging, the furnace is at room temperature, and the heating furnace is heated to 950 ° C. After soaking, keep it warm for 140 minutes , and then cooled in water, the water temperature is room temperature, and the transfer tim...

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Abstract

The invention discloses a thermal treatment process for a TC4 titanium alloy forging. The traditional common annealing treatment process is improved, and the thermal treatment process comprises the steps of carrying out solution treatment at the temperature about 50 DEG C lower than a phase transformation point of the TC4 titanium alloy forging, wherein water cooling is used as a cooling way; after finishing solution treatment, annealing at 760-780 DEG C; and after annealing and air cooling, additionally carrying out aging treatment at 530+ / -10 DEG C for at least 6h. By using the thermal treatment process, the problems of excessive primary alpha phases, unqualified high-temperature durability and excessively-low room-temperature strength in the integration of the traditional common annealing thermal treatment process for the TC4 titanium alloy forging are effectively solved.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology, in particular to the heat treatment technology of TC4 titanium alloy forgings. Background technique [0002] At present, the mainstream heat treatment process of TC4 titanium alloy forgings is ordinary annealing at about 800 °C, and fine-tuning is carried out in this temperature range according to different strength requirements. The phase content accounts for a large proportion after ordinary annealing (reaching 52% to 63% in actual production), so this heat treatment process using ordinary annealing has the following defects: First, the strength of this heat treatment process increases with the decrease of temperature, but The high temperature durability shows a downward trend. After testing, the durability time at 400°C (570MPa) is less than 65h, which cannot meet the standard requirement of not less than 100h; second, the plasticity index after testing exceeds the standard r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 王骏刘智许亮徐慕凡李姚君丁佐军郑卓郜均虎
Owner WUXI PAIKE HEAVY CASTING & FORGING
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