Heat treatment process of titanium alloy

A titanium alloy and process technology, which is applied in the field of heat treatment of titanium alloys to achieve the effect of excellent fatigue performance

Active Publication Date: 2019-09-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to design and provide a new heat treatment process for titanium alloys aimed at the limitations of existing metastable β-type, near-β-type

Method used

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  • Heat treatment process of titanium alloy
  • Heat treatment process of titanium alloy
  • Heat treatment process of titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0027] This embodiment is heat treatment of a nearly β-type TB17 titanium alloy free forging with an effective thickness of 100mm.

[0028] The specific heat treatment process is as follows:

[0029] (1) The first heavy heat treatment. Put the titanium alloy forging into the effective working area of ​​the resistance furnace that has reached the set heating temperature T for heating. The set heating temperature T is the phase transition point (T β ) below 25°C, the resistance furnace reaches the set heating temperature T again and starts to calculate the holding time. The holding time is t=120min.

[0030] (2) Second heat treatment. Put the titanium alloy forging into the effective working area of ​​the resistance furnace that has reached the set heating temperature T for heating. The set heating temperature T is 680°C. Time t=30min, after the heat preservation is over, the forgings are taken out of the furnace and cooled to room temperature in air.

[0031] (3) The third ...

Embodiment 2

[0036] This embodiment is heat treatment of a nearly β-type TB17 titanium alloy free forging with an effective thickness of 200mm.

[0037] The specific heat treatment process is as follows:

[0038] (1) The first heavy heat treatment. Put the titanium alloy forging into the effective working area of ​​the resistance furnace that has reached the set heating temperature T for heating. The set heating temperature T is the phase transition point (T β ) below 20°C, the resistance furnace reaches the set heating temperature T again and starts to calculate the holding time. The holding time is t=150min.

[0039] (2) Second heat treatment. Put the titanium alloy forging into the effective working area of ​​the resistance furnace that has reached the set heating temperature T for heating. The set heating temperature T is 700°C. Time t = 55min. After the heat preservation is over, the forgings are taken out of the furnace and cooled to room temperature in air.

[0040] (3) The thir...

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Abstract

The invention discloses a heat treatment process of a titanium alloy, and belongs to the technical field of material science. The heat treatment process is mainly as follows: the heating temperature T of the first heating treatment is greater than or equal to (Tbeta-50) DEG C and less than or equal to (Tbeta+60) DEG C, the holding time t is equal to eta 1*delta max, the delta max is the maximum section thickness of a titanium alloy forged piece, the eta 1 is a heating coefficient, the value of the heating coefficient is 0.6-1.5min/mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from a furnace and is subjected to air cooling, wind cooling, oil cooling or water cooling to a room temperature; the heating temperature T of the second heating treatment is greater than or equal to 650 DEG C and less than 780 DEG C, the holding time t is equal to (eta 2*delta max)/2, the delta max is the maximum section thickness of the titanium alloy forged piece, the eta 2 is a heating coefficient, the value of the heating coefficient is 0.3-1.2min/mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature; and the heating temperature T of the third heating treatment is greater than or equal to 480 DEG C and less than 650 DEG C, the holding time t is greater than or equal to 240min and less than or equal to 600min, and after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature. The heat treatment process solves the problems that after near-beta, metastable beta-type and fully-stable beta-type titanium alloys are subjected to solution treatment and ageing, the side and heart of the forged piece have large difference in structure properties, and is particularly suitable for preparing the high-strength titanium alloy forged piece with uniform structure properties and a large section/variable cross section.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a heat treatment process for titanium alloys. Background technique [0002] Titanium and titanium alloys have excellent characteristics such as high specific strength, high temperature resistance, corrosion resistance, and weldability, and are widely used in aerospace, chemical, marine and other modern industries and national defense fields, especially in the aviation field. Part weight or projected area has become one of the important symbols to measure the advanced nature of aircraft. [0003] In response to the urgent need for weight reduction of a new generation of advanced aircraft, more specific requirements have been put forward for the strength and comprehensive performance of titanium alloy materials. The development of high-strength or ultra-high-strength titanium alloy materials and application technologies has become a popular choice among material researchers a...

Claims

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Application Information

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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 李明兵朱知寿王新南商国强祝力伟李静刘格辰
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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