A Heat Treatment Process for Improving Damage Tolerance Performance of Titanium Alloy Forgings

A damage tolerance and titanium alloy technology, which is applied in the field of optimizing the comprehensive performance of titanium alloys, can solve the problems of reducing room temperature tensile plasticity or fatigue strength, achieve low fatigue crack growth rate, improve alloy fracture toughness, and high strength.

Active Publication Date: 2018-08-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lamellar structure has the disadvantage of greatly reducing the tensile plasticity or fatigue strength at room temperature. How to control the microstructure characteristics of the material through the β heat treatment parameters of the high-strength titanium alloy in order to achieve the performance advantages of the lamellar structure and avoid its plasticity. It is of great significance to solve the contradiction between alloy strength, plasticity and toughness.

Method used

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  • A Heat Treatment Process for Improving Damage Tolerance Performance of Titanium Alloy Forgings
  • A Heat Treatment Process for Improving Damage Tolerance Performance of Titanium Alloy Forgings
  • A Heat Treatment Process for Improving Damage Tolerance Performance of Titanium Alloy Forgings

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Embodiment 1

[0023] In this embodiment, the heat treatment process for improving the damage tolerance performance of titanium alloy forgings includes the following steps:

[0024] Step 1, performing solution treatment on the titanium alloy forging obtained by forging below the phase transition temperature; the temperature T of the solution treatment 1 It is 30°C above the phase transition point temperature T of titanium alloy forgings (that is, T 1 =T+30°C), holding time t is 110min, t=(d×0.6+20)min; the titanium alloy forging is a Ti-5553 titanium alloy forging whose phase transition temperature is 850°C, and its cross-sectional diameter d 150mm;

[0025] Step 2. Cool the titanium alloy forging after solution treatment in step 1 to 60°C below its phase transition temperature T (ie T-60°C=790°C) at a cooling rate of 0.5°C / min, and then air-cool to room temperature;

[0026] Step 3: Perform aging treatment on the titanium alloy forging after air-cooling in step 2, and then air-cool to ro...

Embodiment 2

[0031] In this embodiment, the heat treatment process for improving the damage tolerance performance of titanium alloy forgings includes the following steps:

[0032] Step 1, performing solution treatment on the titanium alloy forging obtained by forging below the phase transition temperature; the temperature T of the solution treatment 1 It is 50°C above the phase transition point temperature T of titanium alloy forgings (that is, T 1 =T+50°C), the holding time t is 150min, t=(d×0.6+30)min; the titanium alloy forging is a TB6 titanium alloy forging with a phase transition temperature of 810°C, and its cross-sectional diameter is 200mm;

[0033] Step 2. Cool the titanium alloy forging after the solution treatment in step 1 to 70°C below its transformation point temperature T (ie T-70°C=740°C) at a cooling rate of 0.8°C / min, and then air-cool to room temperature;

[0034] Step 3: Perform aging treatment on the air-cooled titanium alloy forging in step 2, and then air-cool to ...

Embodiment 3

[0039] In this embodiment, the heat treatment process for improving the damage tolerance performance of titanium alloy forgings includes the following steps:

[0040] Step 1, performing solution treatment on the titanium alloy forging obtained by forging below the phase transition temperature; the temperature T of the solution treatment 1 It is 45°C above the phase transition point temperature T of titanium alloy forgings (that is, T 1=T+45°C), holding time t is 158min, t=(d×0.6+26)min; the titanium alloy forging is a Ti-1300 titanium alloy forging whose phase transition temperature is 830°C, and its cross-sectional diameter is 220mm;

[0041] Step 2. Cool the titanium alloy forging after solution treatment in step 1 to 60°C below its phase transition temperature T (ie T-60°C=770°C) at a cooling rate of 1°C / min, and then air-cool to room temperature;

[0042] Step 3: Perform aging treatment on the air-cooled titanium alloy forging in step 2, and then air-cool to room temper...

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Abstract

The invention provides a thermal processing process for improving the damage tolerance performance of a titanium alloy forge piece. The thermal processing process comprises the following steps: (1) carrying out solution treatment on a titanium alloy forge piece forged below a phase transformation point temperature; (2) after the solution treatment, cooling the titanium alloy forge piece to a temperature which is 60-80 DEG C lower than the phase transformation point, and carrying out air cooling until the titanium alloy forge piece reaches a room temperature; and (3) carrying out ageing treatment on the air-cooled titanium alloy forge piece, and carrying out air cooling until the titanium alloy forge piece reaches a room temperature. By utilizing the titanium alloy forge piece, with an initial microscopic structure containing an equiaxed structure, a basket-weave structure or a duplex structure, forged below the phase transformation point temperature, as a thermal processing object, the thermally processed titanium alloy forge piece has a relatively high strength and good plasticity and tenacity and simultaneously has relatively low fatigue crack extending rate, so that the limitation that the strength, plasticity and damage tolerance performance of titanium alloy which is subjected to traditional solution treatment-ageing treatment or solution furnace cooling treatment are difficult to be well matched is broken through.

Description

technical field [0001] The invention belongs to the technical field of optimizing the comprehensive performance of titanium alloys, and in particular relates to a heat treatment process for improving the damage tolerance performance of titanium alloy forgings. Background technique [0002] As a new type of light metal material that has developed rapidly in recent decades, titanium alloy has excellent comprehensive performance matching such as strength, modulus, toughness, high damage tolerance and weldability, so it has become the main structural material of advanced aircraft and aero-engines. With the improvement of people's requirements for aircraft and the change of aircraft design concept, not only the strength level of titanium alloy is required to be continuously improved, but also the toughness of titanium alloy is also put forward higher requirements, that is, while effectively improving the strength of titanium alloy, it is required Its toughness should also be main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 周伟赵永庆辛社伟葛鹏李倩张思远陈军
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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