Heat treatment technique for obtaining tristate tissue by carrying out two-phase-region high temperature deformation on TC4-DT titanium alloy

Abstract

The invention discloses a heat treatment technique for obtaining a tristate tissue by carrying out two-phase-region high temperature deformation on a TC4-DT titanium alloy. The heat treatment technique is characterized by comprising the following steps: firstly carrying out two-phase region temperature and 1.1*10<-3> / s plastic stretching on TC4-DT, immediately taking the sample out after the sample is broken and quenching the sample with water; then carrying out triple heat treatment on a deformation part of the sample, wherein the triple heat treatment comprises three times of heating, three times of heat preservation, twice water quenching and once air cooling. By adopting the heat treatment technique disclosed by the invention, the tristate tissue can be obtained, and the tristate tissue has good comprehensive mechanical properties.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a TC4-DT titanium alloy heat treatment method. Background technique [0002] In order to expand the amount of titanium used in the aviation sector and further improve the stability and safety of aircraft, it is necessary to conduct in-depth research on the properties of titanium alloys. TC4-DT titanium alloy is a material with independent intellectual property rights developed on the basis of TC4 titanium alloy by Northwest Nonferrous Metals Research Institute and Beijing Aeronautical Materials Research Institute, which meets the design requirements of structural integrity damage tolerance. Limited-type titanium alloys have been widely used in the aerospace field. It is of great significance to study the influence of heat treatment process on microstructure and mechanical properties of TC4-DT titanium alloy for the correct characterization, evaluation and application of TC4-DT titanium...

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Problems solved by technology

This double-lamellar structure effectively reduces the fatigue growth rate at the initial stage, but when it reaches a certain range, it is basically the same as the fatigue growth rate of the general lamellar structure, and because the primary temperature is in the β-phase region, it does not retain a certain The equiaxed structure with high content often loses plasticity while improving the damage tolerance performance, and it is difficult to satisfy the matching of plasticity and strength-toughness.

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