Heat treatment process for obtaining basket structure after superplastic deformation in two-phase region of tc21 alloy
A technology of mesh basket structure and superplasticity is applied in the field of heat treatment technology, which can solve the problems of difficulty in obtaining mesh basket structure and achieve the effect of excellent damage tolerance.
Inactive Publication Date: 2016-12-07
NANCHANG HANGKONG UNIVERSITY
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[0007] The invention provides a heat treatment process for obtaining the basket structure after superplastic deformation in the two-phase region of TC21 alloy, so as to solve the problem that it is difficult to obtain the basket structure after superplastic deformation in the two-phase region of TC21
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[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
[0031] In the present invention, the TC21 tensile sample first passes through 900°C, 3.3 × l 0 -4 / s for superplastic stretching, and take out the water cooling immediately after the tensile sample is broken.
[0032] Then, triple heat treatment is performed on the evenly deformed tensile sample after breaking. The triple heat treatment is composed of three times of heating, three times of heat preservation and three times of air cooling. The first heat treatment is selected as a solid solution in the β phase region, the purpose is to completely change the stretched structure of TC21, so that it becomes a β phase and a β transformation structure, so the temperature of the first heat treatment is taken in the quasi-β phase region...
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Abstract
The invention provides a heat treatment process for allowing a TC21 alloy to obtain a basket-weave microstructure after superplastic deformation in a two-phase region. The heat treatment process includes the steps: firstly carrying out superplastic tensile of a TC21 tensile specimen at the temperature of 900 DEG C and a set strain rate until tensile failure; after tensile failure of the tensile specimen, immediately carrying out water cooling; cutting out a uniform-deformation part of the tensile-failure specimen to be used as a heat treatment specimen; carrying out first heat treatment on the heat treatment specimen, heating a heat treatment furnace up to 10-20 DEG C above a beta-phase transition temperature, putting the heat treatment specimen into the heat treatment furnace, carrying out heat preservation for 1 hour, and followed by carrying out first air cooling; then, carrying out second heat treatment on the heat treatment specimen, heating the heat treatment furnace up to 20-30 DEG C below the beta-phase transition temperature, putting the heat treatment specimen into the heat treatment furnace, carrying out heat preservation for 1 hour, and followed by carrying out second air cooling; and then, carrying out third heat treatment on the heat treatment specimen, heating the heat treatment furnace up to 360-370 DEG C below the beta-phase transition temperature, putting the heat treatment specimen into the heat treatment furnace, carrying out heat preservation for 4 hours, followed by carrying out third air cooling, and thus obtaining the basket-weave microstructure.
Description
technical field [0001] The invention relates to a heat treatment process for obtaining a basket structure after superplastic deformation of the two-phase region of TC21 alloy. Background technique [0002] With the continuous development of aerospace technology, advanced aircraft put forward more stringent requirements for the use of aviation components, which must not only meet the requirements of large size, high performance, and high weight reduction of new aircraft, but also meet the requirements of long life and Due to low-cost design and application requirements, the concept of "damage tolerance design" has become the mainstream concept of modern aircraft design. The damage tolerance design is based on the theory of fracture mechanics, and it is a design method to ensure the safe use of components containing cracks during the service period through slow crack growth or damage safety. TC21 titanium alloy is a high-strength damage-tolerant titanium alloy, which has exce...
Claims
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IPC IPC(8): C22F1/18
Inventor 董洪波朱深亮
Owner NANCHANG HANGKONG UNIVERSITY