Heat treatment method of thin-wall damage tolerance type TC4-DT titanium alloy part

Abstract

The invention discloses a heat treatment method of a thin-wall damage tolerance type TC4-DT titanium alloy part. The method comprises the following steps: 1) before machining, carrying out primary annealing heat treatment on the thin-wall damage tolerance type TC4-DT titanium alloy part, and then machining the thin-wall damage tolerance type TC4-DT titanium alloy part to enable the thin-wall damage tolerance type TC4-DT titanium alloy part to be in a semi-finish machining state; 2) putting the thin-wall damage tolerance type TC4-DT titanium alloy part in the the semi-finish machining state into a vacuum welding furnace for 1-2h for primary vacuum electron beam welding; 3) then putting the part into a semi-finish machining heat treatment tool, putting the tool into an annealing furnace forvacuum heat treatment, and carrying out primary vacuum heat treatment; 4) taking out the part, machining the part to enable the part to be in a finish machining state, and then putting the part into afinish machining heat treatment tool; 5) carrying out secondary vacuum heat treatment through the annealing furance for vacuum heat treatment. According to the method, the problem of stress deformation of the thin-wall damage tolerance type TC4-DT titanium alloy part during cutting machining is effectively solved, the machining size is stabilized, and it is guaranteed that the dimensional tolerance and the geometric tolerance of the part meet the technical requirements.

Description

technical field [0001] The invention relates to the technical field of processing and treatment of titanium alloy parts, in particular to a heat treatment method for thin-wall damage tolerance type TC4-DT titanium alloy parts. Background technique [0002] Thin-walled damage-tolerant TC4-DT titanium alloy parts are more and more widely used in aerospace manufacturing and are the most common. However, there are many difficulties in the processing of parts. The main manifestations are: the tissue is prone to fission at high temperature, and under high temperature and high pressure, it is easy to produce sticking phenomenon during cutting, forming built-up edge; it is easy to deform during cutting, which affects the size of the part. Tolerance and geometric tolerance; residual stress after cutting is large, resulting in size and shape tolerances out of tolerance, making parts scrapped; poor dimensional stability, the residual stress retained in the material will be released whe...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a thin-walled damage-tolerant TC4-DT titanium alloy part that effectively solves the stress deformation problem in cutting processing, not only stabilizes the processing size, but also ensures that the dimensional tolerance and geometric tolerance of the part meet the technical requirements. Heat Treatment Method for Parts of Wall Damage Tolerant Titanium Alloy TC4-DT

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