Making and application methods for atlas of microstructure of titanium alloy

Abstract

The invention specifically relates to making and application methods for the atlas of the microstructure of a titanium alloy, belonging to the technical field of physical metallurgical detection. The making method comprises the following steps: subjecting to-be-detected castings in a casting state and in a hot isostatic pressing state to mechanical property testing; then preparing metallographic samples, carrying out grinding and polishing on the metallographic samples, then observing the metallographic samples with an optical microscope under the condition of magnified times, selecting representative fields of view and shooting the atlas of the microstructure; and classifying pictures of the microstructure according to the characteristics of the microstructure and mechanical testing data and selecting a picture perfectly representing the characteristics of the microstructure as a standard microstructure rating atlas under the condition of the specific characteristics. The applying method comprises the following steps: sampling to-be-detected castings and carrying out mechanical property testing; making statistics of correspondence between microstructure and mechanical testing data; observing the obtained sample with the optical microscope under the condition of magnified times and shooting pictures of the microstructure; and determining whether the casting in the casting state or in the hot isostatic pressing state is qualified according to the standard microporosity atlas. The applying method can effectively rate and evaluate the microstructure of a titanium alloy casting having undergone mechanical property testing.

Description

technical field [0001] The invention belongs to the technical field of physical metallurgy detection, and in particular relates to a method for making and applying a titanium alloy microstructure atlas. Background technique [0002] Titanium alloy has been widely used in aviation, aerospace, and military fields due to its excellent characteristics. It is a promising metal material. The structure of titanium alloy is composed of α phase and β phase. The change range of the quantity ratio of the two phases becomes larger, and the change range of the form and size of the structure becomes wider, and the process performance and service performance of the titanium alloy are determined by the internal structure of the alloy. The geometric shape information such as grain size, shape, distribution position and angle between grains directly determine the mechanical properties and related physical properties of the alloy. [0003] Moreover, in practical applications, especially the a...

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Problems solved by technology

[0003] Moreover, in practical applications, especially the application of titanium alloy castings in the aviation field, it must have qualified safety performance, and in the process of titanium alloy castings, especially after hot isostatic pressing, the metallographic structure of the alloy will occur. Changes make the grain boundary thicker and the intragranular sheet thicker, resulting in a decrease in tensile strength and yield strength, and even make the tensile strength and yield strength of the casting fail to meet the standard requirements, which increases the safety risk during use

[0004] At present, only the mechanical performance test of titanium alloy castings still cannot meet the technical requirements, and the fluorescence penetration evaluation can only be used for non-destructive testing

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