A prediction method of near alpha alpha titanium alloy low-power coarse grain structure distribution

Abstract

The invention relates to a prediction method of near alpha titanium alloy low-power coarse grain structure distribution. The prediction method comprises the following steps of S1 determining the structure of a material under a selected process condition; S2 carrying out statistical analysis on the microscopic structure of the core of the thermal compression test piece under the corresponding process, and carrying out statistical analysis on the grain size; S3 establishing a quantitative prediction model of the original grain size; and S4 on the basis of microscopic structure critical conditionD beta>=D0 formed by the low-power coarse crystals, realizing the visual prediction of near alpha-titanium alloy low-power coarse crystal distribution through secondary development and numerical simulation analysis of finite element software. The prediction method for the macroscopic structure distribution of the near alpha-titanium alloy can effectively reveal the microscopic structure change ofthe near alpha-titanium alloy forge piece after forging heat treatment, and particularly realizes visual prediction of the original grain coarsening and the macroscopic structure distribution causedby the original grain coarsening. The forming process is optimized, the low-power coarse grain area is reduced, and the prediction result is accurate.

Description

technical field [0001] The invention belongs to the technical field of forging titanium alloy forgings, and relates to a method for predicting the distribution of low-magnification coarse-grained structures of near-alpha titanium alloys. Background technique [0002] Due to its good comprehensive performance, titanium alloys are widely used in the aviation field, and are often made into load-bearing components of aircraft by hot die forging. While the demand for titanium alloy die forgings in my country's current aviation industry is increasing rapidly, the requirements for the macro-microstructure and mechanical properties of titanium alloy aviation forgings are also becoming more and more stringent. [0003] The low-magnification microstructure of aviation forgings is one of the important bases for forging quality evaluation and product rejection, and is very sensitive to the deformation history and thermal history of forgings. Especially for large-scale die forgings, due...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for predicting the distribution of low-magnification coarse grains of near-α titanium alloys. Uncontrollable coarse grains, and then a more reasonable deformation process can be formulated according to this method, so that the structure and performance of forgings are more uniform and stable

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