Prediction method for microstructure evolution law of 20CrMnTiH steel in thermal deformation process

Abstract

The invention discloses a prediction method for a microstructure evolution law of 20CrMnTiH steel in a thermal deformation process. According to the method, a Deform-3D based secondary development microstructure simulation module is combined with the thermal deformation process; a mathematic model of a microstructure evolution mechanism of the 20CrMnTiH steel is obtained by a physical experiment; dynamic recrystallization, static recrystallization, meta dynamic recrystallization and austenite grain growth microstructure analysis and simulation modules for a material are compiled by adopting an Absoft Pro Fortran language; and microstructure distribution of a thermal deformation workpiece in different process conditions is calculated by calling the microstructure modules, and macroscopic field quantity such as a temperature field, an equivalent stress-strain field and a microstructure mutual influence law in the thermal deformation process is analyzed to realize prediction of the microstructure distribution and evolution law of the 20CrMnTiH steel in the thermal deformation process, thereby providing technical bases for setting and optimizing thermoforming process parameters of 20CrMnTiH steel products in actual production, and providing theoretic bases for obtaining high mechanical performance of the material by controlling deformation conditions in a thermal precision forming process.

Description

technical field [0001] The invention relates to the technical field of computer simulation, in particular to a method for predicting the microstructure evolution rule in the thermal deformation process of 20CrMnTiH steel. Background technique [0002] The thermal deformation forming of metal materials has the characteristics of small yield stress and good plastic forming performance, which can reduce the forming force, reduce the forming steps, shorten the production cycle, and save equipment investment. Therefore, the thermal forming technology of metal materials plays an important role in some complex parts. application. Due to the coupling effect of high temperature and deformation during thermal deformation, the internal microstructure of the material changes, and these microstructure changes will in turn affect the macroscopic deformation behavior and mechanical properties of the material, which has a decisive impact on the forming quality of the product. [0003] In t...

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Problems solved by technology

However, most numerical simulation software can perform simulation analysis of macroscopic deformation and temperature field, but cannot directly perform coupled analysis of macroscopic deformation and microstructure, and do not have the functions of simulating and predicting microstructure evolution.

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