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

A technology of microstructure and prediction methods, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as inability to analyze macroscopic deformation and microstructure coupling, and lack of microstructure evolution simulation and prediction functions.

Active Publication Date: 2016-03-02
WUHAN UNIV OF TECH
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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 perfo

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

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[0070] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0071] A method for predicting microstructure evolution law during thermal deformation of 20CrMnTiH steel, characterized in that it comprises the following steps:

[0072] 1) Conduct heat preservation and thermal compression physical tests on 20CrMnTiH steel to obtain experimental data including stress-strain curves, austenite grain growth size and recrystallization grain size under different process conditions;

[0073] 2) The macro flow stress constitutive model of 20CrMnTiH steel was established through the stress-strain curves of 20CrMnTiH steel under different process conditions obtained through thermal compression phy...

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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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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 冯玮华林韩星会秦飞吴舒婷
Owner WUHAN UNIV OF TECH
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