Transactions of Materials and Heat Treatment

Title：Numerical simulation study on dynamic recrystallization during hot extrusion of 304 stainless steel

Authors： Li Chunyu Qiu Chunlin

Unit： State Key Laboratory of Rolling Technology and Continuous Rolling Automation Northeastern University

KeyWords： 304 stainless steel dynamic recrystallization hot extrusion microstructure evolution grain size

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2024,49(10):56-64

Abstract：

For 304 stainless steel, the microstructural evolution of experimental steel tube during the hot extrusion process was studied by using the finite element method. Firstly, a single-pass hot compression experiment was performed by using a thermal simulator, and the constitutive equation and dynamic recrystallization model of the experimental steel were determined. Then, after establishing a thermo-mechanical coupling model for the hot compression and hot extrusion processes in software ABAQUS, the accuracy of the numerical model was verified by comparison between the simulation and experiment of hot compression. Finally, the change laws of the temperature and stress-strain fields during the hot extrusion simulation of the experimental steel were further analyzed, and the microstructural evolution were numerically simulated with the help of the secondary development function of ABAQUS to reveal the change laws in dynamic recrystallization volume fraction, grain size, average grain size and grain distribution uniformity. The results show that in the early stage of extrusion, the grain size at the front end of steel tube is coarse, while in the steady-state and later stages of extrusion, the grain size of steel tube is smaller and evenly distributed. With the increasing of initial billet temperature and extrusion speed, the uniformity of grain size distribution both show a trend of first increase and then decrease.

Funds：

国家重点研发计划（2021YFB3702001）

作者简介：李春雨（1998-），男，硕士,E-mail：li15566271250@163.com;通信作者：邱春林（1964-），男，硕士，副教授,E-mail：qiucl@ral.neu.edu.cn

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