Transactions of Materials and Heat Treatment

Title：Numerical simulation of microstructure evolution for SDP1 plastic die steel during forging process

Authors： Wang Xiaochi1 2 Zuo Pengpeng1 2 3 Wu Xiaochun1 2 3

Unit： 1.State Key Laboratory of Advanced Special Steel 2.Shanghai University 3.Shangda Xinlun Material and Technology Co. Ltd.

KeyWords： SDP1 plastic die steel forging microstructure evolution two-time upsetting and two-time stretching process grain size

ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(2):16-28

Abstract：

In order to improve the coarse grain problem in the forging process of SDP1 plastic die steel, the microstructure evolution model of SDP1 plastic die steel during the forging process was established by software Deform, and the influences of different process parameters and two-time upsetting and two-time stretching process on the microstructure evolution during the forging process were researched by finite element simulation and cellular automata method. The results show that the grains are fine and uniform in forgings at the forging temperature of 1100 ℃, the effects of dynamic recrystallization and grain growth are balanced, and the average grain size is 40-50 μm. With the increasing of reduction amount and reduction velocity, the grain refinement is significant, but when they are too large, it is easy to damage the forgings. When the feed amount is 50%-60%, the best stretching effect is achieved, which meets the requirements of stretching efficiency and grain size. After the treatment of two-time upsetting and two-time stretching, the overall average grain size of forgings is 5-20 μm, which shows that two-time upsetting and two-time stretching process can refine the grain size effectively. Thus, the obtained results have certain guiding significance for the actual production of SDP1 plastic die steel.

Funds：

国家重点研发计划项目（2016YFB0300400）

作者简介：王笑驰(1997-)，男，硕士研究生，E-mail：wxc410@163.com；通信作者：吴晓春(1961-)，男，博士,博士生导师，教授，E-mail：wuxiaochun@shu.edu.com

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