SDP1塑料模具钢锻造过程组织演变的数值模拟  

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

作　　者：王笑驰 左鹏鹏 吴晓春[1,2,3] Wang Xiaochi;Zuo Pengpeng;Wu Xiaochun(State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shangda Xinlun Material and Technology Co.,Ltd.,Shanghai 200072,China)

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学材料科学与工程学院,上海200444 [3]上大鑫仑材料科技(上海)有限公司,上海200072

出　　处：《锻压技术》2023年第2期16-28,共13页Forging & Stamping Technology

基　　金：国家重点研发计划项目(2016YFB0300400)。

摘　　要：为改善SDP1塑料模具钢锻造过程中的粗晶问题,利用Deform软件建立了SDP1塑料模具钢锻造过程中的组织演变模型,通过有限元模拟以及元胞自动机的方法研究了不同工艺参数以及两镦两拔工艺对锻造过程中组织演变的影响。结果表明:锻造温度为1100℃时,锻件内部晶粒细小均匀,动态再结晶和晶粒长大的影响达到平衡,平均晶粒尺寸保持在40~50μm;随着压下量和压下速度的增加,晶粒细化显著,但过大易使锻件损坏;送给量为50%~60%时拔长效果最佳,满足拔长效率和晶粒尺寸的要求;经过两镦两拔处理后,锻件整体的平均晶粒尺寸为5~20μm,说明两镦两拔工艺能够有效地细化晶粒尺寸。所得结果对于SDP1塑料模具钢的实际生产具有一定的指导意义。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.

关 键 词：SDP1塑料模具钢 锻造 组织演变 两镦两拔工艺 晶粒尺寸 

分 类 号：TG316[金属学及工艺—金属压力加工]