Mn18Cr18N护环钢多火次锻造微观组织演变及模拟

Microstructure evolution of multi-heats forging of Mn18Cr18N retaining ring steel and numerical simulation

为研究多火次锻造过程微观组织演变规律,文章采用Gleeble-1500D热模拟试验机进行动态、静态和亚动态再结晶试验,获得动态、静态和亚动态再结晶模型;采用热处理炉进行晶粒长大实验,得到晶粒长大模型;将模型导入有限元软件DEFORM-2D,对其进行微观组织模拟,并进行同条件的锻造试验验证。结果表明,数值模拟与试验结果吻合较好。说明该文使用的微观组织模拟系统,能够用于预测Mn18Cr18N钢护环多火次热变形的微观组织演变规律,为实际护环生产工艺优化提供参考。

In order to investigate the microstructure evolution of Mnl8Crl8N retaining ring steel during multi-heats forging, the dynamic, static and subdynamic recrystallization models were obtained through experiments on Gleeble-1500D thermal simulation machine. The grain growth model was obtained through experiment in the heat treatment furnace. These models were then put into the finite element code Deform-2D to simulate the microstructure evolution. At last the forging verification experiments in the same conditions were conducted. The experimental results agreed well with that of the simulation. It validates that the micro-structure simulation system could be used for predicting the microstructure evolution in multi-heats forging and could make reference for optimizing forging processes in retaining ring production.