摘要
采用DEFORM-HT模拟保温时间为10 min的热处理工艺,分析保温时间对试件硬度和残余应力的作用,再次用DEFORM-HT模拟改进的热处理工艺。模拟结果表明,3种热处理工艺完全满足硬度要求,当保温时间大于经验公式计算所得的保温时间时,保温时间对试件硬度影响可忽略不计。但随着保温时间的增加,试件热处理后的最大残余应力随之增大且高应力比例增大。在保温时间为5 min时,采用正火+渗碳+直接淬火+回火热处理工艺不仅保证了试件的硬度,减小了残余应力,而且减少了加工时间,提高了生产效率。
DEFORM-HT has been used to simulate the heat treatment process with holding time 10 minutes. The effect of holding time on the hardness and residual stress of the specimen is analyzed, and then DEFORM-HT is used to simulate the improved heat treatment process. The simulation results show that the three kinds of heat treatment process completely meets the hardness requirement. When the holding time is longer than the holding time calculated by empirical formula, the influence of holding time on the hardness of specimen can be neglected. However, with increasing of holding time, the maximum residual stress of the specimen after heat treatment increases and the ratio of large stress increases. When the holding time is 5 minutes, the heat treatment process of normalizing+carburizing+direct quenching+tempering not only ensures the hardness of the specimen, reduces the residual stress, but also reduces the processing time and improves the production efficiency.
作者
王红霞
李杰
郑彦博
WANG Hong-xia;LI Jie;ZHENG Yan-bo(Qiannan Polytechnic for Nationalities,Duyun Guizhou 558000,China)
出处
《热处理技术与装备》
2020年第4期5-10,共6页
Heat Treatment Technology and Equipment
