摘要
718塑料模具钢在制造模具前需要进行淬火及回火预处理,使硬度达到29～35HRC,要求同一截面的硬度差不大于3HRC。然而对于大型的模块难以制定合理的预硬化工艺来保证硬度均匀一致且无淬火裂纹。为了改进并优化预硬化工艺,对718钢大模块淬火过程的瞬态温度场及组织场进行了耦合数值模拟。通过比较三种不同淬火工艺的模拟结果,为718模具钢大模块设计了一种较佳的淬火工艺,即淬入水中之前先在空气中预冷,淬水之后将模块出水在空气中自回火。
Before made into mould, plastic mould steel 718 needs to be pre-hardened to 29-35HRC with the biggest hardness difference of 3HRC in the same section by quenching and tempering. It is very difficult to design suitable pre-hardening technology which can ensure consistent hardness distribution without any cracks on large modules. In order to improve and optimize the pre-hardening technology, the temperature field and microstructure field of large-sized plastic mould made of steel 718 were numerically simulated. By comparing the simulation results of different quenching technologies, a better quenching technology was worked out, i.e., pre-heating before quenching into water and self-tempering in air after quenching.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第5期22-25,共4页
Materials For Mechanical Engineering
关键词
淬火工艺
数值模拟
塑料模具钢
quenching technology
numerical simulation
plastic mould steel
