一、前言近年来,由于微合金化技术、控轧或控锻技术的发展而产生的非调质钢具有节省能源、简化工艺、提高生产效率、提高零件质量等优点,经济效益显著。因此,引起了国内外冶金和机械行业的充分重视[1～3]。本试验根据 EQ140东风汽车典型调质零件的服役条件,用1984年年底进厂的由无锡钢厂 I. Introduction In recent years, non-quenched and tempered steel produced due to the development of microalloying technology, controlled rolling or controlled forging technology has the advantages of energy saving, simplification of process, improvement of production efficiency, improvement of parts quality and the like, and has obvious economic benefits. Therefore, domestic and foreign metallurgy and machinery industry has caused full attention [1 ~ 3]. The test according to EQ140 Dongfeng Motor typical conditioning parts service conditions, by the end of 1984 into the plant from Wuxi Steel