摘要
研究了不同处理工艺对38CrMoAlA尺寸稳定性及硬度的影响,同时对微观组织的变化进行了分析。结果表明,淬火并回火后和氮化后分别增加深冷处理能够显著提高38CrMoAlA的尺寸稳定性,而在淬火后回火前和氮化后分别增加深冷处理对硬度的改善较为明显。氮化处理后再次进行深冷处理均能进一步提高尺寸稳定性和硬度。深冷处理能够使得马氏体基体上析出大量弥散分布的碳化物颗粒。
The effects of cryogenic treatment on dimensional stability and hardness of 38CrMoAIA steel were investigated. And the changes of the microstructure were analyzed. The results show that cryogenic treatment after tempering and nitriding improves the dimensional stability of 38CrMoAIA steel obviously. However, the improvement in hardness can be obtained by cryogenic treating prior to tempering and after nitriding. The cryogenic treatment after nitriding can improve the dimensional stability and hardness further. Furthermore, cryogenic treatment can promote the precipitation of ultra-fine carbides in the martensite matrix.
出处
《热加工工艺》
CSCD
北大核心
2015年第22期178-181,共4页
Hot Working Technology
基金
国家"高档数控机床与基础制造装备"科技重大专项(2011-ZX04002-031)
中国科学院新兴战略产业联盟(2012)
