关键词: 深冷处理, 尺寸, 金相组织, 工艺流程

Abstract: The article mainly studies on the effect of cryogenic treatment on the dimensional stability and internal
microstructure of Cr18Ni9Ti bearing saet for micro-step motor. The results showed that the bearing saet size was stable after
cryogenic treatment and the internal microstructure was stable martensite. The bearing saet not undergone cryogenic
treatment had an increase in external dimensions after low-temperature storage testing, with the change variation in order of
size as outer diameter +0. 029 mm, inner diameter +0. 012 mm, thickness +0. 01 mm and with the internal microstructure
changing from unstable austenite to martensite. Optimize a new machining process for Cr18Ni9Ti bearing saet and verify
that the new process was feasible and applicability.