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采用金相显微镜、透射电镜对中国低活化马氏体钢(CLAM)在600℃长期时效过程中的显微组织演变规律进行研究。结果表明,随时效时间的延长晶粒发生了一定粗化,晶粒尺寸由时效前约8μm增加到10μm(1000 h时效),金相显微组织没有发生明显变化;马氏体板条随保温时间的延长而增大,宽度由时效前的约400 nm增加到约700 nm(1000 h时效)。析出物发生了明显粗化,经过1000 h时效后最大尺寸约为200 nm。
The microstructure evolution of the Chinese low-activation martensitic steel (CLAM) during aging at 600 ℃ was studied by metallographic microscope and transmission electron microscope. The results show that the grain size increases with the aging time, and the grain size increases from about 8μm to 10μm (1000 h aging), and the microstructure does not change obviously. The martensite lath varies with the holding time The width increases from about 400 nm before aging to about 700 nm (1000 h aging). The precipitates have obviously roughened, and the maximum size after aging for 1000 h is about 200 nm.