CLAM钢在600℃长期时效过程中的组织演化
Microstructure evolution of CLAM steel aging at 600℃ for long time
赵飞,严琰,罗敏,叶翠,李妮,刘燕,万发荣
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作者单位：贵州大学材料与冶金学院
中文关键字：中国低活化马氏体钢；显微组织；时效；析出物
英文关键字：China low activation martensitic steel; microstructure; aging; precipitates
中文摘要：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，随着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8微米增加到10微米(1000h时效)，金相显微组织没有发生明显变化；马氏体板条随着保温时间的延长而增大，宽度由时效前的约400nm增加到约700nm（1000h时效）。析出物发生了明显粗化，经过1000小时时效后最大尺寸约为200nm.
英文摘要： Microstructure evolution of CLAM steel aging at 600℃ for long time was investigated by optical microscope and TEM. The results indicated that the grains coarsening slightly with the increasing aging time, but the metallographic structure was no change. Grain size is about 8µm before aging, while it was about 10 µm after aging for 1000h. The martensite lath increased with the aging time prolonging, the wide of lath increased from 400nm (no aging) to700nm (aging for 1000h). Precipitates coarsening with the increasing aging time obviously, the size was about 200nm after aging for 1000h.