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金属学报  2005 

淬火合金钢中的奥氏体稳定化

, PP. 673-679

Keywords: 奥氏体稳定化,热稳定化,化学稳定化

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Abstract:

研究了马氏体(M)和贝氏体(B)两相温度区等温淬火组织中的奥氏体稳定化.在一定等温时间内,奥氏体稳定化程度,即残余奥氏体量与等温温度间的关系呈马鞍型曲线.在实验钢中,其谷底值低于用同冷却介质淬火组织中的AR,表明在一定条件下等温停留并不引起残余奥氏体量增多.可利用马鞍型曲线调整AR与M及B的含量配比,获得无变形或强韧性配合最佳的准贝氏体等温淬火工艺.奥氏体稳定化为热稳定化、化学稳定化、相致稳定化和宏观热应力稳定化诸机制的综合作用.马氏体临界点Mc点无特殊物理意义.

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