摘要
本文选取GCr15钢M_3点以上240℃等温处理和M_3点以下200℃预淬火—240℃等温处理两种试验工艺,分别研究了先形成贝氏体(B)和先形成马氏体(M)的组织及其强韧性。试验结果表明,在两种工艺获得M-B复合组织中,当M/B的组成比相同时,均表现出良好的强韧性配合。因此,有关先形成等温贝氏体对原奥氏体晶粒的分割及其所引起的马氏体细化模型,在改善高碳铬轴承钢的强韧性方面并无明显效果。
Two experimental processes were selected to treat GCr15 steel. They are isothermal trea-tment at 240℃ above the M_s point and prior quenching at 200℃ below the M_s point followedby isothetmal treatment at 240℃ respectively. The two types of microstructure thus obtained i.e.the microstructure with bainte formation followed by martensite formation and the microstruc-ture with martensite formation followed by bainite formation, and the strength and toughnessof the GCr15 steel are studied. The experimental results show that both technologies provideexcellent combination of strength and toughness of the steel, if the M/B duplex microstructurehas approximately equal volum fraction for martensite and bainite. Therefore, the model, accordingto which the firstly formed bainite partitions the austenite grains and thus refines the martensite,has no marked effect on improving strength and toughness of high carbon bearing steel.
出处
《钢铁》
CAS
CSCD
北大核心
1989年第5期45-49,44,共6页
Iron and Steel
