CAJ | 학술논문

研究采用多步低温等温贝氏体转变工艺处理后60CrNiMo钢组织与力学性能，用金相显微镜、扫描电镜及透射电镜观察60CrNiMo钢相组织，并进行硬度、拉伸和冲击等力学性能测试。结果表明，经淬火＋亚温淬火＋高温回火处理的60CrNiMo钢可得到细小均匀的二次回火马氏体＋铁素体混合组织，其力学性能得到改善；采用三步低温等温贝氏体转变工艺可有效减少材料块状残余奥氏体和细化贝氏体晶粒，从而提高60CrNiMo钢力学性能。
연구채용다보저온등온패씨체전변공예처리후60CrNiMo강조직여역학성능，용금상현미경、소묘전경급투사전경관찰60CrNiMo강상조직，병진행경도、랍신화충격등역학성능측시。결과표명，경쉬화＋아온쉬화＋고온회화처리적60CrNiMo강가득도세소균균적이차회화마씨체＋철소체혼합조직，기역학성능득도개선；채용삼보저온등온패씨체전변공예가유효감소재료괴상잔여오씨체화세화패씨체정립，종이제고60CrNiMo강역학성능。
Microstructure and mechanical properties of 60CrNiMo steel were investigated by means of different heat treatments .The phase microstructure was studied by OM ,SEM and TEM .Mechanical properties ,including hardness ,tensile and impact toughness were tested after different heat treat-ments .The results show that after isothermal quenching ,subcritical quenching and tempering ,the mixed microstructures are thin tempered martensite and ferrite and the mechanical properties of 60CrNiMo steel have been improved .The blocky retained austenite is reduced and the bainite plate is refined after multistep isothermal bainitic transformation .