奥氏体形变对45钢显微组织和显微硬度的影响  

Effect of Austenitic Deformation on Microstructure and Microhardness of 45 Steel

作　　者：杨湄[1] 万鸣[2] 吴承辉 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039 [2]西华大学建筑与土木工程学院,四川成都610039 [3]成都富江机械制造有限公司,四川成都610039

出　　处：《热加工工艺》2012年第10期179-181,共3页Hot Working Technology

基　　金：四川省高校重点实验室开放研究基金资助项目(西华教字[2009]184号)

摘　　要：对45钢进行不同温度、变形量和应变率形变后立即淬火,探讨了奥氏体形变与晶粒细化和马氏体形态的相互关系。实验表明:45钢加热到830℃、冷却到800℃形变后淬火,显微硬度与未形变淬火相比有所下降,冷却到760℃以两种应变率形变后淬火,均发生奥氏体形变诱导铁素体相变,显微硬度均比未形变淬火的低,说明马氏体形态与奥氏体形变和晶粒细化有一定关系。The quenching of 45 steel at different temperatures,deformation and strain-rate deformation were carried out.The relationships between austenite deformation,grain refinement and the martensitic forms were discussed.The results show that： 45 steel is heated to 830 ℃,and then deformated and quenched at 800 ℃,the hardness decreases compared with unstrain hardening.Cooled to 760℃ to quenching with two strain-rate deformation,austenite deformation induced ferrite transformation occurs,the microhardness is lower than those without strain quenching.The results show that the martensitic morphology has effects on the austenite deformation and grain refinement.

关 键 词：形变温度 应变率 奥氏体晶粒 马氏体形态 

分 类 号：TG156.3[金属学及工艺—热处理]