【摘要】 对新型塑料模具标准件顶杆用钢６５ＭｎＶ在淬火和低温回火过程组织的变化进行了系统的研究。结果表明，６５ＭｎＶ钢的低温淬火组织为位错马氏体组织，随淬火温度的升高，淬火组织逐渐由针状与板条状马氏体的混合组织变成针状马氏体组织，马氏体组织的亚结构由位错型马氏体向孪晶马氏体转变。钢在低温回火时析出与基体共格的弥散分布的须状ε碳化物，ε碳化物随回火温度的升高而发生转变，形成非共格的棒状渗碳体组织。更多还原

【Abstract】 The dependence of microstructure of newly developed plastic die ejector pins steel 65MnV on quenching temperature and tempering temperature was studiedThe results show that the quenching structure of 65MnV steel is mainly composed of dislocation martensite.With the increasing of quenching temperature,the structure changes from the composition of needle and plate martensite to needle martensite,the microstructure of martensite changes from dislocation to twin. carbide is precipitated in 65MnV steel at low tempering temperature.The decomposition of carbide and precipitation of M3C carbide can be observed at higher tempering temperature.更多还原