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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。
The new type of plastic mold standard parts mandrel steel 65MnV quenching and low temperature tempering process changes in the organization of a systematic study. The results show that the quenched microstructure of 65MnV steel is dislocation martensite. With the increase of quenching temperature, the quenched microstructure gradually changes from acicular to lath martensite to acicular martensite, The substructures of the martensite are transformed from dislocation-type martensite to twinned martensite. When the steel is tempering at low temperature, a whisker-like ε carbide precipitated in the matrix is precipitated. The ε carbides transform with the increase of tempering temperature to form non-coherent rod-like cementite.