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研究了６５ＭｎＶ钢在淬火和回火条件下的微观结构以及其力学性能随回火温度的变化。结果表明，６５ＭｎＶ钢经８４０℃淬火、１８０～２２０℃回火可获得高的强韧性；并且钢中含有０．１％、直径为１０～５０ｎｍ弥散分布的ＶＣ颗粒，奥氏体晶粒平均直径为７．０μｍ；钢的淬火组织为位错型板条马氏体和分布其间的薄膜状残余奥氏体；低于２２０℃回火时，钢中只析出２～１５ｎｍ粗细、长度为３０～１４０ｎｍ均匀分布的须状ε碳化物。这些亚结构的配合是６５ＭｎＶ钢具有高强韧性的本质。
The microstructure of 65MnV steel under quenching and tempering conditions and the change of its mechanical properties with tempering temperature were studied. The results show that the 65MnV steel is quenched at 840 ℃ and tempered at 180 ~ 220 ℃, and the high strength and toughness is obtained. The steel contains 0.1% VC particles with 10 ~ 50nm diameter dispersion and the average diameter of austenite grains Is 7.0μm; the quenched microstructure of the steel is dislocation lath martensite and film-like residual austenite distributed therebetween; tempering below 220 ℃, the precipitated steel only 2 ~ 15nm thickness, a length of 30 ~ 140nm uniform distribution of whisker ε carbide. The combination of these substructures is the essence of the high strength and toughness of 65MnV steel.