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为了进一步提高掘进机盘形滚刀的使用寿命,更充分地发挥基体钢(6Cr4W2Mo2V 钢)的性能,在经过充分锻造、无链状沿晶界分布的粗大碳化物的基体钢上,研究贝氏体-马氏体复相热处理对6Cr4W2Mo2V 钢的相变过程,显微组织和力学性能的影响。结果表明:在M_s 温度附近等温处理可获得贝氏体-马氏体复相组织。适量的先析贝氏体或马氏体,分割了过冷奥氏体晶粒,细化了随后转变马氏体或贝氏体的领域尺寸和条片大小,减小了有效晶粒和单位破断长度(unit crack path),从而使强度与韧性潜力得到更好发挥,是基体钢强韧化热处理的新工艺。
In order to further improve the service life of the TBM hobbing machine and give full play to the performance of the base steel (6Cr4W2Mo2V steel), after the forging, without chain along the grain boundary distribution of coarse carbide base steel, Effect of Body - Martensite Multiphase Heat Treatment on Phase Transformation, Microstructure and Mechanical Properties of 6Cr4W2Mo2V Steel. The results show that the bainite-martensite duplex structure can be obtained by isothermal treatment near the M_s temperature. An appropriate amount of precalcined bainite or martensite is used to divide the subcooled austenite grains, refining the field size and strip size of the subsequently transformed martensite or bainite, reducing the effective grains and units Breaking the length of the unit (unit crack path), so that the strength and ductility potential to get better play, is a new toughness of steel heat treatment of new technology.