两相区淬火工艺对17Ni4.5CrMoV铸钢组织和力学性能的影响

Effect of Intercritical Quenching Treatment on Microstructure and Mechanical Properties of 17Ni4.5CrMoV Cast Steel

研究了两相区淬火工艺参数(淬火温度、回火温度)对17Ni4.5CrMoV铸钢组织和力学性能的影响。结果表明,在两相区淬火工艺条件下,17Ni4.5CrMoV铸钢的组织得到细化,同时获得回火马氏体及铁素体混合组织,以及少量的逆转变奥氏体,这些使铸钢强韧性匹配得到较大改善。此外,确定了17Ni4.5CrMoV铸钢合适的两相区淬火工艺。

The effects of intercritical treatment parameters, such as quenching temperature and tempering temperature on microstructure and mechanical properties of 17Ni4.SCrMoV cast steel were investigated. The results show that, after intercritical quenching treatment, the microstructure of cast steel is fined, meanwhile a mixed microstructure containing tempering martensite and ferrite as well as a small amount of precipitated austenite are obtained, which results in greater improvementer on the matching of strength and toughness of the cast steel. Moreover, the optimal intercritical quenching process for 17Ni4.SCrMoV cast steel is obtained.