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采用光学显微镜(OM)、扫描电镜(SEM)及能谱分析(EDS)等手段,研究了不同含量的钆(Gd)对5Cr5MoSiV1钢微观组织和力学性能的影响。结果表明,Gd能够明显细化实验钢晶粒,消除偏析现象,提高实验钢的回火稳定性,使实验钢微观组织由回火索氏体向回火托氏体和回火马氏体转变;能够明显提升实验钢的硬度、抗拉强度及延伸率;使拉伸试样断口从解理及沿晶断裂向准解理断裂转变。Gd含量为0.131%(质量分数)时实验钢的变质效果较佳。
The effects of different contents of gadolinium (Gd) on the microstructure and mechanical properties of 5Cr5MoSiV1 steel were investigated by optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that Gd can obviously refine the grain of experimental steel, eliminate the segregation phenomenon and improve the tempering stability of experimental steel, so that the microstructure of experimental steel changes from tempered sorbite to tempered and tempered martensite ; Can significantly enhance the hardness of the experimental steel, tensile strength and elongation; the tensile specimen fracture cleavage and intergranular fracture to quasi-cleavage fracture transition. When the Gd content is 0.131% (mass fraction), the deterioration effect of experimental steel is better.