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本文论述了研究激光相变硬化机理的意义。对激光相变硬化机理的文献进行了综述。借助于光学金相,显微硬度、透射和扫描电子显微镜、X线衍射仪、俄歇分析仪和电子探针研究了GCr15钢的激光相变硬化机理。试验结果表明,激光相变硬化的本质仍然在于马氏体相变。激光相变硬化获得超高硬度的机理是在激光超快速加热和急冷的条件下,其马氏体相变有特殊性,即超高硬度是以马氏体的特殊性为主体,同时残留奥氏体强化,晶粒细化强化,碳化物弥散强化以及激光淬火前的原始组织中的强化因素的遗传性等多种强化因素也有不可忽视的贡献。
This article discusses the significance of studying the mechanism of laser phase change hardening. The literature review of laser phase-change hardening mechanism is reviewed. The mechanism of laser transformation hardening of GCr15 steel was studied by means of optical metallography, microhardness, transmission and scanning electron microscopy, X-ray diffraction, Auger analyzer and electron probe. The experimental results show that the essence of laser phase transformation hardening still lies in martensitic transformation. The mechanism of laser phase-change hardening to obtain ultra-high hardness is that the martensite transformation is special under the condition of laser ultra-rapid heating and quenching. That is, super-high hardness takes the particularity of martensite as the main body, A variety of strengthening factors such as strengthening of the body, strengthening of the grain, strengthening of the carbides, and inheritance of strengthening factors in the original structure before the laser quenching also have a significant contribution.