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利用连续CO_2激光器对渗碳和渗硼后的20CrNiMo和20Ni4Mo钢进行激光表面相变硬化和激光表面熔化处理,以研究激光表面处理对钢的组织与耐磨性的影响。用金相、电镜、X光及电子探针观察和分析显微组织结构、表层成分分布、磨损表面及磨屑形貌。 对20CrNiMo和20Ni4Mo钢进行多次激光相变硬化处理。结果表明,多次激光相变硬化提高了钢的耐磨性,并且显微组织与普通淬火、一次激光硬化钢有很大不同。钢经渗碳、渗硼再激光表面熔化后,表层成分组织均发生根本变化,耐磨性得到提高。渗碳钢经激光熔化后的耐磨性较低,这主要是因大量的奥氏体和渗碳体组成的共晶组织的硬度较低所致。
The laser surface transformation hardening and laser surface melting treatment of 20CrNiMo and 20Ni4Mo carburized and boronized carburized carburized and boronized steel were carried out by continuous CO 2 laser to study the effect of laser surface treatment on the microstructure and wear resistance of steel. Microstructure, surface composition distribution, wear surface and wear debris morphology were observed and analyzed by metallography, electron microscope, X-ray and electron probe. Several laser phase hardening treatments of 20CrNiMo and 20Ni4Mo steels were performed. The results show that multiple laser transformation hardening increases the wear resistance of the steel, and the microstructure is very different from ordinary quenching and primary laser hardening steel. After carburizing and boronizing, the laser surface is melted, the surface components and tissues undergo fundamental changes, and the wear resistance is improved. The wear resistance of carburized steel after laser melting is lower, mainly due to the lower hardness of the eutectic structure consisting of a large amount of austenite and cementite.