H13钢激光淬火与离子渗氮复合工艺研究

Study on Laser Quenching and Plasma Nitriding Compound Process of H13 Steel

为了提高热作模具钢的表面性能,研究了激光淬火、离子渗氮以及激光淬火/离子渗氮复合处理工艺对H13钢改性层的摩擦磨损性能和耐蚀性能的影响及影响机理。采用光学显微镜、扫描电镜和能谱仪等设备对不同工艺热处理试样表面形貌、表面化学成分以及微观组织进行表征。结果表明:复合处理工艺可以显著改善改性层的摩擦磨损性能,提高材料表面的耐蚀性。和单一激光淬火和单一渗氮处理相比,复合处理后改性层的平均摩擦系数明显降低,自腐蚀电位明显提高,表明复合处理后改性层的耐磨性显著增加,耐蚀性明显提升。

In order to improve the surface properties of hot work mold steel,the influence and mechanism of laser quenching,plasma nitriding and laser quenching/plasma nitriding composite treatment process on the friction,wear and corrosion resistance of the modified layer of H13 steel were studied.The surface morphology,surface chemical composition and microstructure of samples with different heat-treated were char-acterized by optical microscope,scanning electron microscope and energy dispersive spectrometer.Results showed that the composite treatment process could significantly improve the friction and wear resistance of the modified layer,and improve the corrosion resistance of the material surface.Compared with the single laser quenching and single nitriding treatment,the average friction coefficient of the modified layer after com-posite treatment declined significantly,the self-corrosion potential was remarkably increased,which indicated that the wear resistance and cor-rosion resistance of the modified layer after composite treatment were improved dramatically.