针对提高20Cr13不锈钢的表面性能，采用激光熔覆技术在基体表面制备M2铁基和Ni60A镍基合金熔覆层；通过使用光学显微镜、显微硬度计以及电化学工作站对两种熔覆层进行金相组织、显微硬度和电化学腐蚀性能差异性研究;结果表明:铁基、镍基熔覆层与基体结合界面均有明显的白亮带，无气孔、裂纹等缺陷；铁基涂层微观组织主要由等轴晶和胞状晶组成，镍基涂层微观组织主要由和树枝晶组成；铁基涂层的显微硬度为5417 HV，镍基涂层的显微硬度为5923 HV，约为基体显微硬度（2207 HV）的2~3倍；铁基、镍基涂层均与20Cr13钢基体表面形成了较好的冶金结合，二者表面硬度均有了有显著提升，在熔覆区采用Ni60A镍基材料时的显微硬度要比采用M2铁基材料时的显微硬度高，而在热影响区部位两者显微硬度相差不大；铁基涂层的自腐蚀电位（-021 V）略高于镍基涂层的自腐蚀电位（-023 V），铁基涂层的耐腐蚀性优于镍基涂层。
In order to improve the surface performance of 20Cr13 stainless steel，the M2 Febased and Ni60A Nibased alloy cladding layers were prepared on the substrate surface by laser cladding technology.The differences of metallographic structure，microhardness and electrochemical corrosion properties of the two cladding layers were studied by optical microscope，microhardness tester and electrochemical workstation.The results show that there are obvious white bright bands at the interface of the Fe/Ni based cladding layer and the substrate，and there are no defects such as pores and cracks.The microstructure of the Febased coating is mainly composed of equiaxed crystal and cellular crystal，while the microstructure of the Nibased coating is mainly composed of columnar crystal and dendritic crystal.The microhardness of the Febased coating was 5417HV，and that of the Nibased coating was 5923HV，which was 2~3 times of that of the matrix microhardness (2207HV).The Febased and Nibased coatings have formed a good metallurgical bond with the 20Cr13 steel substrate surface，and their surface hardness has been significantly improved.The microhardness of Ni60A Nibased material in the coatingzone is higher than that of M2 Febased material，and there is little difference in the microhardness of the two in the heat affected zone;The selfcorrosion potential of the ironbased coating (-021v) was slightly higher than that of the nickelbased coating (023v)，and the corrosion resistance of the ironbased coating was better than that of the nickelbased coating.
ZHOU Zhi-jie, XU Lei, DU Yan-bin,,ZHANG Lei. Microstructure and Properties of Laser Cladding Fe/Ni Base Alloy Coating on 20Cr13 Surface Steel[J]. Journal of Chongqing Technology and Business University(Natural Science Edition）,2021,38(2):69-74