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采用预置粉末法在45钢表面激光熔覆制备AlCrCoMnNiFe涂层。利用光学显微镜、扫描电镜、能谱仪和X射线衍射仪,对涂层的组织、合金元素分布及物相组成进行分析。利用显微硬度计、摩擦磨损试验机、电化学工作站测试涂层硬度、耐磨性以及耐蚀性。结果表明,涂层表面成型质量较好,组织均匀致密,存在等轴晶和柱状晶两种形态,主要由γ、Al_(5.5)Cr_(1.9)Fe_(2.55)、(Ni,Co)_3Al_4、(Al,Fe)_4Cr和AlMnCo_2相组成。涂层的硬度最高可达780 HV0.2,硬度和耐磨性比基体提高2倍多。涂层的自腐蚀电位较基体提高3倍,自腐蚀电流密度较基体小,涂层耐蚀能力提高明显。
AlCrCoMnNiFe coating was prepared by laser cladding on the surface of 45 steel with preset powder method. The microstructure, alloying element distribution and phase composition of the coatings were analyzed by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The hardness, wear resistance and corrosion resistance of the coating were tested using a microhardness tester, a friction and wear tester, and an electrochemical workstation. The results show that the forming quality of the coating surface is good and the microstructure is uniform and compact. There are two forms of equiaxed grains and columnar grains, which are mainly composed of γ, Al 5.5 Cr 1.9 Fe 2.55, Ni, Co 3 Al 4, (Al, Fe) _4Cr and AlMnCo_2 phases. The coating hardness of up to 780 HV0.2, hardness and wear resistance increased more than 2 times the substrate. The self-corrosion potential of the coating is 3 times higher than that of the matrix, the self-corrosion current density is smaller than that of the matrix, and the corrosion resistance of the coating is obviously improved.