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利用激光熔覆方法在热处理后的T10A钢表面制备FeCrTiMoNiCo高熵涂层,然后利用X射线衍射仪和显微镜分析了试样熔覆层及基体界面处的相结构及组织变化,并采用显微硬度计测试了试样处理后的截面硬度。结果表明,经过激光熔覆技术得到的高熵合金层主要由Fe基固溶体组成,并且含有少量的金属间化合物,激光功率对化合物组成有一定影响。熔覆层的组织为椭圆形胞状晶和柱状晶,其中胞状晶沿着短轴方向排列成长条状,熔覆层厚度随激光功率的增加逐渐提高。熔覆层的硬度最高达到了780 HV,比基体硬度高230 HV,随激光功率的增加,硬度先增加后降低。
The FeCrTiMoNiCo high entropy coating was prepared by laser cladding on the surface of the heat-treated T10A steel. The phase structure and microstructure of the coating were analyzed by X-ray diffraction and microscopy. The microhardness The hardness of the section after the test of the sample was measured. The results show that the high entropy alloy layer obtained by laser cladding is mainly composed of Fe - based solid solution and contains a small amount of intermetallic compounds. The laser power has some influence on the composition of the compounds. The microstructure of the coating is oval cellular crystal and columnar crystal, in which the cellular crystal is arranged in a long strip along the short axis, and the thickness of cladding layer increases with the increase of laser power. The hardness of cladding layer reaches up to 780 HV, which is 230 HV higher than that of matrix. With the increase of laser power, the hardness first increases and then decreases.