通过控制Ni基自熔性合金粉末中Al、Mo含量，在H13钢表面原位制备了含γ′-Ni3Al强化相的激光熔覆涂层。借助光学显微镜(OM)、扫描电镜(SEM)和X射线衍射仪(XRD)分析了不同熔覆层的显微组织及物相结构。结果表明，4种成分的熔覆层均呈现出平整致密、无明显缺陷的宏观特征。Ni基自熔性合金粉末中加入Al易于生成γ′-Ni3Al相，当Al含量达到一定程度后，涂层中开始出现β-NiAl相，同时Fe主要以(Fe，Cr)固溶体形式存在，(Ni，Cr)固溶体极少。加入Mo后，涂层中几乎未见β-NiAl相；Al含量较少时，Mo主要与Fe结合形成Mo-Fe金属间化合物；当Al含量增加至开始出现β-NiAl相时，Mo便与Al结合形成AlMo3。同时Mo-Fe金属间化合物的存在也导致(Fe，Cr)固溶体较同等Al含量下未加入Mo时少，(Ni，Cr)固溶体含量较未加入Al时多。涂层摩擦系数均低于基体，最高显微硬度为基体的4.3倍，抗磨性提高了3.8倍。

In situ laser cladding coating with γ′-Ni3Al strengthening phase is fabricated by controlling the Al and Mo contents in Ni-based self-fluxing alloy powder on H13 die steel surface. The microstructure and phase structure of the four kinds of chemical composition powder are analyzed by means of optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results indicate that the macroscopic morphologies of the four kinds of laser cladding coatings are smooth, dense and without obvious macroscopic defects. Ni-based self-fluxing alloy powder with Al added is easier to generate -Ni3Al phase. When the Al content reaches a certain degree, β-NiAl phase is found in the coating. Fe mainly exists as (Fe, Cr) solid solution, while the (Ni, Cr) phase is small. The β-NiAl phase is almost not found when Mo is added in the coating. When the Al content is small, Mo and Fe combining to form Mo-Fe are intermetallic compound. But when β-NiAl phase is generated in the coating as the Al content increases, Mo and Al combine to form AlMo3. The existence of Mo-Fe intermetallic compound makes (Fe, Cr) solid solution less than that of the same Al content without Mo, but the (Ni, Cr) solid solution is more than without Al. The friction coefficients of all cladding coating samples are lower than the H13 steel substrate. The highest microhardness of the coating increases by 3.3 times and the wear resistance increases by 3.8 times, respectively, in comparison with the substrate.