Inconel-718 alloy (IN-718) is a nickel-based superalloy that has extensive applications in many industries such as power generation, gas turbine, tubing hangers, safety valves systems, aerospace, nuclear engineering, etc. However, noticeable wear occurs on the IN-718 structure, leading to reduction in service life and failure of components. In the present study, the ball-milled alloy powders FeCoCrNiAlCuMn were preplaced on the IN-718 substrate and the substrate was alloyed through Plasma Transferred Arc (PTA) process. Then, the thickness of the alloyed region, phase formation, microstructural changes, microhardness and influence of alloy powder on the tribological properties were analysed. Further, the mechanism involved during the wear test and surface roughness of worn-out specimens were studied. The result shows that the PTA alloyed region possesses different phases such as BCC, FCC and intermetallic compounds. The alloying elements were well mixed with the substrate material and good metallurgical bonding was formed. The microhardness of 883 HV_0.2 was achieved in the alloyed region while the substrate showed 312 HV_0.2. The alloyed specimen exhibited superior wear resistance compared to the substrate due to the higher binding force of alloying elements such as Fe, Co, Ni and Co, which restricted the material deformation during the wear test. Moreover, broadening of the BCC phase of the alloyed region and intermetallic phase increased the hardness of the alloyed region, resulting in the improvement of wear resistance. The oxide phases such as Al₂O_3, CuO, Cr₂O₃, NiO and FeO were formed in the alloyed region during the wear test due to the formation of frictional heat. These oxide layers acted as a lubricant film to protect the alloyed region as well as diminished the Coefficient of Friction (CoF).

Inconel-718 合金（IN-718）是一种镍基高温合金，在发电、燃气轮机、油管悬挂器、安全阀系统、航空航天、核工程等众多行业中有着广泛的应用。 然而，在IN-718 结构，导致使用寿命缩短和组件故障。在本研究中，球磨合金粉末 FeCoCrNiAlCuMn 预先放置在 IN-718 基材上，并通过等离子转移弧 (PTA) 工艺使基材合金化。然后，分析了合金化区的厚度、相形成、显微组织变化、显微硬度以及合金粉末对摩擦学性能的影响。此外，研究了磨损试验过程中涉及的机制和磨损试样的表面粗糙度。结果表明，PTA合金化区具有不同的相，如BCC、FCC和金属间化合物。合金元素与基体材料混合良好，形成良好的冶金结合。883 HV的显微硬度合金区域达到_0.2，而基材显示 312 HV _0.2。由于 Fe、Co、Ni 和 Co 等合金元素的结合力更高，从而限制了材料在磨损试验期间的变形，合金试样与基体相比表现出优异的耐磨性。此外，合金区的 BCC 相和金属间相的增宽增加了合金区的硬度，从而提高了耐磨性。Al ₂ O _3、 CuO、Cr ₂ O ₃等氧化物相由于摩擦热的形成，在磨损试验期间在合金化区域形成了 NiO 和 FeO。这些氧化层充当润滑膜以保护合金区域并降低摩擦系数 (CoF)。