The microstructural evolution and tribological characteristics of a laser additive manufactured 12CrNi2V steel heat‐treated with four conditions are thoroughly studied to provide beneficial guidance to the prospective application of additive manufactured Cr–Ni–V steels. First, the four conditions of heat treatments are identified via a differential scanning calorimeter test. Subsequently, scanning electron microscopy, X‐ray diffraction, and electron backscattering diffraction are performed to characterize the morphologies, phase composition, and crystallographic textures of the experimental specimens. The microhardness and tribology tests are then conducted. Experimental results illustrate that the homogeneity of the microstructure is a significant factor in determining the tribological characteristic, which is mainly controlled by the type and distribution of the carbides. The heat treatments adopted in this work can remarkably modify the laser‐induced microstructural inhomogeneity, thereby promoting the tribological characteristic of the steel. Furthermore, the specimen tempered at 620 °C demonstrates an excellent combination of microhardness and toughness. Therefore, it is concluded that 620 °C is the optimal tempering temperature for the laser additive manufactured 12CrNi2V steel.

中文翻译：

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热处理对激光熔敷低合金12CrNi2V钢的组织演变和摩擦学特性的影响

对在四种条件下热处理过的激光添加制造的12CrNi2V钢的微观结构演变和摩擦学特性进行了彻底研究，为添加后制造的Cr-Ni-V钢的未来应用提供了有益的指导。首先，通过差示扫描量热仪测试确定四个热处理条件。随后，进行扫描电子显微镜，X射线衍射和电子反向散射衍射，以表征实验样品的形貌，相组成和晶体学织构。然后进行显微硬度和摩擦学测试。实验结果表明，微观结构的均匀性是决定摩擦学特性的重要因素，主要受碳化物的类型和分布控制。这项工作中采用的热处理可以显着改变激光诱导的微观结构不均匀性，从而提高钢的摩擦学特性。此外，在620°C下回火的试样显示出显微硬度和韧性的极佳组合。因此，可以得出结论，对于用激光添加剂制造的12CrNi2V钢，最佳回火温度为620°C。