对金属粉末注射成形316L不锈钢精密件进行了固溶处理和表面氮化处理。实验结果表明,固溶处理后样品的晶粒进一步长大,晶粒尺寸分布逐渐均匀,气孔数量减少;样品的相对密度在固溶处理过程中稍有增加,样品的硬度先是随温度升高而提高,但是当固溶温度升高到1100℃,硬度反而稍微降低。样品经500℃×2 h渗氮处理后,形成20μm厚的渗氮层,表面硬度显著提高,主要原因是渗层中出现富铬的化合物相。 The metal powder injection molding 316L stainless steel precision parts were solution treatment and surface nitriding. The experimental results show that the grains grow further after solution treatment, the grain size distribution is uniform and the number of pores decreases. The relative density of the sample slightly increases during solution treatment. The hardness of the sample first increases with the increase of temperature But when the solution temperature increases to 1100 ° C, the hardness decreases slightly. After the sample was nitrided at 500 ℃ for 2 h, a nitrided layer with a thickness of 20 μm was formed. The surface hardness increased significantly, mainly due to the presence of chromium-rich compound phase in the layer.