采用热等静压方法对气雾化316L奥氏体不锈钢粉末致密化,用箱式电阻炉对致密体进行了固溶处理,研究了固溶前后致密体的显微组织和力学性能,并对其拉伸断口形貌进行了分析.结果表明:热等静压态致密体密度接近理论全致密,内部组织为细小的奥氏体,存在较多的碳化物,抗拉强度、屈服强度分别达到595.3MPa和263.3MPa,延伸率为58.3%,硬度为HBS152.3;固溶处理使致密体强度和硬度降低,塑性增加,且随着固溶温度的提高,强度迅速降低,塑性明显提高,最佳固溶温度为1 050℃;在固溶温度为1 050℃和水冷的情况下,最佳保温时间为20min;固溶处理前后拉伸试样断口呈现明显的韧性断裂,固溶韧性好于固溶前的,均高于热轧态产品的韧性. The hot isostatic pressing method was used to densify the atomized 316L austenitic stainless steel powder. The compact was treated by a box type resistance furnace. The microstructure and mechanical properties of the densified body before and after solid solution treatment were studied. The results show that the density of hot isostatic pressing dense densities is close to that of the theory, the internal structure is fine austenite, there are more carbides, and the tensile strength and yield strength reach respectively 595.3MPa and 263.3MPa respectively. The elongation was 58.3% and the hardness was HBS 152.3. The strength and hardness of the dense body decreased with the solution treatment, and the plasticity increased. With the increase of solution temperature, the strength decreased rapidly and the plasticity increased obviously The optimum solution temperature is 1050 ℃. When the solution temperature is 1 050 ℃ and water cooling, the optimum heat preservation time is 20min. The fracture of the tensile specimen before and after solution treatment shows obvious ductile fracture with better solution toughness Before solid solution, are higher than the toughness of hot-rolled products.