In this work, a novel alloy design of a stainless steel with a ferritic-austenitic microstructure is derived for PBF-LB/M (powder bed fusion-laser beam/metal). The alloy was developed based on X2CrNiMo17-12-2 steel, for which an austenite volume content of approx. 54 vol% in the PBF-LB/M state was achieved using a reduced Ni equivalent. Partial substitution of Ni by Mn increases the N solubility of the alloy. By melting and further gas-atomizing this melt in an N₂ atmosphere, an N content of 0.27 mass% was set in the produced steel powder. This leads to both high strength and high corrosion resistance of the PBF-LB/M-processed steel. However, microstructural investigations in the PBF-LB/M state confirm a microstructure consisting of ferrite, austenite, and Mo- and Cr-rich nitrides of M₂N type. The nitrides were not completely eliminated by a subsequent heat treatment of the PBF-LB/M samples. As a result of the solution annealing, the microstructure approaches the thermodynamic equilibrium so that the austenite volume content increases from 54.2 vol% to 92.7 vol%. The higher Cr and N contents result in a higher corrosion resistance of the investigated steel compared to PBF-LB/M-processed X2CrNiMo17-12-2, regarded as the reference material. In addition, the measured strengths are significantly higher due to the larger amounts of austenite/ferrite interfaces and the N-induced solid-solution strengthening effect compared to X2CrNiMo17-12-2.

在这项工作中，针对 PBF-LB/M（粉末床熔融激光束/金属）推导出了一种具有铁素体-奥氏体微观结构的不锈钢的新型合金设计。该合金是基于 X2CrNiMo17-12-2 钢开发的，其奥氏体体积含量约为 PBF-LB/M 状态下的 54 vol% 是使用减少的 Ni 等效物实现的。用 Mn 部分取代 Ni 增加了合金的 N 溶解度。通过在N ₂气氛中熔化并进一步气体雾化该熔体，使所制造的钢粉中的N含量为0.27质量％。这导致 PBF-LB/M 处理钢具有高强度和高耐腐蚀性。然而，PBF-LB/M 状态的显微组织研究证实了由铁素体、奥氏体以及富含钼和铬的 M ₂氮化物组成的微观结构N型。PBF-LB/M 样品的后续热处理并未完全消除氮化物。由于固溶退火，显微组织接近热力学平衡，因此奥氏体体积含量从 54.2 vol% 增加到 92.7 vol%。与作为参考材料的 PBF-LB/M 处理的 X2CrNiMo17-12-2 相比，较高的 Cr 和 N 含量导致所研究钢的耐腐蚀性更高。此外，与 X2CrNiMo17-12-2 相比，由于大量的奥氏体/铁素体界面和 N 诱导的固溶强化效应，测得的强度显着更高。