Stern, FelixBecker, LouisCui, ChengsongTenkamp, JochenUhlenwinkel, VolkerSteinbacher, MatthiasBoes, JohannesLentz, JonathanFechte-Heinen, RainerWeber, SebastianWalther, Frank2024-02-062024-02-062022-08-02http://hdl.handle.net/2003/42304http://dx.doi.org/10.17877/DE290R-24141Nitrogen (N) in steels can improve their mechanical strength by solid solution strengthening. Processing N-alloyed steels with additive manufacturing, here laser powder bed fusion (PBF-LB), is challenging as the N-solubility in the melt can be exceeded. This degassing of N counteracts its intended positive effects. Herein, the PBF-LB processed 316L stainless steel with increased N-content is investigated and compared to PBF-LB 316L with conventional N-content. The N is introduced into the steel by nitriding the powder and mixing it with the starting powder to achieve an N-content of approximately 0.16 mass%. Thermodynamic calculations for maximum solubility to avoid N outgassing and pore formation under PBF-LB conditions are performed beforehand. Based on the results, a higher defect tolerance under fatigue characterized by Murakami model can be achieved without negatively influencing the PBF-LB processability of the 316L steel. The increased N-content leads to higher hardness (+14%), yield strength (+16%), tensile strength (+9%), and higher failure stress in short time fatigue test (+16%).enAISI 316LDefect toleranceFatigue behaviorLaser powder bed fusionNitrogen alloying660TextSelektives LaserschmelzenAustenitischer StahlStickstoffLegierenMaterialermüdung