Additive manufacturing of fatigue resistant austenitic stainless steels by understanding process-structure–property relationships

Materials Research Letters

Jonathan W. Pegues¹  Nima Shamsaei¹  Michael D. Roach² 

[1] Auburn University;University of Mississippi Medical Center;

关键词: laser beam-powder bed fusion;    crack initiation;    microstructure;    twin boundary;    cyclic deformation;   

DOI  :  10.1080/21663831.2019.1678202

来源: DOAJ

【 摘 要 】

The limited understanding of additive manufacturing process-structure–property inter-relationships raises some concerns regarding the structural reliability, which limits the adoption of this emerging technology. In this study, laser beam-powder bed fusion is leveraged to fabricate an austenitic stainless steel with a microstructure containing minimal known crack initiation features. Ex-situ microstructural observations of the crack initiation features and mechanisms are carried out for interrupted fatigue tests via electron backscatter diffraction mapping of the micro-cracks. Results show that the additive manufactured stainless steel alloy has improved fatigue resistance compared to its wrought counterpart as a result of the unique microstructural features.

【 授权许可】

Unknown