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Tabin J., Kawałko J.♦, Schob D.♦, Roszak R.♦, Brodecki A., Bała P.♦, Maasch P.♦, Kowalewski Z. L., Ziegenhorn M.♦, Deformation-induced martensitic transformation in fused filament fabrication austenitic stainless steels during tension at wide range of temperatures (77 K, RT),
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2025.149552, Vol.950, No.149552, pp.1-13, 2025 Abstract:
This study investigates the mechanical behaviour of fused filament fabrication (FFF) of 316L austenitic stainless steel compared to conventional 316L at room temperature and 77 K, focusing on deformation-induced martensitic transformation (DIMT). Results reveal that the Lüders-like effect, present in conventional 316L at 77 K, is absent in FFF 316L due to porosities that hinder martensitic front propagation. At room temperature, uniform strain distribution and DIMT were observed in conventional 316L, whereas in FFF 316L, martensitic nucleation occurred around pores, serving as a localized strengthening mechanism. Microstructural analysis identified Fe-δ islands along grain boundaries in FFF 316L, which contribute to its multiphase nature. Although FFF 316L demonstrates lower yield stress and elongation compared to conventional 316L, this study does not establish design allowables. The present findings are limited to monotonic tensile behaviour, fatigue performance and corrosion resistance under cryogenic conditions were not assessed. Further optimization of fabrication parameters to minimize ferrite content and porosities is suggested to enhance mechanical performance Keywords:
TRIP effect, Fused filament fabrication, 316L, Cryogenic temperatures, Microstructure Affiliations:
| Tabin J. | - | IPPT PAN | | Kawałko J. | - | other affiliation | | Schob D. | - | other affiliation | | Roszak R. | - | other affiliation | | Brodecki A. | - | IPPT PAN | | Bała P. | - | AGH University of Science and Technology (PL) | | Maasch P. | - | other affiliation | | Kowalewski Z. L. | - | IPPT PAN | | Ziegenhorn M. | - | other affiliation |
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