| 1. |
Dubey V., Kopeć M., Przygucka D.♦, Pawlik M.♦, Wood P.♦, Kowalewski Z.L., Effect of the printing orientation on the yield surface and its evolution reflecting plastic pre-deformation of additively manufactured stainless steel 316L,
International Journal od Advanced Manufacturing Technology, ISSN: 0268-3768, DOI: 10.1007/s00170-025-16296-y, Vol.139, No.9-10, pp.1-22, 2025 Abstract:
This study explores the influence of printing orientation on the yield surface characteristics and their evolution under plastic pre-deformation in additively manufactured (AM) stainless steel 316L produced via laser powder bed fusion (LPBF). Tubular specimens were fabricated in three orientations (XY, ZX, and Z) and subjected to multi-axial loading to experimentally determine initial and subsequent yield surfaces using a single-specimen probing approach. The yield surfaces were derived at two offset strain definitions (0.001% and 0.005%) and further analyzed after tensile pre-deformations of 0.35%, 0.5%, and 0.8%. Results revealed strong anisotropy in the AM specimens, with the Z-oriented samples displaying the lowest yield strength and most significant softening. In contrast, the XY and ZX orientations exhibited higher resistance to plastic deformation. The wrought SS316L showed superior mechanical performance. The evolution of yield surfaces highlighted the orientation-dependent hardening/softening mechanisms and directional stress redistribution. Electron backscatter diffraction (EBSD) analysis revealed that the microstructural anisotropy and grain morphology—particularly the presence of columnar grains in the Z-oriented samples—correlate strongly with the observed mechanical anisotropy and yield surface asymmetry Keywords:
Stainless steel, Yield surface, Additive manufacturing, Laser powder bed fusion melting (LPBF-M) Affiliations:
| Dubey V. | - | IPPT PAN | | Kopeć M. | - | IPPT PAN | | Przygucka D. | - | other affiliation | | Pawlik M. | - | other affiliation | | Wood P. | - | University of Derby (GB) | | Kowalewski Z.L. | - | IPPT PAN |
|  |
| 2. |
Kopeć M., Dubey V.P., Pawlik M.♦, Wood P.♦, Kowalewski Z.L., Experimental identification of yield surface for additively manufactured stainless steel 316L under tension–compression-torsion conditions considering its printing orientation,
Manufacturing Letters, ISSN: 2213-8463, DOI: 10.1016/j.mfglet.2024.07.003, Vol.41, pp.28-32, 2024Abstract:
Stainless steel 316L tubes and bars were additively manufactured (AM) by using the Laser Powder Bed Fusion Melting (LPBF-M) method in three orientations. As-built specimens were then machined and the initial yield surface was determined for three printing orientations based on the yield stress definition for 0.005 % plastic offset strain. The as-received, wrought material was additionally tested using the same tension–compression-torsion conditions to compare the mechanical behaviour of AM and wrought SS316L. The sizes of yield surfaces elaborated for LPBF-M specimens increased along the tensile and compressive directions and shrunk when torsion was applied, as compared to the as-received specimen. Keywords:
Stainless steel ,Yield surface ,Additive manufacturing Affiliations:
| Kopeć M. | - | IPPT PAN | | Dubey V.P. | - | IPPT PAN | | Pawlik M. | - | other affiliation | | Wood P. | - | University of Derby (GB) | | Kowalewski Z.L. | - | IPPT PAN |
| |
