@article{Sghaier:15259,
      recid = {15259},
      author = {Sghaier, Thabet A. M. and Sahlaoui, Habib and Mabrouki,  Tarek and Sallem, Haifa and Rech, Joël},
      title = {A comparative study on microstructure and mechanical  properties of 17-4PH processed by a laser powder bed fusion  vs rolling process},
      publisher = {Springer Nature},
      journal = {Progress in Additive Manufacturing},
      address = {Berlin, Germany. 2024-10},
      number = {ARTICLE},
      pages = {17 p.},
      abstract = {This study provides a comprehensive benchmark comparison  of microstructure, mechanical properties, and their  evolution during subsequent heat treatment of 17-4PH  Martensitic stainless steel (MSS) processed by laser powder  bed fusion (LPBF) and its commercially rolled counterparts.  The results reveal that LPBF samples exhibit a finer  martensitic microstructure with presence of structural  defects, pores, and some non-metallic inclusions randomly  distributed at the grain boundaries and within the grains  and an almost absence of austenite, compared to rolled  samples. Additionally, after identical heat treatment, LPBF  samples maintain a relatively unchanged microstructure  while aging of rolled samples leads to a reduction in  martensite in favor of austenite and Cu- and Si-rich  precipitates. The LPBF samples demonstrate slightly  elevated hardness (HV0.5 + 20%), mechanical strength  (UTS + 15%) compared to rolled ones. Nevertheless, LPBF  samples display a distinct behavior, characterized by  abrupt fracture and reduced elongation at failure (El% max.  4% vs. 17.5%). Specifically, failure in LPBF samples is  attributed to cleavage and cavities’ coalescence  contrasting with the progressive failure mechanism observed  in rolling ones driven by plasticity and damage evolution.  Furthermore, the impact resistance of LPBF samples is  notably weak (K max. 12.5 J/cm2 vs. 155 J/cm2), which is  likely caused by macro- and microstructural defects  generated by the LPBF process and the nucleation of harmful  precipitates. The study proposes that the ductility of LPBF  samples could be improved by implementing appropriate heat  treatment and reducing defects through parameter  optimization and by specific thermal cycle control during  the LPBF process.},
      url = {http://arodes.hes-so.ch/record/15259},
      doi = {https://doi.org/10.1007/s40964-024-00837-0},
}