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<p>In the past decade, significant studies have been reported on the processing of 17-4 precipitate-hardened (PH) stainless steel (SS) using additive manufacturing (AM) for numerous engineering applications. However, limited studies have reported sandwich meta-structure-based functional prototypes processed with laser powder bed fusion (LPBF) for tunable mechanical properties. This study reports the processing of 17-4 PH SS with LPBF (based on Taguchi analysis) as a sandwich meta-structure fabricated in tensile coupons for usage as cerclage strips (with top and bottom solid layers and an intermediate layer with 03 different meta structures (Octet-truss, Weaire-Phelan, and Dodecahedron) in the neutral zone). The results suggest that, contrary to the more elongation in the case of Dodecahedron, followed by Weaire-Phelan and Octet-truss-based functional prototypes, a reverse trend was noticed for intermediate sandwich meta-structure-based functional prototypes, due to a more stable body-centred cubic (BCC) phase with a volume fraction of 0.65. The samples with the highest elongation (8.78&#xa0;mm) and less porosity (10.91%) at 303&#xa0;K were fabricated at a laser power of 120&#xa0;W, Octet-truss metastructure, 1200&#xa0;mm/s scanning speed. The results are also supported by scanning electron microscopy (SEM)–energy dispersive spectroscopy (EDS)-based thermo-mechanical calculations, melt pool analysis, solidification rate trends, and volume fraction temperature analysis.</p>

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On the Thermo-Mechanical Characterization of Additively Manufactured Sandwich Meta-Structure-Based Functional Prototypes of 17- 4 PH Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Gurwinder Singh,
  • Rupinder Singh,
  • Amrinder Pal Singh,
  • Minhaz Husain,
  • Kamaljit Singh Boparai

摘要

In the past decade, significant studies have been reported on the processing of 17-4 precipitate-hardened (PH) stainless steel (SS) using additive manufacturing (AM) for numerous engineering applications. However, limited studies have reported sandwich meta-structure-based functional prototypes processed with laser powder bed fusion (LPBF) for tunable mechanical properties. This study reports the processing of 17-4 PH SS with LPBF (based on Taguchi analysis) as a sandwich meta-structure fabricated in tensile coupons for usage as cerclage strips (with top and bottom solid layers and an intermediate layer with 03 different meta structures (Octet-truss, Weaire-Phelan, and Dodecahedron) in the neutral zone). The results suggest that, contrary to the more elongation in the case of Dodecahedron, followed by Weaire-Phelan and Octet-truss-based functional prototypes, a reverse trend was noticed for intermediate sandwich meta-structure-based functional prototypes, due to a more stable body-centred cubic (BCC) phase with a volume fraction of 0.65. The samples with the highest elongation (8.78 mm) and less porosity (10.91%) at 303 K were fabricated at a laser power of 120 W, Octet-truss metastructure, 1200 mm/s scanning speed. The results are also supported by scanning electron microscopy (SEM)–energy dispersive spectroscopy (EDS)-based thermo-mechanical calculations, melt pool analysis, solidification rate trends, and volume fraction temperature analysis.