Powder bed fusion of high-Mn-N Ni-free austenitic stainless steel: achieving low porosity and high mechanical strength through process parameter selection

The emergence of innovative high-performance stainless steels is essential at the forefront of material science. This research highlights the meticulous development of a novel high-Mn-N Ni-free austenitic stainless steel via the powder bed fusion laser–based (PBF-LB) technique. We strategically opti...

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Bibliographic Details
Published in:	International journal of advanced manufacturing technology Vol. 131; no. 3-4; pp. 1377 - 1396
Main Authors:	Tochiro, Leandro Akira, Gabriel, André Henrique Guimarães, Terada, Maysa, de Castro, Renato Spacini, Lopes, Éder Sócrates Najar, Avila, Julian Arnaldo, Masoumi, Mohammad
Format:	Journal Article
Language:	English
Published:	London Springer London 01-03-2024 Springer Nature B.V
Subjects:	Atomic properties Austenitic stainless steels CAE) and Design Computer-Aided Engineering (CAD Ductility Engineering Industrial and Production Engineering Lasers Manganese Mechanical Engineering Media Management Melt pools Melting Nickel Original Article Porosity Powder beds Process parameters Stainless steel Tensile strength Powder bed fusion Volumetric energy density High-Mn-N Ni-free austenitic stainless steel Porosity Additive manufacturing EBSD Dendritic cellular structure
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Summary:	The emergence of innovative high-performance stainless steels is essential at the forefront of material science. This research highlights the meticulous development of a novel high-Mn-N Ni-free austenitic stainless steel via the powder bed fusion laser–based (PBF-LB) technique. We strategically optimized the laser parameters, achieving ultralow porosity and a refined microstructure with defects under 2%. Comprehensive analysis revealed superior dendritic cellular formations at melt pool boundaries, underlining our method’s precision. Unveiling the strength of this novel steel, sample S 11 (scanning speed of 800 mm/s and laser power of 147 W) showed a remarkable tensile strength of 1190 ± 20 MPa and an impressive elongation to fracture of 35 ± 3%. Interestingly, twin formations became evident under external loads, enhancing mechanical resistance while preserving ductility. Advanced quantification methods were employed to ensure accuracy, especially for low atomic number elements, overcoming previous measurement constraints. This pioneering study introduces a game-changing austenitic Ni-free stainless steel enriched by Mn and N. It sets a new benchmark in material development and application, synergizing exceptional mechanical attributes with robust ductility.
ISSN:	0268-3768 1433-3015
DOI:	10.1007/s00170-024-13073-1