PSI - Issue 74

ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 74 (2025) 1–8

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pantělejev © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ě lejev Abstract Laser-powder bed fusion (L- PBF) is an efficient and advanced manufacturing technology that utilizes a laser to melt and solidify metallic alloy powders, layer by layer, to form the desired object shape. Among numerous L-PBF processing parameters, four basic parameters are vital for the quality of the final product, namely laser power (P), scanning speed (v), layer thickness (t), and hatch spacing (h). Another essential parameter, usually not considered in abundant studies on L-PBF 316L stainless steel, is the chemical composition of the used powders. This study addresses the crucial importance of the chemical composition of the feedstock powder on the microstructural characteristics (shape and size of grains, grai n boundary types, texture, solidification/dislocation cells, etc.) of SLM 316L stainless steels. Using various advanced microscopic techniques, it is demonstrated that even very slight variations in the chemical composition of powders from different producers, still within allowable ranges, manufactured using identical processing parameters and conditions, result in a change of solidification mode that significantly impacts the final microstructure and mechanical performance of L-PBF 316L stainless steel. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ě lejev Eleventh International Conference on Materials Structure and Micromechanics of Fracture Impact of chemical composition on solidification microstructure and hardness of additively manufactured 316L steel Jaromír Brůža a,b * , Vít Kroužecký c , Veronika Mazánová a , Miroslav Šmíd a , Michal Jambor a , Majid Laleh d,e , Anthony E. Hughes f , Ivana Zetková c , Jiří Man a a Institute of Physics of Materials ASCR, Žižkova 513/22, Brno 616 00, Czech Republic b Institute of Material Sciences and Engineering, Faculty of Mechanical En gineering, Brno University of Technology, Technická 2896/2, Brno 616 69, Czech Republic c Regional Technological Institute, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitní 2762/22, Pilsen 301 00, Czech Republic d Electron Microsc opy Centre, University of Wollongong, New South Wales 2500, Australia Abstract Laser-powder bed fusion (L- PBF) is an efficient and advanced manufacturing technology that utilizes a laser to melt and solidify metallic alloy powders, layer by layer, to form the desired object shape. Among numerous L-PBF processing parameters, four basic parameters are vital for the quality of the final product, namely laser power (P), scanning speed (v), layer thickness (t), and hatch spacing (h). Another essential parameter, usually not considered in abundant studies on L-PBF 316L stainless steel, is the chemical composition of the used powders. This study addresses the crucial importance of the chemical composition of the feedstock powder on the microstructural characteristics (shape and size of grains, grai n boundary types, texture, solidification/dislocation cells, etc.) of SLM 316L stainless steels. Using various advanced microscopic techniques, it is demonstrated that even very slight variations in the chemical composition of powders from different producers, still within allowable ranges, manufactured using identical processing parameters and conditions, result in a change of solidification mode that significantly impacts the final microstructure and mechanical performance of L-PBF 316L stainless steel. Eleventh International Conference on Materials Structure and Micromechanics of Fracture Impact of chemical composition on solidification microstructure and hardness of additively manufactured 316L steel Jaromír Brůža a,b * , Vít Kroužecký c , Veronika Mazánová a , Miroslav Šmíd a , Michal Jambor a , Majid Laleh d,e , Anthony E. Hughes f , Ivana Zetková c , Jiří Man a a Institute of Physics of Materials ASCR, Žižkova 513/22, Brno 616 00, Czech Republic b Institute of Material Sciences and Engineering, Faculty of Mechanical En gineering, Brno University of Technology, Technická 2896/2, Brno 616 69, Czech Republic c Regional Technological Institute, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitní 2762/22, Pilsen 301 00, Czech Republic d Electron Microsc opy Centre, University of Wollongong, New South Wales 2500, Australia e ARC Research Hub for Australian Steel Innovation, University of Wollongong, Wollongong, NSW 2522, Australia f Institute of Frontier Materials, Deakin University, 75 Pigdons Rd., Waurn Ponds, Geelong 3216, VIC, Australia e ARC Research Hub for Australian Steel Innovation, University of Wollongong, Wollongong, NSW 2522, Australia f Institute of Frontier Materials, Deakin University, 75 Pigdons Rd., Waurn Ponds, Geelong 3216, VIC, Australia

Keywords: L-PBF; Stainless steel; 316L; Solidification modes; Microstructure; EBSD; Hardness Keywords: L-PBF; Stainless steel; 316L; Solidification modes; Microstructure; EBSD; Hardness

* Corresponding author. Tel.: +420 532 290 345 E- mail address: bruza@ipm.cz * Corresponding author. Tel.: +420 532 290 345 E- mail address: bruza@ipm.cz

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pantělejev 10.1016/j.prostr.2025.10.026 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ě lejev 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ě lejev