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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion

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Author(s):
Pedro Henrique Eça Rodrigues [1] ; Luiz Fernando Kultz Unti [2] ; Fábio Edson Mariani [3] ; Piter Gargarella [4] ; Osvaldo Mitsuyuki Cintho [5] ; Antonio J. Ramirez [6] ; Kahl Zilnyk [7]
Total Authors: 7
Affiliation:
[1] Instituto Tecnológico de Aeronáutica. Departamento de Materiais e Processos - Brasil
[2] Instituto Tecnológico de Aeronáutica. Departamento de Materiais e Processos - Brasil
[3] Instituto Tecnológico de Aeronáutica. Departamento de Materiais e Processos - Brasil
[4] Universidade Federal de São Carlos. Departamento de Engenharia de Materiais - Brasil
[5] Universidade Estadual de Ponta Grossa. Departamento de Engenharia de Materiais - Brasil
[6] Ohio State University. Department of Materials Science and Engineering - Estados Unidos
[7] Instituto Tecnológico de Aeronáutica. Departamento de Materiais e Processos - Brasil
Total Affiliations: 7
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 26, 2023-05-26.
Abstract

The objective of this work is to study the possibility of obtaining dense parts using water atomized AISI 316L steel powder in the L-PBF process. Despite its irregular, non-spherical, particle morphology, it has a significantly lower cost. 25 samples were produced varying the laser power and the scanning speeds to determine the optimal processing conditions. Additionally, hot isostatic pressing (HIP) was performed after the L-PBF process to further increase densification. Selected samples were subjected to microstructural characterization. The best densification results obtained were for the sample produced with the laser power of 173 W and scanning speed of 600 mm/s, where densifications close to 98% were obtained. HIP post-processing promoted increased densification of samples with closed porosity, allowing samples with densification above 95% to reach values close to 100%. HIP did not promote the closure of open pores. The results indicate that the use of water atomized AISI 316L in the L-PBF process combined with post-processing by HIP can produce dense engineering components and at the same time reduce the production costs of the manufactured components, mainly because it is a lower cost raw material when compared to the commonly used feedstock obtained by gas atomization. (AU)

FAPESP's process: 19/06679-1 - Microstructural characterization of precipitation hardening stainless steels processed by additive manufacturing
Grantee:Kahl Dick Zilnyk
Support Opportunities: Regular Research Grants
FAPESP's process: 17/27031-4 - Effect of process parameters on the metallurgical characteristics of additive-manufactured alloys
Grantee:Piter Gargarella
Support Opportunities: Research Grants - Young Investigators Grants