Microstructural stability of 316L stainless steel processed via selective laser melting using different scanning strategies

• Grant number: 18/23582-9
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2019
• End date: July 31, 2021
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Hugo Ricardo Zschommler Sandim
• Grantee: Leonardo Shoji Aota
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
• Associated scholarship(s): 19/19442-0 - Microstructural stability of AISI 316L stainless steel processed by selective laser melting using different scanning strategies, BE.EP.MS

Abstract

This project aims to evaluate the microstructural stability of AISI 316L austenitic stainless-steel samples processed by selective laser melting (SLM) by choosing four different scanning strategies. In most cases, the printed parts need to be heat treated after processing due to the high residual stresses developed upon processing. The materials processed by this additive manufacturing technique have unique microstructures that vary according to the processing conditions, in particular their dislocation density, depending on the adopted scanning strategy. The samples were processed via SLM and are already available for this study. The materials will be characterized in the "as-processed" condition and after isothermal annealing at 1150°C with emphasis on texture evolution upon static recrystallization. The microstructural characterization will be carried out by means of residual stress measurements in the "as-processed" condition using X-ray diffraction, Vickers microhardness testing and optical and scanning electron microscopy. The corresponding dislocations densities will be evaluated by using two distinct approaches: quantitative metallography from contrast electron channeling images (ECCI) and X-ray diffraction using the Williamson-Hall modified method. Microtexture will be evaluated by electron backscatter diffraction (EBSD) techniques. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

AOTA, LEONARDO SHOJI; SOUZA FILHO, ISNALDI R.; ROSCHER, MORITZ; PONGE, DIRK; ZSCHOMMLER SANDIM, HUGO RICARDO. Strain hardening engineering via grain size control in laser powder-bed fusion. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 838, p. 12-pg., 2022-03-24. (17/02485-2, 19/19442-0, 18/23582-9)

AOTA, LEONARDO SHOJI; BAJAJ, PRIYANSHU; ZILNYK, KAHL DICK; JAEGLE, ERIC AIME; PONGE, DIRK; SANDIM, HUGO RICARDO ZSCHOMMLER; RAABE, DIERK. Recrystallization kinetics, mechanisms, and topology in alloys processed by laser powder-bed fusion: AISI 316L stainless steel as example. MATERIALIA, v. 20, DEC 2021. (19/19442-0, 18/23582-9, 19/06679-1)

AOTA, LEONARDO SHOJI; BAJAJ, PRIYANSHU; ZILNYK, KAHL DICK; PONGE, DIRK; SANDIM, HUGO RICARDO ZSCHOMMLER. The origin of abnormal grain growth upon thermomechanical processing of laser powder-bed fusion alloys. MATERIALIA, v. 20, DEC 2021. (18/23582-9, 19/19442-0)

UNTI, L. F. KULTZ; AOTA, L. S.; JARDINI, A. L.; TSCHIPTSCHIN, A. P.; SANDIM, H. R. Z.; JAEGLE, E. A.; ZILNYK, K. D.. Microstructural characterization of 15-5PH stainless steel processed by laser powder-bed fusion. MATERIALS CHARACTERIZATION, v. 181, NOV 2021. (18/23582-9, 19/19442-0, 19/06679-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

AOTA, Leonardo Shoji. Microstructure of AISI 316L austenitic stainless steel processed by laser powderbed fusion with different scanning strategies and its evolution upon annealing and thermomechanical processing. 2021. Master's Dissertation - Universidade de São Paulo (USP). Escola de Engenharia de Lorena (EEL/ASDI) Lorena.