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Characterization and evaluation of the microstructural stability of AISI 316L stainless steel processed via selective laser melting


The present project aims at characterizing and evaluating the microstructural stability of the AISI 316L austenitic stainless steel processed by selective laser melting (SLM) of metal powders. The materials processed by this additive manufacturing technique display unique microstructures which vary according to the processing conditions and differ completely from those obtained via conventional manufacturing processes. To date, the literature presents very little information on the microstructural stability of these materials, and still less on the material that will be used in this study. This scenario, together with the increasing perspectives of industrial applications of this processing route, justify the accomplishment of this work. Experimental activities comprise the fabrication of specimens of this steel by SLM. The material will be characterized in the "as-processed" condition and after isothermal annealing within a wide range of temperatures (300-1150oC), with emphasis on the evolution of the crystallographic texture during microstructural coarsening and identification of the underlying mechanisms. The microstructural characterization comprises measurements of residual strain, Vickers microhardness testing, light optical microscopy and scanning electron microscopy in backscattered electrons mode. Both texture and microtexture will be characterized by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) techniques. (AU)

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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; BAJAJ, PRIYANSHU; SANDIM, HUGO RICARDO ZSCHOMMLER; JAEGLE, ERIC AIME. Laser Powder-Bed Fusion as an Alloy Development Tool: Parameter Selection for In-Situ Alloying Using Elemental Powders. MATERIALS, v. 13, n. 18, . (17/02485-2)
PINTO, F. C.; AOTA, L. S.; SOUZA FILHO, I. R.; RAABE, D.; SANDIM, H. R. Z.. Recrystallization in non-conventional microstructures of 316L stainless steel produced via laser powder-bed fusion: effect of particle coarsening kinetics. Journal of Materials Science, v. 57, n. 21, p. 23-pg., . (19/19442-0, 17/02485-2)
PINTO, F. C.; SOUZA FILHO, I. R.; SANDIM, M. J. R.; SANDIM, H. R. Z.. Defects in parts manufactured by selective laser melting caused by delta-ferrite in reused 316L steel powder feedstock. ADDITIVE MANUFACTURING, v. 31, . (17/02485-2)
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., . (17/02485-2, 19/19442-0, 18/23582-9)

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