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Microstructural characterization of precipitation hardening stainless steels processed by additive manufacturing

Abstract

Additive Manufacturing is a materials processing technique that has been developing rapidly and gaining industrial relevance. Precipitation-hardening (PH) stainless steels combine high mechanical strength with good corrosion resistance and therefore find specific applications in several industrial segments. Due to the high relative cost of these materials and the need to produce components with complex geometry in small batches, PH stainless steels are excellent candidates to be processed by Additive Manufacturing techniques such as selective laser melting (SLM). However, a better understanding of the microstructure and the resulting properties of this technique is still necessary. The objective of this research project is to characterize the microstructure of 15-5PH and 17-7PH steels processed by SLM in their as-built condition and after post-processing heat treatments. Several complementary characterization techniques will be employed: scanning electron microscopy, EBSD, X-ray diffraction, residual stress, macrotexture, potentiometry, dilatometry, hardness tests, transmission electron microscopy and atom probe tomography. Computational thermodynamic calculations, using the CALPHAD approach, will be employed to determine the optimal heat treatment conditions and to aid the study of the phase transformations during the processing and post-processing. The obtained results will have great potential for publication and may serve as parameters to assist the commercial manufacturing of structural components of PH stainless steel by means of Additive Manufacturing. (AU)

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Scientific publications (6)
(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; 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, . (19/19442-0, 18/23582-9, 19/06679-1)
ZILNYK, K. D.; SUZUKI, P. A.; SANDIM, H. R. Z.. Subtle microstructural changes during prolonged annealing of ODS-Eurofer steel. NUCLEAR MATERIALS AND ENERGY, v. 35, p. 10-pg., . (19/06679-1, 14/23304-8)
STARCK, LETICIA F.; ZILNYK, KAHL D.; SENRA, ANA L. T.; NAMUR, RICARDO S.; IZUMI, MARCEL T.; DE CASTRO, MAURICIO; MAEDA, MILENE Y.; RIGHETTI, VICTOR A. N.; RAMIREZ, ANTONIO J.; CINTHO, OSVALDO M.. In Situ x-ray Diffraction Study of the Deformation of an AISI 316L Stainless Steel Produced by Laser Powder Bed Fusion. Journal of Materials Engineering and Performance, v. 31, n. 10, p. 14-pg., . (19/06679-1)
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, . (18/23582-9, 19/19442-0, 19/06679-1)
SANDIM, M. J. R.; MAURO, V; TAVARES, S. S. M.; ZILNYK, K. D.; SANDIM, H. R. Z.. Magnetic properties and microstructural characterization of cold-rolled and annealed 317L austenitic stainless steel. Journal of Magnetism and Magnetic Materials, v. 539, . (19/06679-1)
PEDRO HENRIQUE EÇA RODRIGUES; LUIZ FERNANDO KULTZ UNTI; FÁBIO EDSON MARIANI; PITER GARGARELLA; OSVALDO MITSUYUKI CINTHO; ANTONIO J. RAMIREZ; KAHL ZILNYK. Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 26, . (17/27031-4, 19/06679-1)

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