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Mechanical and microstructural assessment of additive manufacturing parts made up of 18%Ni Maraging 300 steel towards aeronautic application.


The aeronautical industry requires a technological maturity from new fabrication processes intended to become part of the productive process of planes. Additive manufacturing (AM) of parts made in steel could offer several solutions in this industry (e.g. structural parts, fundamental parts in engines and turbines), envisioning of parts redesign or creation prioritizing weight reduction. However, a better understanding between microstructural and mechanical properties of AM parts need to be reached. In addition, the search for materials with environmental sustainability is a strategic pillar of the aeronautical industry. Regarding structural applications, the 18%Ni Maraging 300 (18Ni300M) steel stand out among the commercialized steels, providing high mechanical strength (>2000 MPa) and good fracture toughness (80 MPa m0,5). Parts made of 18Ni300M by AM lost toughness and mainly strain capacity when compared to similar steel fabricated by conventional forging. The causes of this behavior are the heterogeneity of the microstructure and segregations presence. Therefore, this project aims to increase fracture toughness and strain capacity without affecting the standard mechanical strength of standard samples made by AM in the 18Ni300M steel. To achieve this objective, solution, intercritical and aging physical-thermal treatments are going to be performed foreseeing a better understanding of the microstructural evolution in each treatment stage. Thus, new routes of thermal treatments will be proposed. The in-situ tests are going to be performed in a physical simulator with an X-ray diffraction facility from a synchrotron source. The microstructure will be studied using microscopy and mechanical properties will be assessed by tensile and fracture toughness tests. Finally, the environmental impacts of the produced samples will be studied by the life cycle assessment (LCA) technique. (AU)

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Scientific publications (7)
(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)
CONDE, F. F.; ESCOBAR, J. D.; OLIVEIRA, J. P.; JARDINI, A. L.; BOSE FILHO, W. W.; AVILA, J. A.. Austenite reversion kinetics and stability during tempering of an additively manufactured maraging 300 steel. ADDITIVE MANUFACTURING, v. 29, . (14/20844-1, 19/00691-0, 17/17697-5)
MELO FEITOSA, ANA LARISSA; ESCOBAR, JULIAN; RIBAMAR, GIOVANI GONCALVES; AVILA, JULIAN ARNALDO; PADILHA, ANGELO FERNANDO. Direct Observation of Austenite Reversion During Aging of 18Ni (350 Grade) Maraging Steel Through In-Situ Synchrotron X-Ray Diffraction. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 53, n. 2, . (17/17697-5, 18/21251-5)
CONDE, FABIO FARIA; ESCOBAR, JULIAN DAVID; RODRIGUEZ, JOHNNATAN; AFONSO, CONRADO RAMOS MOREIRA; OLIVEIRA, MARCELO FALCAO; AVILA, JULIAN ARNALDO. Effect of Combined Tempering and Aging in the Austenite Reversion, Precipitation, and Tensile Properties of an Additively Manufactured Maraging 300 Steel. Journal of Materials Engineering and Performance, v. 30, n. 7, SI, p. 4925-4936, . (17/17697-5, 19/00691-0)
CONDE, F. F.; AVILA, J. A.; OLIVEIRA, J. P.; SCHELL, N.; OLIVEIRA, M. F.; ESCOBAR, J. D.. Effect of the as-built microstructure on the martensite to austenite transformation in a 18Ni maraging steel after laser-based powder bed fusion. ADDITIVE MANUFACTURING, v. 46, . (17/17697-5, 19/00691-0)
CONDE, F. F.; ESCOBAR, J. D.; OLIVEIRA, J. P.; BERES, M.; JARDINI, A. L.; BOSE, W. W.; AVILA, J. A.. Effect of thermal cycling and aging stages on the microstructure and bending strength of a selective laser melted 300-grade maraging steel. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 758, p. 192-201, . (17/17697-5)
SANTOS, PEDRO L. L.; AVILA, JULIAN A.; DA FONSECA, EDUARDO B.; GABRIEL, ANDRE H. G.; JARDINI, ANDRE L.; LOPES, EDER S. N.. Plane-strain fracture toughness of thin additively manufactured maraging steel samples. ADDITIVE MANUFACTURING, v. 49, . (17/17697-5)
ESCOBAR, J. D.; DELFINO, P. M.; ARIZA-ECHEVERRI, E. A.; CARVALHO, F. M.; SCHELL, N.; STARK, A.; RODRIGUES, T. A.; OLIVEIRA, J. P.; AVILA, J. A.; GOLDENSTEIN, H.; et al. Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel. MATERIALS CHARACTERIZATION, v. 182, . (18/21251-5, 17/17697-5, 19/00691-0)

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