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A comparative study of the microstructural stability and magnetic properties of two Fe-Mn-C (1,5%Mn and 17%Mn) steels

Grant number: 15/26409-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2016
Effective date (End): October 31, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Maria Jose Ramos Sandim
Grantee:Isnaldi Rodrigues de Souza Filho
Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
Associated scholarship(s):17/17170-7 - Advanced microstructural characterization of two Fe-Mn-C steel grades (1.5 Mn wt-perc. and 17 Mn wt-perc.) in different metallurgical conditions, BE.EP.DR


In this project, the microstructural evolution and magnetic properties of two Fe-Mn-C (1,5%Mn and 17%Mn) steels will be investigated. For these steels the TRIP effect (Transformation-Induced Plasticity) is expected to occur with high intensity for the one with lower content of manganese. The main focus of this work will be on the strain induced martensite (and its reversion). Besides, the thermally induced martensite will be also investigated. The two steels will be cold rolled and, in addition, annealed at high temperatures (up to 1000oC). The samples will be characterized using Vickers microhardness tests, conventional X-ray diffraction (macrotexture), light optical microscopy (LOM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), dilatometry, and both ex situ and in situ magnetic measurements. The in situ magnetic measurements will be obtained during the annealing and cooling of the material (up to cryogenic temperatures). From the magnetic measurements, besides de saturation magnetization (Ms), the behavior of the coercive field (Hc) will be also evaluated. Possible anisotropy effects in the martensite induced by rolling will be also investigated using dilatometry and magnetic measurements. In situ X-ray diffraction will be also performed during uniaxial tensile deformation of the material in order to evaluate the phase transformation induced by plastic deformation. The analysis of the undeformed material using EBSD and ARPGE software will lead to the reconstruction of the parent austenite grain structure.

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Scientific publications
(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)
SOUZA FILHO, I. R.; SANDIM, M. J. R.; PONGE, D.; SANDIM, H. R. Z.; RAABE, D.. Strain hardening mechanisms during cold rolling of a high-Mn steel: Interplay between submicron defects and microtexture. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 754, p. 636-649, . (17/04444-1, 15/26409-8, 17/17170-7)
SOUZA FILHO, I. R.; DUTTA, A.; ALMEIDA JUNIOR, JR., D. R.; LU, W.; SANDIM, M. J. R.; PONGE, D.; SANDIM, H. R. Z.; RAABE, D.. The impact of grain-scale strain localization on strain hardening of a high-Mn steel: Real-time tracking of the transition from the gamma -> epsilon -> alpha ` transformation to twinning. ACTA MATERIALIA, v. 197, p. 123-136, . (17/17170-7, 15/26409-8)
SOUZA FILHO, I. R.; DA SILVA, A. KWIATKOWSKI; SANDIM, M. J. R.; PONGE, D.; GAULT, B.; SANDIM, H. R. Z.; RAABE, D.. Martensite to austenite reversion in a high-Mn steel: Partitioning-dependent two-stage kinetics revealed by atom probe tomography, in-situ magnetic measurements and simulation. ACTA MATERIALIA, v. 166, p. 178-191, . (17/04444-1, 15/26409-8, 17/17170-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SOUZA FILHO, Isnaldi Rodrigues de. Phase transformations in a high-Mn steel: strain hardening mechanisms, austenite reversion, and athermal martensitic transformation. 2019. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de Lorena (EEL/ASDI) Lorena.

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