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  Magnetic properties of a 17.6 Mn-TRIP steel: Study of strain-induced martensite formation, austenite reversion, and athermal α′-formation

Souza Filho, I. R., Sandim, M. J. R., Cohen, R., Nagamine, L. C. M., Sandim, H. R. Z., & Raabe, D. (2019). Magnetic properties of a 17.6 Mn-TRIP steel: Study of strain-induced martensite formation, austenite reversion, and athermal α′-formation. Journal of Magnetism and Magnetic Materials, 473, 109-118. doi:10.1016/j.jmmm.2018.10.034.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-E7C3-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E7C4-A
Genre: Journal Article

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 Creators:
Souza Filho, Isnaldi R.1, 2, Author              
Sandim, Maria José Ramos3, Author              
Cohen, Renato4, Author              
Nagamine, Luiz Carlos M.4, Author              
Sandim, Hugo Ricardo Zschommler3, Author              
Raabe, Dierk2, Author              
Affiliations:
1Lorena School of Engineering, University of Sao Paulo, 12602-810, Lorena, Brazil, ou_persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, 12600-970, Brazil, ou_persistent22              
4Instituto de Física, University of Sao Paulo, 05314-970 Sao Paulo, Brazil, ou_persistent22              

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Free keywords: Austenite; Cold rolling; Magnetic anisotropy; Magnetic properties; Magnetic variables measurement; Magnetism; Martensite; Phase transitions; Plasticity; Temperature, Austenite reversion; Continuous annealing; Electron channeling contrasts; High resolution electron backscatter diffractions; Magnetic shape anisotropies; Strain-induced martensite; Thermodynamic simulations; TRIP-steel, High strength steel
 Abstract: Strain-induced martensite (SIM) formation was evaluated upon cold-rolling of a 17.6 wt.Mn-TRIP steel by means of magnetic measurements, X-ray diffraction, and high-resolution electron backscatter diffraction (EBSD). α′-martensite formation was observed to be dependent on the presence of prior ε-martensite. Upon deformation, the coercivity of the ferromagnetic α′-martensite is characterized by strong magnetic shape anisotropy. Austenite (γ) reversion was evaluated by means of in situ magnetic measurements during continuous annealing. The experimental results were compared to thermodynamic simulations. It turned out that γ-reversion was not completed in the regime where a γ-single phase field is expected, which suggests the splitting of α′ → γ transformation into two stages. The Curie temperature of remaining α′-martensite was determined as being ∼620 °C. Magnetic properties presented an annealing time-dependence within the temperature range of 500–600 °C, suggesting long-range diffusional α′ → γ transformation. With the aid of electron channeling contrast image technique (ECCI), we noticed that the formation of γ-nanograins in the early stages of reversion is sufficient to induce strong magnetic shape anisotropy in this steel. After full austenitization at 800 °C, further in situ magnetic measurements were also used to track the magnetic response of the material upon controlled cooling. Athermal formation of α′-martensite within the prior athermal ε-phase was clearly observed for temperatures lower than 100 °C. Using thermodynamic modeling we also calculated the start temperature for ε-formation (Ms ε). Results showed that ε-martensite is indeed expected to form before α′ which was confirmed in all cases by means of EBSD. © 2018 Elsevier B.V.

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Language(s): eng - English
 Dates: 2019-03-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jmmm.2018.10.034
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Pages: - Volume / Issue: 473 Sequence Number: - Start / End Page: 109 - 118 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464