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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel

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Escobar, J. D. [1] ; Delfino, P. M. [1] ; Ariza-Echeverri, E. A. [1, 2] ; Carvalho, F. M. [3] ; Schell, N. [4] ; Stark, A. [4] ; Rodrigues, T. A. [5] ; Oliveira, J. P. [5] ; Avila, J. A. [6] ; Goldenstein, H. [1] ; Tschiptschin, A. P. [1]
Total Authors: 11
[1] Univ Sao Paulo, Met & Mat Engn Dept, Av Prof Mello Moraes 2463, Sao Paulo - Brazil
[2] Univ Tecnolag Pereira, Escuela Tecnol Mecan, Carrera 27 10-02 Alamos, Pereira - Colombia
[3] Inst Technol Res, Met Proc Lab, Av Prof Almeida Prado 532, Sao Paulo - Brazil
[4] Helmholtz Zentrum Hereon, Inst Mat Phys, Max Planck Str 1, D-21502 Geesthacht - Germany
[5] Univ NOVA Lisboa, NOVA Sch Sci & Technol, Dept Mech & Ind Engn, UNIDEMI, P-2829516 Caparica - Portugal
[6] Sao Paulo State Univ, UNESP, Campus Sao Joao da Boa Vista, Sao Joao Da Boa Vista, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Web of Science Citations: 0

Understanding the kinetics of microstructural degradation during the event of a fire is of major relevance to future optimization of fire-resistant steels (FRS). In this work, we use in situ synchrotron X-ray diffraction to assess the rapid thermally-assisted degradation of different starting microstructures, such as (i) ferrite + pearlite; (ii) bainite + retained austenite, and (iii) martensite + retained austenite, during the simulation of a fire cycle in a Fe-0.13C-0.11Cr-0.38Mo-0.04V FRS. Our results show that retained austenite is the most unstable phase, especially when generated by faster cooling rates, decomposing at temperatures as low as 180 degrees C during fire simulations. Bainite and martensite are both unstable and undergo recovery and carbon desaturation via secondary precipitation of cementite. However, bainite is comparatively more stable than martensite since its decomposition starts at 400 degrees C, while for martensite it occurs at 320 degrees C. We also present a methodology to deconvolute the effect of temperature on the increased background and signal intensities of the X-ray spectra, allowing the direct observation of the kinetics of secondary cementite precipitation. (AU)

FAPESP's process: 18/21251-5 - Characterization of the temperature-activated secondary hardening effect of fire-resistant steels during fire simulations
Grantee:Julian David Escobar Atehortua
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 17/17697-5 - Mechanical and microstructural assessment of additive manufacturing parts made up of 18%Ni Maraging 300 steel towards aeronautic application.
Grantee:Julian Arnaldo Avila Diaz
Support type: Regular Research Grants
FAPESP's process: 19/00691-0 - Microstructural assessment of additive manufacturing parts towards aeronautic application
Grantee:Julian Arnaldo Avila Diaz
Support type: Regular Research Grants