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Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling

Investigations by electron backscatter diffraction (EBSD) and X-ray diffraction with the use of synchrotron radiation, as well as parallel extended finite element (XFEM) simulations, reveal the evolution of the 316L stainless steel microstructure in the vicinity of a macro-crack developing at the te...

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Autores principales: Nalepka, Kinga, Skoczeń, Błażej, Ciepielowska, Marlena, Schmidt, Rafał, Tabin, Jakub, Schmidt, Elwira, Zwolińska-Faryj, Weronika, Chulist, Robert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795462/
https://www.ncbi.nlm.nih.gov/pubmed/33396788
http://dx.doi.org/10.3390/ma14010127
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author Nalepka, Kinga
Skoczeń, Błażej
Ciepielowska, Marlena
Schmidt, Rafał
Tabin, Jakub
Schmidt, Elwira
Zwolińska-Faryj, Weronika
Chulist, Robert
author_facet Nalepka, Kinga
Skoczeń, Błażej
Ciepielowska, Marlena
Schmidt, Rafał
Tabin, Jakub
Schmidt, Elwira
Zwolińska-Faryj, Weronika
Chulist, Robert
author_sort Nalepka, Kinga
collection PubMed
description Investigations by electron backscatter diffraction (EBSD) and X-ray diffraction with the use of synchrotron radiation, as well as parallel extended finite element (XFEM) simulations, reveal the evolution of the 316L stainless steel microstructure in the vicinity of a macro-crack developing at the temperature of liquid helium (4.2 K). The fracture propagation induces a dynamic, highly localized phase transformation of face-centred cubic austenite into α’ martensite with a body-centred cubic structure. Synchrotron studies show that the texture of the primary phase controls the transition process. The austenite grains, tending to the stable Brass orientation, generate three mechanisms of the phase transformation. EBSD studies reveal that the secondary phase particles match the ordered austenitic matrix. Hence, interphase boundaries with the Pitsch disorientation are most often formed and α’ martensite undergoes intensive twinning. The XFEM simulations, based on the experimentally determined kinetics of the phase transformation and on the relevant constitutive relationships, reveal that the macro-crack propagates mainly in the martensitic phase. Synchrotron and EBSD studies confirm the almost 100% content of the secondary phase at the fracture surface. Moreover, they indicate that the boundaries formed then are largely random. As a result, the primary beneficial role of martensite as reinforcing particles is eliminated.
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spelling pubmed-77954622021-01-10 Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling Nalepka, Kinga Skoczeń, Błażej Ciepielowska, Marlena Schmidt, Rafał Tabin, Jakub Schmidt, Elwira Zwolińska-Faryj, Weronika Chulist, Robert Materials (Basel) Article Investigations by electron backscatter diffraction (EBSD) and X-ray diffraction with the use of synchrotron radiation, as well as parallel extended finite element (XFEM) simulations, reveal the evolution of the 316L stainless steel microstructure in the vicinity of a macro-crack developing at the temperature of liquid helium (4.2 K). The fracture propagation induces a dynamic, highly localized phase transformation of face-centred cubic austenite into α’ martensite with a body-centred cubic structure. Synchrotron studies show that the texture of the primary phase controls the transition process. The austenite grains, tending to the stable Brass orientation, generate three mechanisms of the phase transformation. EBSD studies reveal that the secondary phase particles match the ordered austenitic matrix. Hence, interphase boundaries with the Pitsch disorientation are most often formed and α’ martensite undergoes intensive twinning. The XFEM simulations, based on the experimentally determined kinetics of the phase transformation and on the relevant constitutive relationships, reveal that the macro-crack propagates mainly in the martensitic phase. Synchrotron and EBSD studies confirm the almost 100% content of the secondary phase at the fracture surface. Moreover, they indicate that the boundaries formed then are largely random. As a result, the primary beneficial role of martensite as reinforcing particles is eliminated. MDPI 2020-12-30 /pmc/articles/PMC7795462/ /pubmed/33396788 http://dx.doi.org/10.3390/ma14010127 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Nalepka, Kinga
Skoczeń, Błażej
Ciepielowska, Marlena
Schmidt, Rafał
Tabin, Jakub
Schmidt, Elwira
Zwolińska-Faryj, Weronika
Chulist, Robert
Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title_full Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title_fullStr Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title_full_unstemmed Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title_short Phase Transformation in 316L Austenitic Steel Induced by Fracture at Cryogenic Temperatures: Experiment and Modelling
title_sort phase transformation in 316l austenitic steel induced by fracture at cryogenic temperatures: experiment and modelling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795462/
https://www.ncbi.nlm.nih.gov/pubmed/33396788
http://dx.doi.org/10.3390/ma14010127
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