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Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

The combined effect of deformation temperature and strain value on the continuous cooling transformation (CCT) diagram of low-alloy steel with 0.23% C, 1.17% Mn, 0.79% Ni, 0.44% Cr, and 0.22% Mo was studied. The deformation temperature (identical to the austenitization temperature) was in the range...

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Autores principales: Schindler, Ivo, Kawulok, Rostislav, Opěla, Petr, Kawulok, Petr, Rusz, Stanislav, Sojka, Jaroslav, Sauer, Michal, Navrátil, Horymír, Pindor, Lukáš
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7696398/
https://www.ncbi.nlm.nih.gov/pubmed/33202789
http://dx.doi.org/10.3390/ma13225116
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author Schindler, Ivo
Kawulok, Rostislav
Opěla, Petr
Kawulok, Petr
Rusz, Stanislav
Sojka, Jaroslav
Sauer, Michal
Navrátil, Horymír
Pindor, Lukáš
author_facet Schindler, Ivo
Kawulok, Rostislav
Opěla, Petr
Kawulok, Petr
Rusz, Stanislav
Sojka, Jaroslav
Sauer, Michal
Navrátil, Horymír
Pindor, Lukáš
author_sort Schindler, Ivo
collection PubMed
description The combined effect of deformation temperature and strain value on the continuous cooling transformation (CCT) diagram of low-alloy steel with 0.23% C, 1.17% Mn, 0.79% Ni, 0.44% Cr, and 0.22% Mo was studied. The deformation temperature (identical to the austenitization temperature) was in the range suitable for the wire rolling mill. The applied compressive deformation corresponded to the true strain values in an unusually wide range. Based on the dilatometric tests and metallographic analyses, a total of five different CCT diagrams were constructed. Pre-deformation corresponding to the true strain of 0.35 or even 1.0 had no clear effect on the austenite decomposition kinetics at the austenitization temperature of 880 °C. During the long-lasting cooling, recrystallization and probably coarsening of the new austenitic grains occurred, which almost eliminated the influence of pre-deformation on the temperatures of the diffusion-controlled phase transformations. Decreasing the deformation temperature to 830 °C led to the significant acceleration of the austenite → ferrite and austenite → pearlite transformations due to the applied strain of 1.0 only in the region of the cooling rate between 3 and 35 °C·s(−1). The kinetics of the bainitic or martensitic transformation remained practically unaffected by the pre-deformation. The acceleration of the diffusion-controlled phase transformations resulted from the formation of an austenitic microstructure with a mean grain size of about 4 µm. As the analysis of the stress–strain curves showed, the grain refinement was carried out by dynamic and metadynamic recrystallization. At low cooling rates, the effect of plastic deformation on the kinetics of phase transformations was indistinct.
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spelling pubmed-76963982020-11-29 Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel Schindler, Ivo Kawulok, Rostislav Opěla, Petr Kawulok, Petr Rusz, Stanislav Sojka, Jaroslav Sauer, Michal Navrátil, Horymír Pindor, Lukáš Materials (Basel) Article The combined effect of deformation temperature and strain value on the continuous cooling transformation (CCT) diagram of low-alloy steel with 0.23% C, 1.17% Mn, 0.79% Ni, 0.44% Cr, and 0.22% Mo was studied. The deformation temperature (identical to the austenitization temperature) was in the range suitable for the wire rolling mill. The applied compressive deformation corresponded to the true strain values in an unusually wide range. Based on the dilatometric tests and metallographic analyses, a total of five different CCT diagrams were constructed. Pre-deformation corresponding to the true strain of 0.35 or even 1.0 had no clear effect on the austenite decomposition kinetics at the austenitization temperature of 880 °C. During the long-lasting cooling, recrystallization and probably coarsening of the new austenitic grains occurred, which almost eliminated the influence of pre-deformation on the temperatures of the diffusion-controlled phase transformations. Decreasing the deformation temperature to 830 °C led to the significant acceleration of the austenite → ferrite and austenite → pearlite transformations due to the applied strain of 1.0 only in the region of the cooling rate between 3 and 35 °C·s(−1). The kinetics of the bainitic or martensitic transformation remained practically unaffected by the pre-deformation. The acceleration of the diffusion-controlled phase transformations resulted from the formation of an austenitic microstructure with a mean grain size of about 4 µm. As the analysis of the stress–strain curves showed, the grain refinement was carried out by dynamic and metadynamic recrystallization. At low cooling rates, the effect of plastic deformation on the kinetics of phase transformations was indistinct. MDPI 2020-11-13 /pmc/articles/PMC7696398/ /pubmed/33202789 http://dx.doi.org/10.3390/ma13225116 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
Schindler, Ivo
Kawulok, Rostislav
Opěla, Petr
Kawulok, Petr
Rusz, Stanislav
Sojka, Jaroslav
Sauer, Michal
Navrátil, Horymír
Pindor, Lukáš
Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title_full Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title_fullStr Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title_full_unstemmed Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title_short Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel
title_sort effects of austenitization temperature and pre-deformation on cct diagrams of 23mnnicrmo5-3 steel
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7696398/
https://www.ncbi.nlm.nih.gov/pubmed/33202789
http://dx.doi.org/10.3390/ma13225116
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