Cargando…

Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments

The work presents results of phase transformation kinetics of hot-rolled 5% Mn steel subjected to different heat treatments. Three different schedules were introduced: isothermal holding in a bainite region, coiling simulation and intercritical annealing. The evolution of microstructure components w...

Descripción completa

Detalles Bibliográficos
Autores principales: Morawiec, Mateusz, Grajcar, Adam, Zalecki, Władysław, Garcia-Mateo, Carlos, Opiela, Marek
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7079595/
https://www.ncbi.nlm.nih.gov/pubmed/32098018
http://dx.doi.org/10.3390/ma13040958
_version_ 1783507859734003712
author Morawiec, Mateusz
Grajcar, Adam
Zalecki, Władysław
Garcia-Mateo, Carlos
Opiela, Marek
author_facet Morawiec, Mateusz
Grajcar, Adam
Zalecki, Władysław
Garcia-Mateo, Carlos
Opiela, Marek
author_sort Morawiec, Mateusz
collection PubMed
description The work presents results of phase transformation kinetics of hot-rolled 5% Mn steel subjected to different heat treatments. Three different schedules were introduced: isothermal holding in a bainite region, coiling simulation and intercritical annealing. The evolution of microstructure components was investigated using dilatometric and metallographic analyses. According to obtained results, the medium-Mn steel exhibits high resistance for γ/α transformation during the bainite transformation and coiling simulation (upon cooling from the austenite region). During 5 h isothermal holding, no bainite and/or ferrite formation was detected. This results in the formation of martensite upon cooling to room temperature. Differently, when the steel was subjected to the intercritical annealing at 720 and 700 °C (upon heating from room temperature), a final microstructure consisted of ferrite, martensite and retained austenite. At 700 °C, no fresh martensite formation was detected upon cooling to room temperature. This means that the austenite was enriched in carbon during the intercritical annealing step enough to keep its thermal stability.
format Online
Article
Text
id pubmed-7079595
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-70795952020-03-24 Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments Morawiec, Mateusz Grajcar, Adam Zalecki, Władysław Garcia-Mateo, Carlos Opiela, Marek Materials (Basel) Article The work presents results of phase transformation kinetics of hot-rolled 5% Mn steel subjected to different heat treatments. Three different schedules were introduced: isothermal holding in a bainite region, coiling simulation and intercritical annealing. The evolution of microstructure components was investigated using dilatometric and metallographic analyses. According to obtained results, the medium-Mn steel exhibits high resistance for γ/α transformation during the bainite transformation and coiling simulation (upon cooling from the austenite region). During 5 h isothermal holding, no bainite and/or ferrite formation was detected. This results in the formation of martensite upon cooling to room temperature. Differently, when the steel was subjected to the intercritical annealing at 720 and 700 °C (upon heating from room temperature), a final microstructure consisted of ferrite, martensite and retained austenite. At 700 °C, no fresh martensite formation was detected upon cooling to room temperature. This means that the austenite was enriched in carbon during the intercritical annealing step enough to keep its thermal stability. MDPI 2020-02-21 /pmc/articles/PMC7079595/ /pubmed/32098018 http://dx.doi.org/10.3390/ma13040958 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
Morawiec, Mateusz
Grajcar, Adam
Zalecki, Władysław
Garcia-Mateo, Carlos
Opiela, Marek
Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title_full Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title_fullStr Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title_full_unstemmed Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title_short Dilatometric Study of Phase Transformations in 5 Mn Steel Subjected to Different Heat Treatments
title_sort dilatometric study of phase transformations in 5 mn steel subjected to different heat treatments
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7079595/
https://www.ncbi.nlm.nih.gov/pubmed/32098018
http://dx.doi.org/10.3390/ma13040958
work_keys_str_mv AT morawiecmateusz dilatometricstudyofphasetransformationsin5mnsteelsubjectedtodifferentheattreatments
AT grajcaradam dilatometricstudyofphasetransformationsin5mnsteelsubjectedtodifferentheattreatments
AT zaleckiwładysław dilatometricstudyofphasetransformationsin5mnsteelsubjectedtodifferentheattreatments
AT garciamateocarlos dilatometricstudyofphasetransformationsin5mnsteelsubjectedtodifferentheattreatments
AT opielamarek dilatometricstudyofphasetransformationsin5mnsteelsubjectedtodifferentheattreatments