Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering

The mechanical and thermal stability of austenite in multiphase advanced high strength steels are influenced by the surrounding microstructure. The mechanisms underlying and the relations between thermal and mechanical stability are still dubious due to the difficulty of isolating other factors infl...

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Autor: Hidalgo García, Javier
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/39456
Acceso en línea:http://www.scopus.com/inward/record.url?eid=2-s2.0-85014643379&partnerID=MN8TOARS
https://hdl.handle.net/10578/39456
Access Level:acceso abierto
Palabra clave:Martensite tempering
Quenching and partitioning steels
Retained austenite
Thermomechanical stability
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spelling Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of temperingHidalgo García, JavierMartensite temperingQuenching and partitioning steelsRetained austeniteThermomechanical stabilityThe mechanical and thermal stability of austenite in multiphase advanced high strength steels are influenced by the surrounding microstructure. The mechanisms underlying and the relations between thermal and mechanical stability are still dubious due to the difficulty of isolating other factors influencing austenite stability. In this work, martensite/austenite microstructures were created with the only significant difference being the degree of tempering of the martensite matrix. Hence, the effect of tempering in martensite is isolated from other factors influencing the stability of austenite. The thermal stability during heating of retained austenite was evaluated by monitoring phase fractions as a function of controlled temperature employing both dilatometry and magnetometry measurements. The mechanical stability was studied by performing interrupted tensile tests and determining the remaining austenite fraction at different levels of strain. The thermal stability of this remaining austenite after interrupted tests was studied by subsequent reheating of strained specimens. The results are evidence for the first time that thermal recovery of martensite during reheating assists austenite decomposition through shrinkage and softening of martensite caused by a reduction of dislocation density and carbon content in solid solution. This softening of martensite also leads to a subsequent reduction of austenite mechanical stability. Additionally, remaining austenite after pre-straining at room temperature was thermally less stable than before pre-straining, demonstrating that plastic deformation has opposing effects on thermal and mechanical stability.Elsevier202420242017info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://www.scopus.com/inward/record.url?eid=2-s2.0-85014643379&partnerID=MN8TOARShttps://hdl.handle.net/10578/39456reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/394562026-05-27T07:36:41Z
dc.title.none.fl_str_mv Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
title Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
spellingShingle Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
Hidalgo García, Javier
Martensite tempering
Quenching and partitioning steels
Retained austenite
Thermomechanical stability
title_short Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
title_full Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
title_fullStr Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
title_full_unstemmed Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
title_sort Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
dc.creator.none.fl_str_mv Hidalgo García, Javier
author Hidalgo García, Javier
author_facet Hidalgo García, Javier
author_role author
dc.subject.none.fl_str_mv Martensite tempering
Quenching and partitioning steels
Retained austenite
Thermomechanical stability
topic Martensite tempering
Quenching and partitioning steels
Retained austenite
Thermomechanical stability
description The mechanical and thermal stability of austenite in multiphase advanced high strength steels are influenced by the surrounding microstructure. The mechanisms underlying and the relations between thermal and mechanical stability are still dubious due to the difficulty of isolating other factors influencing austenite stability. In this work, martensite/austenite microstructures were created with the only significant difference being the degree of tempering of the martensite matrix. Hence, the effect of tempering in martensite is isolated from other factors influencing the stability of austenite. The thermal stability during heating of retained austenite was evaluated by monitoring phase fractions as a function of controlled temperature employing both dilatometry and magnetometry measurements. The mechanical stability was studied by performing interrupted tensile tests and determining the remaining austenite fraction at different levels of strain. The thermal stability of this remaining austenite after interrupted tests was studied by subsequent reheating of strained specimens. The results are evidence for the first time that thermal recovery of martensite during reheating assists austenite decomposition through shrinkage and softening of martensite caused by a reduction of dislocation density and carbon content in solid solution. This softening of martensite also leads to a subsequent reduction of austenite mechanical stability. Additionally, remaining austenite after pre-straining at room temperature was thermally less stable than before pre-straining, demonstrating that plastic deformation has opposing effects on thermal and mechanical stability.
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://www.scopus.com/inward/record.url?eid=2-s2.0-85014643379&partnerID=MN8TOARS
https://hdl.handle.net/10578/39456
url http://www.scopus.com/inward/record.url?eid=2-s2.0-85014643379&partnerID=MN8TOARS
https://hdl.handle.net/10578/39456
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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