Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments

EUROFER97 steel plates for nuclear fusion applications are usually manufactured by hot rolling and subsequent heat treatments: (1) austenitization at 980 °C for 30 min, (2) rapid cooling and (3) tempering at 760 °C for 90 min. An extended experimental campaign was carried out with the scope of impro...

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Autores principales:	Giulia Stornelli, Andrea Di Schino, Silvia Mancini, Roberto Montanari, Claudio Testani, Alessandra Varone
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	EUROFER97 RAFM steels thermo-mechanical treatments microstructure dislocation density recrystallization Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e8f3e8d6b5944b35b3584fda58e0e5c2
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spelling	oai:doaj.org-article:e8f3e8d6b5944b35b3584fda58e0e5c22021-11-25T16:32:38ZGrain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments10.3390/app1122105982076-3417https://doaj.org/article/e8f3e8d6b5944b35b3584fda58e0e5c22021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10598https://doaj.org/toc/2076-3417EUROFER97 steel plates for nuclear fusion applications are usually manufactured by hot rolling and subsequent heat treatments: (1) austenitization at 980 °C for 30 min, (2) rapid cooling and (3) tempering at 760 °C for 90 min. An extended experimental campaign was carried out with the scope of improving the strength of the steel without a loss of ductility. Forty groups of samples were prepared by combining cold rolling with five cold reduction ratios (20, 40, 50, 60 and 80%) and heat treatments at eight different temperatures in the range 400–750 °C (steps of 50 °C). This work reports preliminary results regarding the microstructure and mechanical properties of all the cold-rolled samples and the effects of heat treatments on the samples deformed with the greater CR ratio (80%). The strength of deformed samples decreased as heat treatment temperature increased and the change was more pronounced in the samples cold-rolled with greater CR ratios. After heat treatments at temperature up to 600 °C yield stress (YS) and ultimate tensile strength (UTS) of samples deformed with CR ratio of 80% were significantly larger than those of standard EUROFER97 but ductility was lower. On the contrary, the treatment at 650 °C produced a fully recrystallized structure with sub-micrometric grains which guarantees higher strength and comparable ductility. The work demonstrated that EUROFER97 steel can be strengthened without compromising its ductility; the most effective process parameters will be identified by completing the analyses on all the prepared samples.Giulia StornelliAndrea Di SchinoSilvia ManciniRoberto MontanariClaudio TestaniAlessandra VaroneMDPI AGarticleEUROFER97RAFM steelsthermo-mechanical treatmentsmicrostructuredislocation densityrecrystallizationTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10598, p 10598 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	EUROFER97 RAFM steels thermo-mechanical treatments microstructure dislocation density recrystallization Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	EUROFER97 RAFM steels thermo-mechanical treatments microstructure dislocation density recrystallization Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Giulia Stornelli Andrea Di Schino Silvia Mancini Roberto Montanari Claudio Testani Alessandra Varone Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
description	EUROFER97 steel plates for nuclear fusion applications are usually manufactured by hot rolling and subsequent heat treatments: (1) austenitization at 980 °C for 30 min, (2) rapid cooling and (3) tempering at 760 °C for 90 min. An extended experimental campaign was carried out with the scope of improving the strength of the steel without a loss of ductility. Forty groups of samples were prepared by combining cold rolling with five cold reduction ratios (20, 40, 50, 60 and 80%) and heat treatments at eight different temperatures in the range 400–750 °C (steps of 50 °C). This work reports preliminary results regarding the microstructure and mechanical properties of all the cold-rolled samples and the effects of heat treatments on the samples deformed with the greater CR ratio (80%). The strength of deformed samples decreased as heat treatment temperature increased and the change was more pronounced in the samples cold-rolled with greater CR ratios. After heat treatments at temperature up to 600 °C yield stress (YS) and ultimate tensile strength (UTS) of samples deformed with CR ratio of 80% were significantly larger than those of standard EUROFER97 but ductility was lower. On the contrary, the treatment at 650 °C produced a fully recrystallized structure with sub-micrometric grains which guarantees higher strength and comparable ductility. The work demonstrated that EUROFER97 steel can be strengthened without compromising its ductility; the most effective process parameters will be identified by completing the analyses on all the prepared samples.
format	article
author	Giulia Stornelli Andrea Di Schino Silvia Mancini Roberto Montanari Claudio Testani Alessandra Varone
author_facet	Giulia Stornelli Andrea Di Schino Silvia Mancini Roberto Montanari Claudio Testani Alessandra Varone
author_sort	Giulia Stornelli
title	Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
title_short	Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
title_full	Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
title_fullStr	Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
title_full_unstemmed	Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments
title_sort	grain refinement and improved mechanical properties of eurofer97 by thermo-mechanical treatments
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e8f3e8d6b5944b35b3584fda58e0e5c2
work_keys_str_mv	AT giuliastornelli grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments AT andreadischino grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments AT silviamancini grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments AT robertomontanari grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments AT claudiotestani grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments AT alessandravarone grainrefinementandimprovedmechanicalpropertiesofeurofer97bythermomechanicaltreatments
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Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments

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