Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels

The presence of acicular ferrite (AF) in the heat-affected zone (HAZ) of steels used offshore is generally seen as beneficial for toughness. In this study, the effects of varying fractions of AF (0–49 vol.%) were assessed in the simulated, unaltered and coarse-grained heat-affected zones (CGHAZ) of...

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Autores principales:	Henri Tervo, Antti Kaijalainen, Vahid Javaheri, Mohammed Ali, Tuomas Alatarvas, Mikko Mehtonen, Severi Anttila, Jukka Kömi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CGHAZ acicular ferrite Ti-deoxidized steel inclusions precipitates instrumented CVN Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/a42191fff658487795aa8fbfd5f14780
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spelling	oai:doaj.org-article:a42191fff658487795aa8fbfd5f147802021-11-25T18:21:54ZComparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels10.3390/met111117832075-4701https://doaj.org/article/a42191fff658487795aa8fbfd5f147802021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1783https://doaj.org/toc/2075-4701The presence of acicular ferrite (AF) in the heat-affected zone (HAZ) of steels used offshore is generally seen as beneficial for toughness. In this study, the effects of varying fractions of AF (0–49 vol.%) were assessed in the simulated, unaltered and coarse-grained heat-affected zones (CGHAZ) of three experimental steels. Two steels were deoxidized using Ti and one using Al. The characterization was carried out by using electron microscopy, energy-dispersive X-ray spectrometry, electron backscatter diffraction and X-ray diffraction. The fraction of AF varied with the heat input and cooling time applied in the Gleeble thermomechanical simulator. AF was present in one of the Ti-deoxidized steels with all the applied cooling times, and its fraction increased with increasing cooling time. However, in other materials, only a small fraction (13–22%) of AF was present and only when the longest cooling time was applied. The impact toughness of the simulated specimens was evaluated using instrumented Charpy V-notch testing. Contrary to the assumption, the highest impact toughness was obtained in the conventional Al-deoxidized steel with little or no AF in the microstructure, while the variants with the highest fraction of AF had the lowest impact toughness. It was concluded that the coarser microstructural and inclusion features of the steels with AF and also the fraction of AF may not have been great enough to improve the CGHAZ toughness of the steels investigated.Henri TervoAntti KaijalainenVahid JavaheriMohammed AliTuomas AlatarvasMikko MehtonenSeveri AnttilaJukka KömiMDPI AGarticleCGHAZacicular ferriteTi-deoxidized steelinclusionsprecipitatesinstrumented CVNMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1783, p 1783 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CGHAZ acicular ferrite Ti-deoxidized steel inclusions precipitates instrumented CVN Mining engineering. Metallurgy TN1-997
spellingShingle	CGHAZ acicular ferrite Ti-deoxidized steel inclusions precipitates instrumented CVN Mining engineering. Metallurgy TN1-997 Henri Tervo Antti Kaijalainen Vahid Javaheri Mohammed Ali Tuomas Alatarvas Mikko Mehtonen Severi Anttila Jukka Kömi Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
description	The presence of acicular ferrite (AF) in the heat-affected zone (HAZ) of steels used offshore is generally seen as beneficial for toughness. In this study, the effects of varying fractions of AF (0–49 vol.%) were assessed in the simulated, unaltered and coarse-grained heat-affected zones (CGHAZ) of three experimental steels. Two steels were deoxidized using Ti and one using Al. The characterization was carried out by using electron microscopy, energy-dispersive X-ray spectrometry, electron backscatter diffraction and X-ray diffraction. The fraction of AF varied with the heat input and cooling time applied in the Gleeble thermomechanical simulator. AF was present in one of the Ti-deoxidized steels with all the applied cooling times, and its fraction increased with increasing cooling time. However, in other materials, only a small fraction (13–22%) of AF was present and only when the longest cooling time was applied. The impact toughness of the simulated specimens was evaluated using instrumented Charpy V-notch testing. Contrary to the assumption, the highest impact toughness was obtained in the conventional Al-deoxidized steel with little or no AF in the microstructure, while the variants with the highest fraction of AF had the lowest impact toughness. It was concluded that the coarser microstructural and inclusion features of the steels with AF and also the fraction of AF may not have been great enough to improve the CGHAZ toughness of the steels investigated.
format	article
author	Henri Tervo Antti Kaijalainen Vahid Javaheri Mohammed Ali Tuomas Alatarvas Mikko Mehtonen Severi Anttila Jukka Kömi
author_facet	Henri Tervo Antti Kaijalainen Vahid Javaheri Mohammed Ali Tuomas Alatarvas Mikko Mehtonen Severi Anttila Jukka Kömi
author_sort	Henri Tervo
title	Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
title_short	Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
title_full	Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
title_fullStr	Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
title_full_unstemmed	Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels
title_sort	comparison of impact toughness in simulated coarse-grained heat-affected zone of al-deoxidized and ti-deoxidized offshore steels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a42191fff658487795aa8fbfd5f14780
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Comparison of Impact Toughness in Simulated Coarse-Grained Heat-Affected Zone of Al-Deoxidized and Ti-Deoxidized Offshore Steels

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