Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness

A novel process is proposed to introduce ultrafine ferrite in a medium-carbon high-silicon steel that possesses low-temperature bainite. This process is based on the intercritical annealing of the cold-rolled tempered troostite and subsequent austempering at a temperature of 10 °C above martensite s...

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Autores principales:	Ting Zhao, Xin Jia, Chen Chen, Fucheng Zhang, Tiansheng Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Medium-carbon steel Low-temperature bainite Ultrafine ferrite Mechanical property Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/1b4756c59cf4455d82fe1e53883bafdf
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spelling	oai:doaj.org-article:1b4756c59cf4455d82fe1e53883bafdf2021-11-12T04:35:52ZIntroducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness2238-785410.1016/j.jmrt.2021.10.123https://doaj.org/article/1b4756c59cf4455d82fe1e53883bafdf2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S223878542101259Xhttps://doaj.org/toc/2238-7854A novel process is proposed to introduce ultrafine ferrite in a medium-carbon high-silicon steel that possesses low-temperature bainite. This process is based on the intercritical annealing of the cold-rolled tempered troostite and subsequent austempering at a temperature of 10 °C above martensite start temperature. The acquired microstructures, as well as the mechanical properties, were thoroughly studied and compared with the sample without ultrafine ferrite. Results show that, ultrafine ferrite with a grain size in the range of 0.5–2.0 μm is prepared in the low-temperature bainitic steel. The obtained ultrafine ferrite can be mainly attributed to the recrystallization of cold-rolled tempered troostite during intercritical annealing. Moreover, the introduction of ∼4 vol% ultrafine ferrite into the matrix with low-temperature bainite can simultaneously enhance the tensile strength, yield strength, and impact energy to 1614 MPa, 1074 MPa, and 52 J (half-width Charpy U-notch specimen), respectively, without loss of ductility. The high strength is mainly due to the fine bainitic ferrite laths, while the remarkable ductility and toughness are associated with the moderate contents of ultrafine ferrite and retained austenite within the microstructure.Ting ZhaoXin JiaChen ChenFucheng ZhangTiansheng WangElsevierarticleMedium-carbon steelLow-temperature bainiteUltrafine ferriteMechanical propertyMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5106-5113 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medium-carbon steel Low-temperature bainite Ultrafine ferrite Mechanical property Mining engineering. Metallurgy TN1-997
spellingShingle	Medium-carbon steel Low-temperature bainite Ultrafine ferrite Mechanical property Mining engineering. Metallurgy TN1-997 Ting Zhao Xin Jia Chen Chen Fucheng Zhang Tiansheng Wang Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
description	A novel process is proposed to introduce ultrafine ferrite in a medium-carbon high-silicon steel that possesses low-temperature bainite. This process is based on the intercritical annealing of the cold-rolled tempered troostite and subsequent austempering at a temperature of 10 °C above martensite start temperature. The acquired microstructures, as well as the mechanical properties, were thoroughly studied and compared with the sample without ultrafine ferrite. Results show that, ultrafine ferrite with a grain size in the range of 0.5–2.0 μm is prepared in the low-temperature bainitic steel. The obtained ultrafine ferrite can be mainly attributed to the recrystallization of cold-rolled tempered troostite during intercritical annealing. Moreover, the introduction of ∼4 vol% ultrafine ferrite into the matrix with low-temperature bainite can simultaneously enhance the tensile strength, yield strength, and impact energy to 1614 MPa, 1074 MPa, and 52 J (half-width Charpy U-notch specimen), respectively, without loss of ductility. The high strength is mainly due to the fine bainitic ferrite laths, while the remarkable ductility and toughness are associated with the moderate contents of ultrafine ferrite and retained austenite within the microstructure.
format	article
author	Ting Zhao Xin Jia Chen Chen Fucheng Zhang Tiansheng Wang
author_facet	Ting Zhao Xin Jia Chen Chen Fucheng Zhang Tiansheng Wang
author_sort	Ting Zhao
title	Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
title_short	Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
title_full	Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
title_fullStr	Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
title_full_unstemmed	Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
title_sort	introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/1b4756c59cf4455d82fe1e53883bafdf
work_keys_str_mv	AT tingzhao introducingultrafineferriteinlowtemperaturebainiticsteelthroughanovelprocessforsimultaneouslyimprovingstrengthandtoughness AT xinjia introducingultrafineferriteinlowtemperaturebainiticsteelthroughanovelprocessforsimultaneouslyimprovingstrengthandtoughness AT chenchen introducingultrafineferriteinlowtemperaturebainiticsteelthroughanovelprocessforsimultaneouslyimprovingstrengthandtoughness AT fuchengzhang introducingultrafineferriteinlowtemperaturebainiticsteelthroughanovelprocessforsimultaneouslyimprovingstrengthandtoughness AT tianshengwang introducingultrafineferriteinlowtemperaturebainiticsteelthroughanovelprocessforsimultaneouslyimprovingstrengthandtoughness
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Introducing ultrafine ferrite in low-temperature bainitic steel through a novel process for simultaneously improving strength and toughness

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