Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel

The microstructure evolution and microhardness of Q&P980 steel heat-affected zone (HAZ) was investigated systematically using weld thermal simulation technique. The phase transformation temperatures were determined by the dilatometry. Ac1 and Ac3 were observed to be quite constant, 750 and 935 °...

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Autores principales:	Xiaoyan Wu, Hongtao Lin, Wei Luo, Haitao Jiang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Thermal simulation technique Heat-affected zone Q&P980 steel Microstructure evolution Microhardness Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/7707f2fe40d148d6b3269b18a3682934
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spelling	oai:doaj.org-article:7707f2fe40d148d6b3269b18a36829342021-11-28T04:32:42ZMicrostructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel2238-785410.1016/j.jmrt.2021.11.059https://doaj.org/article/7707f2fe40d148d6b3269b18a36829342021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013399https://doaj.org/toc/2238-7854The microstructure evolution and microhardness of Q&P980 steel heat-affected zone (HAZ) was investigated systematically using weld thermal simulation technique. The phase transformation temperatures were determined by the dilatometry. Ac1 and Ac3 were observed to be quite constant, 750 and 935 °C, at the heating rates higher than 150 °C/s. The different regions of HAZ were obtained varying the peak heating temperature in the simulation experiments. With the peak temperature increased from 300 to 1350 °C, the microstructure evolved from martensite/ferrite/retained austenite to tempered martensite/carbides/ferrite, then finally turned to single martensite phase with fine lath or coarse lath morphology. The volume percentage of retained austenite reduced dramatically from 13% to 2% due to retained austenite transformation at high temperature. The lowest microhardness of 268 HV was obtained in sub-critical HAZ and the highest microhardness of 485 HV was obtained in fine grained HAZ. The welding continuous cooling transformation (CCT) diagram of Q&P980 steel corresponding coarse grained HAZ was constructed by dilatometric methods. There was ferrite, bainite and martensite transformation regions when the cooling rates ranged from 0.1 to 100 °C/s. The microhardness kept at a high certain level of 450–460 HV at high cooling rates (≥20 °C/s) because of the formation of martensite. By the CCT diagram determined, the effect of cooling rate on microstructure and microhardness can be deduced and utilized for optimizing the welding parameters.Xiaoyan WuHongtao LinWei LuoHaitao JiangElsevierarticleThermal simulation techniqueHeat-affected zoneQ&P980 steelMicrostructure evolutionMicrohardnessMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6067-6078 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermal simulation technique Heat-affected zone Q&P980 steel Microstructure evolution Microhardness Mining engineering. Metallurgy TN1-997
spellingShingle	Thermal simulation technique Heat-affected zone Q&P980 steel Microstructure evolution Microhardness Mining engineering. Metallurgy TN1-997 Xiaoyan Wu Hongtao Lin Wei Luo Haitao Jiang Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
description	The microstructure evolution and microhardness of Q&P980 steel heat-affected zone (HAZ) was investigated systematically using weld thermal simulation technique. The phase transformation temperatures were determined by the dilatometry. Ac1 and Ac3 were observed to be quite constant, 750 and 935 °C, at the heating rates higher than 150 °C/s. The different regions of HAZ were obtained varying the peak heating temperature in the simulation experiments. With the peak temperature increased from 300 to 1350 °C, the microstructure evolved from martensite/ferrite/retained austenite to tempered martensite/carbides/ferrite, then finally turned to single martensite phase with fine lath or coarse lath morphology. The volume percentage of retained austenite reduced dramatically from 13% to 2% due to retained austenite transformation at high temperature. The lowest microhardness of 268 HV was obtained in sub-critical HAZ and the highest microhardness of 485 HV was obtained in fine grained HAZ. The welding continuous cooling transformation (CCT) diagram of Q&P980 steel corresponding coarse grained HAZ was constructed by dilatometric methods. There was ferrite, bainite and martensite transformation regions when the cooling rates ranged from 0.1 to 100 °C/s. The microhardness kept at a high certain level of 450–460 HV at high cooling rates (≥20 °C/s) because of the formation of martensite. By the CCT diagram determined, the effect of cooling rate on microstructure and microhardness can be deduced and utilized for optimizing the welding parameters.
format	article
author	Xiaoyan Wu Hongtao Lin Wei Luo Haitao Jiang
author_facet	Xiaoyan Wu Hongtao Lin Wei Luo Haitao Jiang
author_sort	Xiaoyan Wu
title	Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
title_short	Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
title_full	Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
title_fullStr	Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
title_full_unstemmed	Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel
title_sort	microstructure and microhardness evolution of thermal simulated haz of q&p980 steel
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/7707f2fe40d148d6b3269b18a3682934
work_keys_str_mv	AT xiaoyanwu microstructureandmicrohardnessevolutionofthermalsimulatedhazofqp980steel AT hongtaolin microstructureandmicrohardnessevolutionofthermalsimulatedhazofqp980steel AT weiluo microstructureandmicrohardnessevolutionofthermalsimulatedhazofqp980steel AT haitaojiang microstructureandmicrohardnessevolutionofthermalsimulatedhazofqp980steel
_version_	1718408325350031360

Microstructure and microhardness evolution of thermal simulated HAZ of Q&P980 steel

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