Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70

In order to solve the embrittlement problem of coarse grain zone (CGHAZ) of deep-sea X70 pipeline steel in actual welding,the thermal simulation study of X70 pipeline steel was carried out under different thermal cycle processes.X70 pipeline steel CGHAZ was simulated by Gleeble-3800 thermal simulato...

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Autores principales:	Zhiwen LIU, Shujun JIA, Hao YANG, Xiaokai LIANG, Liang ZHANG, Yining FAN, Pengbiao HAN
Formato:	article
Lenguaje:	ZH
Publicado:	Hebei University of Science and Technology 2021
Materias:	welding process and equipment; x70 pipeline steel; cghaz; heat input; microstructure; toughness Technology T
Acceso en línea:	https://doaj.org/article/a192e36efeb44a31870c6da021369e99
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spelling	oai:doaj.org-article:a192e36efeb44a31870c6da021369e992021-11-23T07:09:07ZEffect of heat input on microstructure and toughness of CGHAZ of deep-sea X701008-154210.7535/hbkd.2021yx05010https://doaj.org/article/a192e36efeb44a31870c6da021369e992021-10-01T00:00:00Zhttp://xuebao.hebust.edu.cn/hbkjdx/ch/reader/create_pdf.aspx?file_no=b202105010&flag=1&journal_https://doaj.org/toc/1008-1542In order to solve the embrittlement problem of coarse grain zone (CGHAZ) of deep-sea X70 pipeline steel in actual welding,the thermal simulation study of X70 pipeline steel was carried out under different thermal cycle processes.X70 pipeline steel CGHAZ was simulated by Gleeble-3800 thermal simulator to study the microstructure and toughness of CGHAZ under different heat input (HI) conditions in the range of 10~60 kJ/cm.The microstructure and toughness of CGHAZ were characterized by means of optical microscope (OM),scanning electron microscope (SEM) and Charpy impact test.The results show that the microstructure of the test steel under different heat input is mainly composed of granular bainite (GB),bainite ferrite (BF) and martensite-austenite component(M-A component).When HI increases continuously,the proportion of BF decreases,the proportion of GB increases,the M-A component coarsens,and the impact absorption energy first increases and then decreases.In the case of 20 kJ/cm,the excellent combination of BF and GB is obtained,the fracture is ductile fracture,and the impact absorption energy reaches [BF]173.8[BFQ] J;when HI is greater than 20 kJ/cm,the fracture is dissociated and fractured,and the impact absorption energy decreases obviously,with the lowest of [BF]18.8[BFQ] J.Therefore,lower heat input can improve the toughness of CGHAZ,make X70 pipeline steel have high strength,high toughness and good weldability,and provide some theoretical guidance for the optimization of welding process.[HQ]Zhiwen LIUShujun JIAHao YANGXiaokai LIANGLiang ZHANGYining FANPengbiao HANHebei University of Science and Technologyarticlewelding process and equipment; x70 pipeline steel; cghaz; heat input; microstructure; toughnessTechnologyTZHJournal of Hebei University of Science and Technology, Vol 42, Iss 5, Pp 516-522 (2021)
institution	DOAJ
collection	DOAJ
language	ZH
topic	welding process and equipment; x70 pipeline steel; cghaz; heat input; microstructure; toughness Technology T
spellingShingle	welding process and equipment; x70 pipeline steel; cghaz; heat input; microstructure; toughness Technology T Zhiwen LIU Shujun JIA Hao YANG Xiaokai LIANG Liang ZHANG Yining FAN Pengbiao HAN Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
description	In order to solve the embrittlement problem of coarse grain zone (CGHAZ) of deep-sea X70 pipeline steel in actual welding,the thermal simulation study of X70 pipeline steel was carried out under different thermal cycle processes.X70 pipeline steel CGHAZ was simulated by Gleeble-3800 thermal simulator to study the microstructure and toughness of CGHAZ under different heat input (HI) conditions in the range of 10~60 kJ/cm.The microstructure and toughness of CGHAZ were characterized by means of optical microscope (OM),scanning electron microscope (SEM) and Charpy impact test.The results show that the microstructure of the test steel under different heat input is mainly composed of granular bainite (GB),bainite ferrite (BF) and martensite-austenite component(M-A component).When HI increases continuously,the proportion of BF decreases,the proportion of GB increases,the M-A component coarsens,and the impact absorption energy first increases and then decreases.In the case of 20 kJ/cm,the excellent combination of BF and GB is obtained,the fracture is ductile fracture,and the impact absorption energy reaches [BF]173.8[BFQ] J;when HI is greater than 20 kJ/cm,the fracture is dissociated and fractured,and the impact absorption energy decreases obviously,with the lowest of [BF]18.8[BFQ] J.Therefore,lower heat input can improve the toughness of CGHAZ,make X70 pipeline steel have high strength,high toughness and good weldability,and provide some theoretical guidance for the optimization of welding process.[HQ]
format	article
author	Zhiwen LIU Shujun JIA Hao YANG Xiaokai LIANG Liang ZHANG Yining FAN Pengbiao HAN
author_facet	Zhiwen LIU Shujun JIA Hao YANG Xiaokai LIANG Liang ZHANG Yining FAN Pengbiao HAN
author_sort	Zhiwen LIU
title	Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
title_short	Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
title_full	Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
title_fullStr	Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
title_full_unstemmed	Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70
title_sort	effect of heat input on microstructure and toughness of cghaz of deep-sea x70
publisher	Hebei University of Science and Technology
publishDate	2021
url	https://doaj.org/article/a192e36efeb44a31870c6da021369e99
work_keys_str_mv	AT zhiwenliu effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT shujunjia effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT haoyang effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT xiaokailiang effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT liangzhang effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT yiningfan effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70 AT pengbiaohan effectofheatinputonmicrostructureandtoughnessofcghazofdeepseax70
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Effect of heat input on microstructure and toughness of CGHAZ of deep-sea X70

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