Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging

Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging

Herein, the hydrogen embrittlement of a heat-affected zone (HAZ) was examined using slow strain rate tension in situ hydrogen charging. The influence of hydrogen on the crack path of the HAZ sample surfaces was determined using electron back scatter diffraction analysis. The hydrogen embrittlement s...

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Main Authors: Jinglong Qu, Min Feng, Teng An, Zhongnan Bi, Jinhui Du, Feng Yang, Shuqi Zheng
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Materials
Subjects:
heat-affected zone
hydrogen embrittlement
electron backscatter diffraction
crack propagation path
Online Access:https://www.mdpi.com/1996-1944/12/16/2575
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spelling doaj-bf0f7b4321b94554ac2c72ad0ddc5c1d2020-11-24T21:38:51ZengMDPI AGMaterials1996-19442019-08-011216257510.3390/ma12162575ma12162575Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen ChargingJinglong Qu0Min Feng1Teng An2Zhongnan Bi3Jinhui Du4Feng Yang5Shuqi Zheng6High Temperature Materials Research Institute, Central Iron &amp; Steel Research Institute, Beijing 100081, ChinaState Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, ChinaHigh Temperature Materials Research Institute, Central Iron &amp; Steel Research Institute, Beijing 100081, ChinaHigh Temperature Materials Research Institute, Central Iron &amp; Steel Research Institute, Beijing 100081, ChinaHigh Temperature Materials Research Institute, Central Iron &amp; Steel Research Institute, Beijing 100081, ChinaState Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, ChinaHerein, the hydrogen embrittlement of a heat-affected zone (HAZ) was examined using slow strain rate tension in situ hydrogen charging. The influence of hydrogen on the crack path of the HAZ sample surfaces was determined using electron back scatter diffraction analysis. The hydrogen embrittlement susceptibility of the base metal and the HAZ samples increased with increasing current density. The HAZ samples have lower resistance to hydrogen embrittlement than the base metal samples in the same current density. Brittle circumferential cracks located at the HAZ sample surfaces were perpendicular to the loading direction, and the crack propagation path indicated that five or more cracks may join together to form a longer crack. The fracture morphologies were found to be a mixture of intergranular and transgranular fractures. Hydrogen blisters were observed on the HAZ sample surfaces after conducting tensile tests at a current density of 40 mA/cm<sup>2</sup>, leading to a fracture in the elastic deformation stage.https://www.mdpi.com/1996-1944/12/16/2575heat-affected zonehydrogen embrittlementelectron backscatter diffractioncrack propagation path
collection DOAJ
language English
format Article
sources DOAJ
author Jinglong Qu
Min Feng
Teng An
Zhongnan Bi
Jinhui Du
Feng Yang
Shuqi Zheng
spellingShingle Jinglong Qu
Min Feng
Teng An
Zhongnan Bi
Jinhui Du
Feng Yang
Shuqi Zheng
Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
Materials
heat-affected zone
hydrogen embrittlement
electron backscatter diffraction
crack propagation path
author_facet Jinglong Qu
Min Feng
Teng An
Zhongnan Bi
Jinhui Du
Feng Yang
Shuqi Zheng
author_sort Jinglong Qu
title Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
title_short Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
title_full Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
title_fullStr Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
title_full_unstemmed Hydrogen-Assisted Crack Growth in the Heat-Affected Zone of X80 Steels during in Situ Hydrogen Charging
title_sort hydrogen-assisted crack growth in the heat-affected zone of x80 steels during in situ hydrogen charging
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-08-01
description Herein, the hydrogen embrittlement of a heat-affected zone (HAZ) was examined using slow strain rate tension in situ hydrogen charging. The influence of hydrogen on the crack path of the HAZ sample surfaces was determined using electron back scatter diffraction analysis. The hydrogen embrittlement susceptibility of the base metal and the HAZ samples increased with increasing current density. The HAZ samples have lower resistance to hydrogen embrittlement than the base metal samples in the same current density. Brittle circumferential cracks located at the HAZ sample surfaces were perpendicular to the loading direction, and the crack propagation path indicated that five or more cracks may join together to form a longer crack. The fracture morphologies were found to be a mixture of intergranular and transgranular fractures. Hydrogen blisters were observed on the HAZ sample surfaces after conducting tensile tests at a current density of 40 mA/cm<sup>2</sup>, leading to a fracture in the elastic deformation stage.
topic heat-affected zone
hydrogen embrittlement
electron backscatter diffraction
crack propagation path
url https://www.mdpi.com/1996-1944/12/16/2575
work_keys_str_mv AT jinglongqu hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT minfeng hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT tengan hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT zhongnanbi hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT jinhuidu hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT fengyang hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
AT shuqizheng hydrogenassistedcrackgrowthintheheataffectedzoneofx80steelsduringinsituhydrogencharging
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