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Materials (Basel). 2019 Aug 12;12(16). pii: E2575. doi: 10.3390/ma12162575.

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

Qu J1,2, Feng M3, An T1,3, Bi Z1, Du J1, Yang F3, Zheng S4.

Author information

1
High Temperature Materials Research Institute, Central Iron & Steel Research Institute, Beijing100081, China.
2
Beijing GAONA Materials & Technology Co., LTD, Beijing 100081, China.
3
State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China.
4
State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China. zhengsq@cup.edu.cn.

Abstract

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/cm2, leading to a fracture in the elastic deformation stage.

KEYWORDS:

crack propagation path; electron backscatter diffraction; heat-affected zone; hydrogen embrittlement

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