| RESEARCH PAPER |
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Hydrogen Embrittlement Susceptibility of 1 000 MPa Grade High
Strength Steel Weldment |
| GAO Xinxin1,2, GUO Jianzhang1, ZHANG Haibing2
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1 College of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Qingdao 266061;
2 Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship
Materials Research Institute, Qingdao 266101 |
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Abstract Hydrogen permeation behavior and stress corrosion sensitivity of 1 000 MPa grade high strength steel (HSS) weldment in sea water were studied by hydrogen permeation test and slow strain rate test (SSRT). The fracture characteristics were observed by SEM. Electrochemical test and microstructure observation were also applied to research the hydrogen embrittlement (HE) of the weldment. The results showed that heat affected zone (HAZ) compared with the weld material (WM) and the base metal(BM) had the most negative open circuit potential(OCP) and most positive hydrogen evolution potential, which meant hydrogen evolution and corrosion would be easier to take place in the HAZ. The HAZ of high strength steel weldment had a maximum hydrogen diffusion coefficient and strong tendency to absorb hydrogen. The effect of dynamic electrochemical hydrogen charging on the weldment of high strength steel mainly reflected in the reduction of its plasticity. The strength of the high strength steel weldment showed slight differences under various polarization potentials. While with polarization potential negative shifted, the shrinkage and the elongation decreased and the fracture mode gradually changed from ductile to cleavage. The hydrogen embrittlement coefficient of high strength steel weldment reached the threshold of 25% while the cathodic potential was about -930 mV (vs SCE). The fracture locations of the specimen were mostly in the HAZ under different cathodic potentials.
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Published: 25 March 2017
Online: 2018-05-02
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2017, Vol. 31 
