Investigation of Hydrogen Embrittlement Susceptibility of X80 Weld Joints by Thermal Simulation

Journal Article · Tue May 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3330-X· OSTI ID:22860517

Peng, Huangtao; An, Teng; Zheng, Shuqi; Luo, Bingwei; Wang, Siyu; Zhang, Shuai ^[1]

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1. China University of Petroleum, State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering (China)

The objective of this study was to investigate the hydrogen embrittlement (HE) susceptibility and influence mechanism of X80 weld joints. Slow strain rate testing (SSRT) under in situ H-charging, combined with microstructure and fracture analysis, was performed on the base metal (BM), weld metal (WM), thermally simulated fine-grained heat-affected zone (FGHAZ) and coarse-grained heat-affected zone (CGHAZ). Results showed that the WM and simulated HAZ had a greater degree of high local strain distribution than the BM; compared to the CGHAZ, the FGHAZ had lower microhardness and more uniformly distributed stress. SSRT results showed that the weld joint was highly sensitive to HE; the HE index decreased in the following sequence: FGHAZ, WM, CGHAZ and BM. The effect of the microstructure on HE was mainly reflected in microstructure, local stress distribution and microhardness.

• OSTI ID: 22860517
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 5 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DISTRIBUTION
HEAT AFFECTED ZONE
METALS
MICROHARDNESS
MICROSTRUCTURE
SIMULATION
STRAIN RATE
STRAINS
STRESSES
TESTING
WELDED JOINTS