TY - GEN
T1 - Visualization of trapped hydrogen along grain boundaries and its roles on hydrogen-induced intergranular fracture in slow strain rate tensile testing of pure nickel
AU - Wada, Kentaro
AU - Yamabe, Junichiro
AU - Matsunaga, Hisao
N1 - Funding Information:
A part of this study (EBSD analysis) was conducted with support from the Advanced Characterization Platform of the Nanotechnology Platform Japan, sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. The authors wish to thank Dr. Tohru Awane (Kobe Material Testing Laboratory) and Mr. Shiro Miwa (CAMECA, AMETEK) for providing technical supports on SIMS analysis. The authors are also grateful to Mr. Satoshi Yabu (KOBELCO Research Institute) for the helpful technical supports for AES analysis.
Publisher Copyright:
© 2020 ASME
PY - 2020
Y1 - 2020
N2 - It has been reported that hydrogen accumulation along grain boundaries (GBs) is an important process in the hydrogen embrittlement (HE) in pure Ni. However, there are no quantitative studies that elucidate the behavior of hydrogen accumulation and its effect on HE. Consequently, the segregating behavior of hydrogen along GBs and its role in intergranular (IG) fracture in pure Ni were examined in the present research, via a combination of thermal desorption analysis, secondary iron mass spectrometry, Auger electron spectroscopy and slow strain rate tensile testing. It was successfully demonstrated that the hydrogen trapped at GBs and the sulfur segregated along GBs contributed to the hydrogen-trapping. In addition, the contribution of trapped hydrogen on the hydrogen-induced ductility loss was quantitatively investigated. The results revealed a decreased reduction in area (RA) with a concomitant increase in trap-site occupancy, implying that the trapped hydrogen controlled the hydrogen-induced IG fracture and ductility loss in pure Ni.
AB - It has been reported that hydrogen accumulation along grain boundaries (GBs) is an important process in the hydrogen embrittlement (HE) in pure Ni. However, there are no quantitative studies that elucidate the behavior of hydrogen accumulation and its effect on HE. Consequently, the segregating behavior of hydrogen along GBs and its role in intergranular (IG) fracture in pure Ni were examined in the present research, via a combination of thermal desorption analysis, secondary iron mass spectrometry, Auger electron spectroscopy and slow strain rate tensile testing. It was successfully demonstrated that the hydrogen trapped at GBs and the sulfur segregated along GBs contributed to the hydrogen-trapping. In addition, the contribution of trapped hydrogen on the hydrogen-induced ductility loss was quantitatively investigated. The results revealed a decreased reduction in area (RA) with a concomitant increase in trap-site occupancy, implying that the trapped hydrogen controlled the hydrogen-induced IG fracture and ductility loss in pure Ni.
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U2 - 10.1115/PVP2020-21213
DO - 10.1115/PVP2020-21213
M3 - Conference contribution
AN - SCOPUS:85095968050
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - Materials and Fabrication
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2020 Pressure Vessels and Piping Conference, PVP 2020
Y2 - 3 August 2020
ER -