Abstract
An investigation of the effects of hydrogen on tensile flow, strain-hardening and fracture characteristics of low nickel-type 316L austenitic stainless steel was quantified by means of slow strain rate tensile (SSRT) tests. Both thermal precharged and gaseous hydrogen conditions will be considered. The strain-hardening parameters were derived for an idealized true-stress/true-strain curve expressed by Hollomon’s equation. It was found that hydrogen affects the strain-hardening rate and reduces the overall strain-hardening exponents with a similar tendency for diminution of reduction area and fracture strain. The severity of hydrogen embrittlement was observed to be greater in a gaseous hydrogen environment than when tested in the hydrogen pre-charged specimen. Moreover, the fracture mechanism caused by hydrogen pre-charged and gaseous hydrogen environments were different. Hydrogen-induced cracks in hydrogen were found to appear at the interior of the grain boundary, in which there was a strain-induced martensite transformation phase, and crack formation at the grain boundary was predominant gaseous hydrogen specimens.
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Acknowledgments
This research was supported by Development of Reliability Measurement & Standard Technology for Hydrogen Fueling Station funded by Korea Research Institute of Standards and Science (KRISS-2019-GP2019-0012). This research was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and Ministry of Trade, Industry & Energy of the Republic of Korea [No. 201622 20100180, a study on risk assessment of hydrogen multi energy filling station].
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Thanh Tuan Nguyen received his Ph.D. in Mechanical Engineering from Chung-Ang University, Korea in 2018. He is currently working as a post-doctoral fellow at the Korea Research Institute of Standard and Science. His research interests are failure analysis, high-temperature fracture mechanics and the effect of gaseous hydrogen environments on the mechanical properties of materials.
Jaeyeong Park received his Ph.D. in Material Science Engineering from Pohang University of Science and Technology, Korea in 2018. He is currently working as Senior Researcher at the Korea Research Institute of Standard and Science. His research interests are materials science and the mechanical behaviour of materials at high temperature, including anisotropic materials such as gas turbine blades.
Seung Hoon Nahm received his Ph.D. in Mechanical Engineering from Kyung-pook National University, Korea in 1997. He is currently working as Principal Research Scientist at the Korea Research Institute of Standard and Science. His research interests are the mechanical behaviour of materials at the micro and nano scales, hydrogen embrittlement and mechanical behaviour of materials at high temperature.
Un Bong Baek received his Ph.D. in Mechanical Engineering from Kyung-pook National University in 2001. He worked at Georgia Institute of Technology, U.S.A. as a post-doctoral fellow during 2002-2003. Dr. Baek is currently Director of the Centre for Energy and Material Metrology of KRISS (Korea Research Institute of Standards and Science). His research interest is in the mechanical behaviour of materials in high-pressure hydrogen environments.
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Nguyen, T.T., Park, J., Nahm, S.H. et al. Effect of hydrogen on tensile flow and failure mechanism of low nickel-type 316L austenitic stainless steel. J Mech Sci Technol 33, 5843–5849 (2019). https://doi.org/10.1007/s12206-019-1131-2
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DOI: https://doi.org/10.1007/s12206-019-1131-2