TY - JOUR
T1 - Slow strain rate tensile and fatigue properties of Cr-Mo and carbon steels in a 115 MPa hydrogen gas atmosphere
AU - Matsunaga, Hisao
AU - Yoshikawa, Michio
AU - Kondo, Ryota
AU - Yamabe, Junichiro
AU - Matsuoka, Saburo
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), Fundamental Research Project on Advanced Hydrogen Science (2006 – 2012) and Hydrogen Utilization Technology (2013 – 2018).
Publisher Copyright:
Copyright © 2015, Hydrogen Energy Publications, LLC.
PY - 2015/5/4
Y1 - 2015/5/4
N2 - Abstract Slow strain rate tensile (SSRT) tests were performed using smooth specimens of two types of steels, the Cr-Mo steel, JIS-SCM435, which has a tempered, martensitic microstructure, and the carbon steel, JIS-SM490B, which has a ferrite/pearlite microstructure. The tests were carried out in nitrogen gas and hydrogen gas, under a pressure of 115 MPa at three different temperatures: 233 K, room temperature and 393 K. In nitrogen gas, these steels exhibited the so-called cup-and-cone fracture at every temperature. In contrast, surface cracking led to a marked reduction in ductility in both steels in hydrogen gas. Nonetheless, even in hydrogen gas, JIS-SCM435 exhibited some reduction of area after the stress-displacement curve reached the tensile strength (TS), whereas JIS-SM490B demonstrated little, if any, necking in hydrogen gas. In addition, tension-compression fatigue testing at room temperature revealed that these steels show no noticeable degradation in fatigue strengths in hydrogen gas, especially in the relatively long-life regime. Considering that there was little or no hydrogen-induced degradation in either the TS or the fatigue strength in JIS-SCM435, it is suggested that the JIS-SCM435 is eligible for safety factor-based fatigue limit design for hydrogen service under pressures up to 115 MPa.
AB - Abstract Slow strain rate tensile (SSRT) tests were performed using smooth specimens of two types of steels, the Cr-Mo steel, JIS-SCM435, which has a tempered, martensitic microstructure, and the carbon steel, JIS-SM490B, which has a ferrite/pearlite microstructure. The tests were carried out in nitrogen gas and hydrogen gas, under a pressure of 115 MPa at three different temperatures: 233 K, room temperature and 393 K. In nitrogen gas, these steels exhibited the so-called cup-and-cone fracture at every temperature. In contrast, surface cracking led to a marked reduction in ductility in both steels in hydrogen gas. Nonetheless, even in hydrogen gas, JIS-SCM435 exhibited some reduction of area after the stress-displacement curve reached the tensile strength (TS), whereas JIS-SM490B demonstrated little, if any, necking in hydrogen gas. In addition, tension-compression fatigue testing at room temperature revealed that these steels show no noticeable degradation in fatigue strengths in hydrogen gas, especially in the relatively long-life regime. Considering that there was little or no hydrogen-induced degradation in either the TS or the fatigue strength in JIS-SCM435, it is suggested that the JIS-SCM435 is eligible for safety factor-based fatigue limit design for hydrogen service under pressures up to 115 MPa.
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U2 - 10.1016/j.ijhydene.2015.02.098
DO - 10.1016/j.ijhydene.2015.02.098
M3 - Article
AN - SCOPUS:84926409906
SN - 0360-3199
VL - 40
SP - 5739
EP - 5748
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 16
M1 - 15513
ER -
