TY - JOUR
T1 - Fatigue Properties of Ultra-Fine Grain Austenitic Stainless Steel and the Effect of Hydrogen
AU - Kubota, Masanobu
AU - MacAdre, Arnaud
AU - Mori, Koichi
AU - Mori, Ryo
N1 - Funding Information:
The ultra-fine grain austenitic stainless steel used in this study was provided by Professor Setuo Takaki at the Research Center for Steel, Kyushu University. All members in the Professor Takaki's laboratory provided us excellent support for this research. This study was also supported by the World Premier International Research Center Initiative (WPI), MEXT, Japan. The International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) is supported by the World Premier International Research Center Initiative (WPI), MEXT, Japan.
Publisher Copyright:
© The Authors, published by EDP Sciences, 2018.
PY - 2018/5/25
Y1 - 2018/5/25
N2 - The fatigue properties of ultra-fine grain austenitic steel (UFG16-10), which has a 1 μm average grain size, were studied as part of the project aimed at the development of high-strength low-cost stainless steels for hydrogen service. The fatigue properties of the UFG16-10 were compared with that of a coarse grain material with the same chemical composition (CG16-10) and two kinds of commercial steels, JIS SUS316 and JIS SUH660. The fatigue strength of the UFG16-10 was 2.8 times higher than that of the CG16-10. The effect of hydrogen on the fatigue limit of the UFG16-10 was not significant. However, the fatigue life of the UFG16-10 was reduced by hydrogen in the short life regime. In the fatigue crack growth test, the UFG16-10 showed a good crack growth resistance that was equivalent to that of the SUH660 and significantly higher than that of the SUS316. However, the crack growth rate was significantly accelerated by hydrogen. The cause of the hydrogen-assisted fatigue crack growth of the UFG16-10 was transformation of the microstructure at the crack tip from austenite to strain-induced martensite. This was also the cause of the reduced fatigue life of the hydrogen-charged UFG16-10.
AB - The fatigue properties of ultra-fine grain austenitic steel (UFG16-10), which has a 1 μm average grain size, were studied as part of the project aimed at the development of high-strength low-cost stainless steels for hydrogen service. The fatigue properties of the UFG16-10 were compared with that of a coarse grain material with the same chemical composition (CG16-10) and two kinds of commercial steels, JIS SUS316 and JIS SUH660. The fatigue strength of the UFG16-10 was 2.8 times higher than that of the CG16-10. The effect of hydrogen on the fatigue limit of the UFG16-10 was not significant. However, the fatigue life of the UFG16-10 was reduced by hydrogen in the short life regime. In the fatigue crack growth test, the UFG16-10 showed a good crack growth resistance that was equivalent to that of the SUH660 and significantly higher than that of the SUS316. However, the crack growth rate was significantly accelerated by hydrogen. The cause of the hydrogen-assisted fatigue crack growth of the UFG16-10 was transformation of the microstructure at the crack tip from austenite to strain-induced martensite. This was also the cause of the reduced fatigue life of the hydrogen-charged UFG16-10.
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U2 - 10.1051/matecconf/201816503007
DO - 10.1051/matecconf/201816503007
M3 - Conference article
AN - SCOPUS:85048085145
SN - 2261-236X
VL - 165
JO - MATEC Web of Conferences
JF - MATEC Web of Conferences
M1 - 03007
T2 - 12th International Fatigue Congress, FATIGUE 2018
Y2 - 27 May 2018 through 1 June 2018
ER -