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Ebihara, Kenichi; Sekine, Daiki*; Sakiyama, Yuji*; Takahashi, Jun*; Takai, Kenichi*; Omura, Tomohiko*
International Journal of Hydrogen Energy, 48(79), p.30949 - 30962, 2023/09
Times Cited Count：0 Percentile：0.01(Chemistry, Physical)To understand hydrogen embrittlement (HE), which is one of the stress corrosion cracking of steel materials, it is necessary to know the H distribution in steel, which can be effectively interpreted by numerical simulation of thermal desorption spectra. In weld metals and TRIP steels, residual austenite significantly influences the spectra, but a clear H distribution is not well known. In this study, an originally coded two-dimensional model was used to numerically simulate the previously reported spectra of high-carbon ferritic-austenitic duplex stainless steels, and it was found that H is mainly trapped at the carbide surface when the amount of H in the steel is low and at the duplex interface when the amount of H is high. It was also found that the thickness dependence of the H desorption peak for the interface trap site is caused by a different reason than the conventional one.
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dual phase steelEbihara, Kenichi; Sekine, Daiki*; Sakiyama, Yuji*; Takahashi, Jun*; Takai, Kenichi*; Omura, Tomohiko*
no journal, ,
Hydrogen embrittlement (HE) in high-strength steels and advanced high-strength steels is a phenomenon that must be understood for its prediction and prevention. Since the austenite phase ( phase) in these steels traps more H than the matrix phase, its effect on HE is of concern. In this study, we numerically reproduced the previously reported H thermal desorption spectra of a high-carbon - duplex stainless steel specimen to clarify the H-trapping defects in the specimen. The results show that H is trapped at the carbide surface when the amount of H inside the sample is low, but that the amount of H trapped at the phase surface increases as the H content increases, and that H trapped inside the phase is desorbed at relatively low temperatures. It was also found that the H entry simulation may not yield an appropriate pre-temperature initial H distribution. The conference will address this point.
