Numerical study on hydrogen thermal desorption spectra of high-carbon - dual phase steel

Ebihara, Kenichi   ; Sekine, Daiki*; Sakiyama, Yuji*; Takahashi, Jun*; Takai, Kenichi*; Omura, Tomohiko*

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.