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Ebihara, Kenichi; Iwamoto, Takashi*; Miwa, Noriaki*; Yamada, Hiroki*; Okamura, Tsukasa*; Urushihara, Wataru*; Omura, Tomohiko*
"Suiso Zeika Kenkyu No Kiban Kochiku" Kenkyukai Hokokusho, p.21 - 26, 2013/10
In order to explore the properly hydrogen-charging method for the estimation of hydrogen embrittlement of steels, in the workshop of Fundamental construction for hydrogen embrittlement supported by the Iron and Steel Institute of Japan of which I took part for understanding the mechanism of hydrogen embrittlement which is one cause of stress corrosion cracking, the thermal desorption spectrum of hydrogen and the amount of charged hydrogen were estimated among various kinds of steels charged with hydrogen by various methods. The presentation is a part of a series of the final report about the results obtained in the workshop. In the presentation, I talk about the numerical estimation of the desorption spectrum of low alloy steel mainly on the basis of the paper which is going to be published in the ISIJ International. Particularly, the kind of defects in the steel that capture hydrogen forming the spectrum and the experimental method for identifying the defects are explained in details.
Ebihara, Kenichi
"Suiso Zeika Kenkyu No Kiban Kochiku" Kenkyukai Hokokusho, p.103 - 108, 2013/10
For understanding the mechanism of hydrogen embrittlement which is considered to be one cause of stress corrosion cracking, it is indispensable to identify the hydrogen segregation state (hydrogen existing state). The thermal desorption spectrum which is obtained in thermal desorption analysis by measuring hydrogen desorbing from specimens heated at a constant rate is used for identifying the hydrogen existing state. The numerical simulation of thermal desorption spectra is necessary for interpreting them because the other factors except the effect of defects capturing hydrogen are included in them. The presentation introduces the current numerical models for simulating desorption spectra and shows their calculation examples. The effect of parameters on spectra and the simulation method are described. Furthermore, the simulation result under the condition which has not been reported previously is shown and the future of TDA simulation is discussed.