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Mitsuhara, Masatoshi*; Ikeda, Kenichi*; Hata, Satoshi*; Nakashima, Hideharu*; Wakai, Takashi
no journal, ,
no abstracts in English
Obara, Satoshi; Yamada, Yoshiyuki*; Nakazawa, Takanori*
no journal, ,
This presentation shows the effect of heat treatment on high tensile property and toughness in W added high Cr ferritic heat resistant steel with several heat treatments. In the tensile test at evaluated temperature, the tensile strength was increased with increasing normalizing temperature. On the contrary, the tensile strength was decreased with increasing tempering temperature and time. In the Charpy impact test, fracture appearance transition temperature (FATT) was increased and upper shelf energy (USE) was decreased with increasing normalizing temperature. On the contrary, the FATT was decreased and USE was increased with increasing tempering temperature and time.
Ebihara, Kenichi; Yamaguchi, Masatake; Suzudo, Tomoaki; Kaburaki, Hideo; Takai, Kenichi*
no journal, ,
The kind and the amount of defects in steel, that trap hydrogen, can be estimated from peaks in the hydrogen desorption profile obtained from thermal desorption analysis. We developed a numerical model which can simulate the desorption profiles for pure iron and eutectoid steel. Studying the mechanism of intergranular cracking by hydrogen embrittlement, in this presentation, we talk of the simulation of separating the peak for grain boundary from that for dislocation using the numerical model incorporating the binding energy of grain boundary which is obtained from the first-principles calculation.