515 鋼の水素侵食による音速変化

概要

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Of the material degradation occurred in aged refineries and petrochemical equipments, one is hydrogen attack. For the investigation of initial stage of hydrogen attack for low carbon steel, the monitoring system was designed. By use of this system the in-situ measurement of temperature, and hydrogen pressure dependence of sound wave propagation time and the activity of acoustic emission were performed under the condition of high temperature of 773∿823K and high pressure of 14.7∿29.4MPa of hydrogen. It has been clarified that the changes in propagation time appeared after an incubation time depending on test conditions and acoustic emission also began to appear around the end of incubation periods. These results were discussed in relation to the computer simulation for the methane bubble growth using a coupled theory of dislocation creep and grain boundary diffusion.
一般社団法人日本機械学会の論文
2002-10-10