Microscopical critical condition for the initiation of disbonding of weld overlaid pressure vessel steel.
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概要
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A series of experiments were conducted along with the calculation of hydrogen distribution within the specimen, in order to define the microscopical critical condition for initiation of disbonding in the austenitic stainless weld overlaid 21/4Cr-1 Mo steel. The experiments consist of observation of acoustic emission, analysis of hydrogen concentration in the interface zone, electrolytical charging o f hydrogen while major experiments were run by gas charging in autoclaves, and utilization of large-sized test blocks.Resultant major conclusions were that (1) disbonding is caused only by the effect of accumulated hydrogen on the cladding near the interface between cladding and the base metal under coexistence o f residual thermal stress, i.e., holding a specimen in high temperature hydrogen is not a necessary condition for disbonding, and (2) the microscopical critical condition for initiation of disbonding for a standard type of weld overlaid specimen is the calculated hydrogen concentration in cladding about 50μm apart from the interface to reach about 170ppm.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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