海洋環境下における高張力鋼応力腐食割れ挙動のSSRT法による評価

概要

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Slow strain rate tests (SSRT) have been carried out on high strength steel HT80 in air and the synthetic sea water at the free corrosion potential Ecorr, and cathodic protection potential, Specimens tested were subjected to fractographic examination to examine SCC crack on a fracture surface. The objectives of this study were to investigate the suitable cathodic protection condition and its dependence upon the flow condition of sea water. Furthermore, emphasis was placed on finding the most suitable evaluation parameters for SCC susceptibility from SSRT characteristics, considering the effect of size. From this study, fracture mechanisms seems to be changed with shifting potential to the cathodic direction, and maximum crack length was increased at more basic potentials. It was found that the most suitable parameters to evaluate SCC susceptibility are reduction in area Ra and the maximum crack length Δa.
一般社団法人日本機械学会の論文
1988-04-25