鋭敏化 304 鋼の粒界応力腐食割れの発生と進展に及ぼす NaF 濃度の影響

概要

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Using a slow strain rate technique, SSRT, with CCD camera system, initiation and growth behavior of intergranular stress corrosion cracking, IGSCC, for sensitized 304 stainless steel in aqueous solution containing various concentrations of NaF has been investigated. The largest decrease in maximum stress indicating the highest IGSCC susceptibility was found at 10^3 ppm NaF. And at the same concentration of 10^3 ppm NaF, the highest density of crack number and the shortest crack generation time was found. On the other hand, threshold stress intensity factor for IGSCC was independent of concentration of NaF. Crack growth rate showed a little dependence on NaF concentration, exhibiting a decrease at 10^3 ppm. It was obvious from the results that the highest IGSCC susceptibility at 10^3 ppm NaF was caused by increasing the number of cracks and decreasing the crack generation time, not by a change in threshold stress intensity factor for SCC or crack growth rate.
社団法人日本鉄鋼協会の論文
1993-06-01