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概要

Stress corrosion cracking (SCC) behavior of low-carbon stainless steel welds in high temperature water has been discussed with special attention on relation to the characteristics of microstructure. To investigate the effect of .-ferrite on SCC behavior, simulated heat-affected zone (partially melted zone) microstructure, where .-ferrite islands were widely distributed on grain boundary, was made by induction heating up to just below melting point. From the results of constant strain SCC test in high temperature water, it has been obvious that many crack tips located at .-ferrite. The relative crack growth rate at the .-. interface was estimated to be much lower than that at the .-. interface. Cracks remained for a considerable period of time just after they reached .-ferrite islands which act as a crack arrester.

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