Stress Corrosion Crack Propagation Behavior in SUS 304 Duplex Weld Metal

概要

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Stress corrosion crack (SCC) propagation behavior was studied in 42% MgCl_2 aq. solution (143゜C) on SUS 304 stainless steel weld metals which exhibited δ-ferrite-austenite duplex phases and an austenite single phase structure. Content ofδ-ferrite was varied by heat treatment and adding pure Ni powder into groove. Results are as follows. Stress corrosion crack in weld metal tends to propagate parallel or vertical to columnar crystal growth direction. It was made clear that SCC propagation rate in such inclined crack could be determined by apt calculation for K value. In both weld metals with an austenite single phase andδ-ferrite-austenite duplex phases (80%δ-ferrite content), a remarkable preferential crystal orientation was recognized and columnar crystal growth direction was almost <100> by facet pit method. On the other hand, microscopic SCC fracture plane was constituted mainly by < I O0>. Accordingly, it is considered that the selectivity of SCC growth directions in weld metals is caused by coherent preferential crystal orientations.
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1984-04-01