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概要

Stress corrosion cracking (SCC) has been observed near the welded zones of pipes made of austenitic stainless steel type 16L. Residual stress is an important factor for SCC. In the joining processes of pipes, butt welding is conducted after rface machining. Residual stress is generated by both processes. In this study, numerical analyses of the residual stres distribution by butt welding after surface machining were performed by the finite element method. The SCC initiation ti me was estimated by the residual stress at the inner surface. SCC growth analyses based on probability fracture mechanics were performed by using the SCC initiation time and the residual stress distribution. As a result, the residual stress d tribution in the axial direction has high tensile stress of approximately 1600 MPa at the inner surface. The effect of S initiation time on leakage probability is not as significant as the effect of plastic strain on the crack growth rate.

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