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This document summarizes a study of stress relaxation cracking in a 347H steel pipe-shoe weldment after 5 years of service in a petroleum refinery. The researchers conducted detailed metallurgical analysis to investigate the microstructure and failure mechanism. They found cracks initiated at the weld toe and propagated intergranularly. Insufficient precipitation strengthening and grain boundary cavitation contributed to cracking. The non-uniform thermal gradient during service led to more cavities near the

Author

ahmad exsan

Language

EN