A New Fracture Analysis of Weld Cracks by Means of Recrystallization Method

概要

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Recrystallization method is applied to fracture analysis of weld cracks in weldable high strength steels, i.e. hydrogen-induced cold crack, stress-relief crack and solidification crack. In this method, cracked specimen is heat-treated to recrystallize intense plastic deformed region around the crack, and then recrystallized grain size at crack surface and recrystallized zone width are measured and utilized as factors to identify the type of crack and stress condition. It is shown that recrystallization behavior is different among hydrogen-induced cold crack, stress-relief crack and solidification crack. Thus, recrystallization method as fracture analysis is available when crack surface is inadequate for execution of electron microfractography due to its oxidization or contamination. It is also shown as regards hydrogen-induced cold crack that magnitude of restraint stress is reflected on recrystallization behavior.
大阪大学の論文