Development of strengthening technique of heat resisting structural materials for the next generation power plant with decreased carbon dioxide emission

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High chromium heat resisting steels are used for structural components of high-efficient thermal power plants. The degradation of high temperature strength of weldment during long-term use recently becomes a serious problem. In the present research, the processes and mechanisms of the damage and fracture of these steel welds at high temperatures were clarified. Further, new high chromium steels with higher grain boundary strength were developed. Creep lives of the developed steel welds were five times longer than the conventional high chromium steel welds, because creep damages formed on the grain boundaries were suppressed. Damage suppression mechanisms and life prediction equations in the developed steel welds were investigated.