Abstract
Previously, high temperature creep crack growth tests and 3-dimensional elastic-plastic creep FE analyses were conducted for a CT specimen-with the heat affected zone of weld joints for W added 9%Cr ferritic heat resistant steel, ASME grade P92. The multi-axial stress field in the heat affected zone (HAZ) was found to be caused by plastic constraint induced by a decrease in hardness of the HAZ as compared with that of a base metal. In this paper, using a circular notched round bar specimen, which causes the multi-axial stress field induced by plastic constraint, of welded joint for P92 steel, high temperature creep crack growth tests were conducted and the effect of multi-axial stress (structural brittleness) was investigated.
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