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P91-type steel is widely used for the high- temperature pipe work components in advanced power plants. It exhibits a considerable high-temperature creep strength, a high corrosion-cracking resistance, a low oxidation rate, and good weldability. According to the relevant standard, plane defects were usually regularization characterized. But, how regularization characterize the plane defects under high temperature were not directly given. Thus, in the paper, elliptical crack was taken as an example. Based on the new combined constitutive mode, the creep crack stress distribution of p91-type steel was studied, and the law of crack interference effective was given. The result shows that the interference effects are still evident, when the distance interference is 2 times the critical interference spacing. Thus, coefficient compensation must be given in safety assessment at high temperatures. The compensation range is 2 times the critical interference spacing. The results provide theoretical support to the formulation of safety assessment standard under high temperature.

Creep Behavior and Crack Interference Effective of P91-Type Steel Under High Temperature