Application of fracture mechanics to the surface crack propagation in stainless steel at elevated temperatures

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Abstract The propagation of small surface cracks in SUS 304 stainless steel is examined at elevated temperatures. In the temperature region studied, the crack growth is mainly cycle-dependent. When temperature is higher than 500°C, creep-dependent crack growth becomes dominant which results in a larger crack growth rate. By confirming that the surface crack maintains a semi-elliptic shape during its growth and by investigating the cyclic deformation behavior of the material, elastic-plastic fracture mechanics parameters are evaluated and used to correlate the crack growth rate. Both the J integral range ΔJ, and the effective J integral range ΔJeff, which accounts for the crack closure effect, are found to be excellent to consolidate crack growth rates for the high temperature fatigue conditions.

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