Abstract
The integrity and residual life assessment of high temperature structures rely on the determined defects in components. The effort has been made to develop tools to detect flows in service-components, and determine crack growth using metallography and fracture mechanical testing. However, less work is done on creep crack initiation and assessment. The experimental determination of creep crack initiation on specimens of P91 steels and weldments and its significance in defect assessment of components are reported. An attempt is made to define creep crack initiation using both fracture mechanics test data. Test method, data analysis and defect assessment approach are addressed.
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