Abstract
Abstract— A study has been undertaken into short crack growth behaviour of AISI type 316 stainless steel under creep‐fatigue conditions at 550°C within the high strain range of 0.9 to 2.5% and including a 60 min hold‐time. During the high‐temperature, reverse‐bending tests, surface crack initiation and growth on both the tensile‐hold and the compressive‐hold sides of circular‐section specimens were monitored by means of a plastic replication technique. Detailed analysis revealed that under creep‐fatigue conditions, the initiation and growth behaviour of many individual cracks and their subsequent coalescence to form a major Stage II (tensile) crack was the dominant feature in the failure process. A life prediction model is proposed which incorporates the process of short crack coalescence. Satisfactory predictions of creep‐fatigue lifetimes are derived from the model.
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