Gao, N., Brown, M.W. and Miller, K.J.
Short crack coalescence and growth in 316 stainless steel subjected to cyclic and time dependent deformation
Fatigue and Fracture of Engineering Materials and Structures, 18, (12), . (doi:10.1111/j.1460-2695.1995.tb00866.x).
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A study has been undertaken into short crack growth behaviour of AISI type 316 stainless steel under creep-fatigue conditions at 550 degrees 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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