Axial creep-fatigue damage assessment in type 316 material

摘要

Failure resulting from the interaction of creep-fatigue under a 30- minute hold-time and in low cycle fatigue (LCF) at 620 C (1150 F) was assessed in terms of mechanical and microstructural response. Damage was analyzed by applying two strainranges whereby the effect of plastic strain and creep strain was characterized. A strain rate concept is introduced in this paper for predicting creep-fatigue cumulative damage. The micro-structural response to the interaction process was evaluatedthrough fractographs.