|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Characteristics and Application Properties of Metals and Non-metals for Technology: An EPD Symposium in Honor of Donato Firrao
||Creep-oxidation-small Fatigue Crack Interaction in Grade 91 Steel
||Sumit Bahl, Sebastien Dryepondt, Lawrence Allard, Satyam Suwas, Amit Shyam
|On-Site Speaker (Planned)
This presentation will report an unusual effect of hold time on the rate of growth of creep-fatigue small cracks at 550° C in Grade 91 steel. It was found that the introduction of hold time (up to 10 s) led to a slight reduction in crack growth rate while higher hold times (> 100 s) even led to complete arrest of the crack. Microstructural analyses were performed to determine the responsible deformation and oxidation mechanisms. It will be shown that with the introduction of a hold time an enhanced rate of cyclic softening and oxidation was responsible for the reduction in the crack growth rate as well as the complete arrest of the crack under creep-fatigue conditions. A model that incorporates the contribution of oxidation and deformation mechanisms in creep-small fatigue crack growth will be presented.
||Planned: Supplemental Proceedings volume