Low and High Cycle Fatigue Behavior of Nickel-base Alloy att High Temperatures
2013 (English)Conference paper (Refereed)
Low and high cycle fatigue behaviors of Alloy 690 have been investigated at temperatures up to 330 °C and number of cycles up to 2 × 109. Two interesting phenomena were observed. At high temperature, the alloy shows a secondary strain hardening in the cyclic stress-strain response. Formation of nano-twins and interactions between moving dislocations and stacking faults or interstitial atoms could contribute to this secondary strain hardening. For very high cycle fatigue, subsurface fatigue crack initiation at grain boundaries has been observed. EBSD investigation shows that strain accumulation is much localized. The fatigue damage is a localised plasticity exhaustion process.
Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 55, 671-676 p.
Nickel base alloy, dynamic strain ageing, low cycle fatigue, high cycle fatigue, cyclic deformation, plasticity exhaustion
Engineering and Technology Materials Engineering
IdentifiersURN: urn:nbn:se:liu:diva-103000DOI: 10.1016/j.proeng.2013.03.313OAI: oai:DiVA.org:liu-103000DiVA: diva2:685307
6th International Conference on Creep, Fatigue and Creep-Fatigue Interaction