Article
 

Fatigue Crack Growth Mechanisms for Nickel-based Superalloy Haynes 282 at 550-750° C

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/nc580p09n

Descriptions

Attribute NameValues
Creator
Abstract
  • The fatigue crack growth rates for nickel-based superalloy Haynes 282 were measured at 550, 650, and 750 °C using compact tension specimens with a load ratio of 0.1 and cyclic loading frequencies of 25 and 0.25 Hz. The crack path was observed to be primarily transgranular for all temperatures, and the observed effect of increasing temperature was to increase the fatigue crack growth rates. The activation energy associated with the increasing crack growth rates over these three temperatures was calculated less than 60 kJ/mol, which is significantly lower than typical creep or oxidation mechanisms; therefore, creep and oxidation cannot explain the increase in fatigue crack growth rates. Transmission electron microscopy was done on selected samples removed from the cyclic plastic zone, and a trend of decreasing dislocation density was observed with increasing temperature. Accordingly, the trend of increasing crack growth rates with increasing temperature was attributed to softening associated with thermally assisted cross slip and dislocation annihilation.
  • Keywords: electron microscopy, mechanical characterization, fatigue, nickel-based superalloys
  • Keywords: electron microscopy, mechanical characterization, fatigue, nickel-based superalloys
Resource Type
DOI
Date Available
Date Issued
Citation
  • Rozman, K. A., Kruzic, J. J., Sears, J. S., & Hawk, J. A. (2015). Fatigue Crack Growth Mechanisms for Nickel-based Superalloy Haynes 282 at 550-750° C. Journal of Materials Engineering and Performance, 24(10), 3699-3707. doi:10.1007/s11665-015-1678-8
Journal Title
Journal Volume
  • 24
Journal Issue/Number
  • 10
Rights Statement
Funding Statement (additional comments about funding)
  • This work was funded by the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL)-Strategic Center for Coal, managed by Robert Romanosky (Technology Manager) and Charles Miller (Technology Monitor).
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details KruzicJamieMIMEFatigueCrackGrowth.pdf 2017-07-25 Public Download