Journal of Materials Science

, Volume 40, Issue 5, pp 1217–1228 | Cite as

Crack growth in a new nickel-based superalloy at elevated temperature

Part I Effects of loading waveform and frequency on crack growth
Article

Abstract:

Crack growth at elevated temperature has been examined in a new fine-grained nickel-based superalloy under triangular, fast-slow, slow-fast, dwell and sustained loading conditions at 650 and 725C. The effect of loading waveform seems to be minimal for base frequencies over 0.01 Hz with a mixture of time and cycle dependent crack growth observed for all but the fast-slow waveform, where the crack growth remained cycle-dependent and the crack growth rate mostly constant. For base frequencies less than 0.01 Hz, crack growth under dwell load clearly accelerated and the crack growth rates were comparable with those under sustained load. Creep contribution was found to be negligible while crack tip constraint may be relevant to the out-of-plane crack growth observed under predominantly sustained load conditions.

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Department of Mechanical and Design EngineeringUniversity of PortsmouthPortsmouthUK
  2. 2.Department of Mechanical and Design EngineeringUniversity of PortsmouthPortsmouthUK

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