Effects of dynamic strain ageing on fatigue crack propagation and threshold behaviour in a Ni-base superalloy

R.A. Venables, J.E. King

Research output: Chapter in Book/Published conference outputConference publication

Abstract

In the temperature range 200-400 degree C the Ni-base superalloy, N901, develops marked dynamic strain ageing effects in its tensile behavior. These include inverse strain rate sensitivity, especially in UTS values, strongly serrated stress-strain curves and a heavily sheared failure mode at the higher test-temperatures. As for steels these effects seem to be due to interactions between the dislocations and the interstitial carbon atoms present. The results of tensile and fatigue threshold tests carried out between 20 degree C and 420 degree C are reported and the fatigue behavior is discussed in terms of the effects of surface roughness induced closure, temperature and strain aging interactions.
Original languageEnglish
Title of host publicationFatigue 84
Subtitle of host publicationproceedings of the 2nd International conference on fatigue and fatigue thresholds; Birmingham, 3-7 September 1984
EditorsC.J. Beevers, J. Backlund, P. Lukacs, J. Schijve, R.O. Ritchie
Pages1371-1378
Number of pages8
Volume3
Publication statusPublished - Dec 1984
Event2nd international conference on fatigue and fatigue thresholds - Birmingham, United Kingdom
Duration: 3 Sept 19847 Sept 1984

Conference

Conference2nd international conference on fatigue and fatigue thresholds
Abbreviated titleFatigue 84
Country/TerritoryUnited Kingdom
CityBirmingham
Period3/09/847/09/84

Keywords

  • measurements fatigue of materials
  • fatigue gas turbines
  • high temperature metals testing
  • dynamic strain ageing
  • near-threshold fatigue cracks
  • serrated stress-strain curves
  • super alloy N901
  • turbine-discs
  • nickel and alloys

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