Effects of microstructure, temperature and R-ratio on fatigue crack propagation and threshold behaviour in two Ni-base alloys

King, J.E.; Venables, R.A. and Hicks, M.A. (1984). Effects of microstructure, temperature and R-ratio on fatigue crack propagation and threshold behaviour in two Ni-base alloys. IN: Advances in fracture research. Taplin, S.R.; Rao, D.M.R.; Rama, P.; Knott, J.F.; Dubey, R. and Valluri, S.R. (eds) Oxford (UK): Pergamon Press.

Abstract

Fatigue crack propagation and threshold data for two Ni-base alloys, Astroloy and Nimonic 901, are reported. At room temperature the effect which altering the load ratio (R-ratio) has on fatigue behaviour is strongly dependent on grain size. In the coarse grained microstructures crack growth rates increase and threshold values decrease markedly as R rises from 0. 1 to 0. 8, whereas only small changes in behaviour occur in fine grained material. In Astroloy, when strength level and gamma grain size are kept constant, there is very little effect of processing route and gamma prime distribution on room temperature threshold and crack propagation results. The dominant microstructural effect on this type of fatigue behaviour is the matrix ( gamma ) grain size itself.

Divisions: Aston University (General)
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Event Title: 6th International Conference on Fracture
Event Type: Other
Event Dates: 1984-12-04 - 1984-12-10
Uncontrolled Keywords: fatigue of materials,astroloy fracture surfaces,elevated temperature threshold values,fatigue crack propagation,microstructure temperature,threshold values,nickel and alloys
Published Date: 1984-12-01

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