Effect of High Temperature Air-Exposure on Room Temperature Fatigue Crack Growth of Ni-Base Single Crystal Superalloy CMSX-10

Abstract:

Room temperature fatigue crack growth behaviour of un-exposed(as-received) and high temperature air-exposed(at 1100°C for 24 to 1000 h) CMSX-10 was investigated. A small compact tension specimen with [001] loading direction and [110] fatigue crack growth direction was used. The fatigue crack growth results were analyzed using a stress intensity parameter K . It is shown that the air-exposure has no deteriorative effect on the crack growth behaviour, even though the microstructure has changed by the exposure(coarsening of γ' ). The crystallographic facet fracture of (1-11) and (-111) planes appeared and the intersection of the planes forms sets of lines(ridge and valley) parallel to [110] direction. The fatigue crack tip front is schematically shown.

• Periodical: Key Engineering Materials (Volumes 261-263)
• Pages: 1191-1196
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.261-263.1191
• Online since: April 2004
• Authors: Y. Iino
• Keywords: Crystallographic Facet Fracture, Fatigue Crack Growth (FCG), Fractography, High Temperature Air Exposure, Nickel-Based Superalloy, Single Crystal

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