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

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka

Pages:

1191-1196

Citation:

Y. Iino "Effect of High Temperature Air-Exposure on Room Temperature Fatigue Crack Growth of Ni-Base Single Crystal Superalloy CMSX-10", Key Engineering Materials, Vols. 261-263, pp. 1191-1196, 2004

Online since:

April 2004

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$38.00

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