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Erschienen in: Metallurgical and Materials Transactions A 6/2007

01.06.2007

The Effect of Casting Conditions on the High-Cycle Fatigue Properties of the Single-Crystal Nickel-Base Superalloy PWA 1483

verfasst von: M. Lamm, R.F. Singer

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 6/2007

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Abstract

Different solidification conditions are employed to produce sets of single-crystal samples with different primary dendrite arm spacings, i.e., 600 μm, 400 μm, and 250 μm. The material with the smaller dendrite arm spacing is shown to possess considerably increased high-cycle fatigue life. Fatigue cracks are found to originate from shrinkage porosity rather than from carbides, in which the size of the largest pores in the samples scales with the primary dendrite arm spacing. Fatigue life can be rationalized using a fracture mechanics approach based on a Kitagawa–Takahashi plot. The impact of the results with respect to the development of new commercial casting processes that produce higher temperature gradients and cooling rates will be discussed.

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Metadaten
Titel
The Effect of Casting Conditions on the High-Cycle Fatigue Properties of the Single-Crystal Nickel-Base Superalloy PWA 1483
verfasst von
M. Lamm
R.F. Singer
Publikationsdatum
01.06.2007
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 6/2007
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-007-9188-4

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