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Metallurgical and Materials Transactions A

, Volume 38, Issue 6, pp 1177–1183 | Cite as

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

  • M. Lamm
  • R.F. Singer
Article

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.

Keywords

Fatigue Fatigue Life Solidification Condition Mushy Zone Shrinkage Porosity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully acknowledge the financial and material support from Doncasters Precision Castings, Bochum, Germany, especially Dr. Lüsebrink and Dr. Busse. Also, we thank the German Federal Ministry for Education and Research for financial support (Grant No. 03N2021).

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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007

Authors and Affiliations

  1. 1.Material Engineering and Testing, Failure AnalysisAREVA NP GmbHErlangenGermany
  2. 2.Department of Materials Science and Engineering, Institute of Science and Technology of MetalsUniversity of Erlangen–NurembergErlangenGermany

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