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Effects of composition and microstructure on fatigue of γ/γ′-δ type eutectic alloys

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Abstract

Room temperature tension-tension fatigue tests were performed on two lamellar γ/γ′-δ alloys, one with 0 pct Cr and one with 6 pct Cr. The 6 pct Cr alloy was solidified at 3 cmJh while the 0 pct Cr alloy was solidified at 3 cm/h and 5.7 cm/h. Fatigue testing was done on both alloys in the as-directionally solidified condition and on the 0 pct Cr alloy after heat treatment. Increasing the growth speed of the 0 pct Cr alloy increased the fatigue life of the material at stresses above the 107 cycle fatigue limit. Partial solution treating and aging of the 0 pct Cr alloy,R = 3 cm/h, increased the fatigue life relative to the as-directionally solidified material at high stresses, to the same extent as increasing the growth speed. Full solution treatment and aging of the 0 pct Cr alloy,R = 5.7 cm/ h, caused a reduction in the fatigue life relative to the as-directionally solidified material. Fatigue cracking tended to be faceted in the 6 pct Cr alloy as opposed to the more ductile failure of the 0 pct Cr alloy. Microstructural perfection, grain size and shape, interlamellar spacing, longitudinal cracking, and longitudinal and transverse ductility all are believed to have influenced the fatigue resistance of the alloys.

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Authors and Affiliations

  1. Aircraft Engine Group, General Electric, 01910, Lynn, MA

    J. E. Grossman (Materials Engineer)

  2. Rensselaer Polytechnic Institute, 12181, Troy, NY

    N. S. Stoloff (Professor of Materials Engineering)

Authors
  1. J. E. Grossman
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  2. N. S. Stoloff
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Grossman, J.E., Stoloff, N.S. Effects of composition and microstructure on fatigue of γ/γ′-δ type eutectic alloys. Metall Trans A 9, 117–125 (1978). https://doi.org/10.1007/BF02647180

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  • DOI: https://doi.org/10.1007/BF02647180

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