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The effect of volume percent of fine γ’ on creep in Ds Mar-M200 + Hf

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Abstract

A correlation was found to exist between creep life at 1800∮F (1255 K) and the volume percent of uniformly dispersed fine (<0.5 μm) gamma prime (γ’) precipitate in direction-ally solidified (DS) Mar-M200 + Hf turbine blade castings. A three-fold increase in creep-rupture life was realized when the amount of fine γ’ increased from about the 30 pct level to approximately a 45 vol pct level. Heat treatment studies revealed that the amount of finey’ developed in this alloy is strongly dependent on solution temperature, especially in the range from 2160 to 2210∮F (1455 to 1483 K). Higher solution temperatures promote the development of greater amounts of fine y’ by more complete solutioning of the coarse γ’ and eutectic γ-γ’ constituents which subsequently reprecipitate as fine y’ upon cooling and aging.

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Authors and Affiliations

  1. Pratt & Whitney Aircraft, 06108, East Hartford, CT

    J. J. Jackson, M. J. Donachie (Senior Materials Project Engineers), M. Gell (Senior Materials Project Engineers) & R. J. Henricks (Assistant Materials Project Engineer)

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  1. J. J. Jackson
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  2. M. J. Donachie
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  3. M. Gell
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  4. R. J. Henricks
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formerly Senior Materials Engineer, Pratt & Whitney Aircraft, is now with General Electric Co., Schenectady, NY. 12345.

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Jackson, J.J., Donachie, M.J., Gell, M. et al. The effect of volume percent of fine γ’ on creep in Ds Mar-M200 &#x002B; Hf. Metall Trans A 8, 1615–1620 (1977). https://doi.org/10.1007/BF02644867

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