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On the thin-section size dependent creep strength of a single crystal nickel-base superalloy

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Abstract

The combined effects of thin-section size, D, and microcracks on the creep behaviour of the single crystal MAR-M002 were investigated at the creep conditions of 300 MPa and 900 °C. It was observed that the creep rupture life, t R is controlled by the mean microcrack size to thin-section size, (d c/D), (or the total number, (N m), of the mean-sized microcrack particles across the diameter, assuming D/d c=Nm); reducing N m continuously improves t R. The creep rupture strain (or ductility), ε R, can be improved sharply by increasing the total number, N T, of microcrack particles across the cross-section, N T ∝ D 2 N A, where N A is the number of microcrack particles (cavity density) per cross-section. The behaviour of the creep rupture ductility was interpreted in terms of the weakest link, or “largest-flaw” concept; the observation of the higher proportion of the less likely dangerous (smaller in size) microcracks with increasing N T was the underlining reason for the improvement in ductility.

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  1. Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, Mersin 10, Turkey

    A. Baldan

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Baldan, A. On the thin-section size dependent creep strength of a single crystal nickel-base superalloy. Journal of Materials Science 30, 6288–6298 (1995). https://doi.org/10.1007/BF00369679

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