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Creep behavior of Ni-Cr lamellar eutectic alloy

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Abstract

The structural changes that occur during creep deformation at 625° and 760°C, with creep and creep rupture data of a directionally solidified Ni-Cr lamellar eutectic alloy are presented and discussed. It is shown that the characteristic features of stage I deformation are the formation of dislocation tangles in the nickel-rich phase and shearing of the cellular structure; these features are then carried into stage II without any additional changes. The onset of accelerated creep is associated with the fracture of the chromium-rich lamellae. During this stage well-defined dislocation cells are formed. More than an order of magnitude increase in lifetime over cast specimens is obtained in the lamellar material with intermediate results for partially dendritic specimens. The activation enthalpy for creep is strain dependent, increasing from about 40 kcal per mole at low strains to a constant value of 80 kcal per mole at about 2 pct plastic strain. Stress dependence of steady-state creep for both test temperatures conforms to the expression έ =Aσ n witha − 7 for the lamellar eutectic anda − 5 for cast specimens.

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  1. Westinghouse Research Laboratories, Pittsburgh, Pa.

    Ram Kossowsky (Senior Metallurgist)

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  1. Ram Kossowsky
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Kossowsky, R. Creep behavior of Ni-Cr lamellar eutectic alloy. Metall Trans 1, 1909–1919 (1970). https://doi.org/10.1007/BF02642791

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  • DOI: https://doi.org/10.1007/BF02642791

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