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Creep inhibition at grain boundaries in a stainless steel

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Abstract

The inhibition of creep in a vanadium alloyed austenitic stainless steel has been found to rely upon heterogeneous precipitation of vanadium nitride both on matrix and grain bound-ary dislocations together with the formation of M23C6 grain boundary carbides. The effect of these precipitation reactions on the separate stages of the creep test has been investi-gated microstructurally, particularly with reference to the processes occurring at grain boundaries. Dislocation configurations in grain boundaries, especially in the region of grain boundary carbides are modified by the presence of vanadium nitride precipitates. It is suggested that the roles of M23C6 and vanadium nitride precipitation during creep of this steel are interrelated and complimentary in reducing creep rates and extending creep ductility.

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  1. Laboratory of Applied Physics I, DK, Technical University of Den-mark, 2800, Lyngby, Denmark

    A. Horsewell (Research Fellow)

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  1. A. Horsewell
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Horsewell, A. Creep inhibition at grain boundaries in a stainless steel. Metall Trans A 9, 1843–1847 (1978). https://doi.org/10.1007/BF02663418

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  • DOI: https://doi.org/10.1007/BF02663418

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