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Effects of heat-treatment on the high-temperature ductility and fracture of 20 Cr/25 Ni/Nb stabilised austenitic steel

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Abstract

Stabilisation of 20 Cr/25 Ni steel by niobium not only increased the creep resistance but eliminated the tendency for cracking and thereby enhanced the ductility. No change in density was detected in fine-grained specimens solution-treated at 1000° C until well into tertiary creep, and elongations of 75 to 150% were obtained. After a solution-treatment at 1250° C the creep resistance was further increased and denuded zones were formed near grain boundaries. This caused the strain to be concentrated in grain boundary regions during creep, leading to the formation of both surface- and wedge-cracks at grain boundaries. However, in contrast to a niobium-free steel, these did not nucleate until the end of the secondary creep.

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Author notes

  1. A. Gittins

    Present address: Melbourne Research Laboratories, Broken Hill Proprietary Co Ltd, Clayton, Victoria, Australia

Authors and Affiliations

  1. Materials Division, Central Electricity Research Laboratories, Leatherhead, Surrey, UK

    A. Gittins

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  1. A. Gittins
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Gittins, A. Effects of heat-treatment on the high-temperature ductility and fracture of 20 Cr/25 Ni/Nb stabilised austenitic steel. J Mater Sci 5, 233–239 (1970). https://doi.org/10.1007/BF00550999

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  • DOI: https://doi.org/10.1007/BF00550999

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