The effects of temperature and hold time on dynamic strain ageing in a nickel based superalloy

Jie Tong, Colin Lupton

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    Abstract

    Serrations known as Portevin Le-Chatelier effect have been observed in a coarse grained nickel based superalloy RR1000 in the temperature range from 300 to 750uC. These serrations may be due to dynamic strain aging (DSA), which affects the stress relaxation behaviour of the material. Further experiments have been carried out over a wide range of temperature and under selected loading conditions to interrogate the DSA phenomenon. The results show that, in addition to serrations, the alloy also exhibits unusual strain rate insensitivity and increased strain hardening in the DSA temperature regime. Possible mechanisms of DSA have been explored using transmission electron microscopy (TEM) to examine typical samples tested under selected and well defined loading conditions.
    Original languageEnglish
    Pages (from-to)226-232
    JournalMaterials at High Temperature
    Volume31
    Issue number3
    DOIs
    Publication statusPublished - Aug 2014

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