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Substructure evolution of Zircaloy-4 during creep and implications for the Modified Jogged-Screw model

机译:Zircaloy-4蠕变过程中的亚结构演变及其对修正的慢动螺旋模型的影响

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摘要

Several specimens of Zircaloy-4 were creep tested at a single stress-temperature condition, and interrupted at different accumulated strain levels. Substructural observations were performed using bright field scanning transmission electron microscopy (BF STEM). The dislocation substructure was characterized to ascertain how creep strain evolution impacts the Modified Jogged-Screw (MJS) model, which has previously been utilized to predict steady-state strain rates in Zircaloy-4. Special attention was paid to the evolution of individual model parameters with increasing strain. Results of model parameter measurements are reported and discussed, along with possible extensions to the MJS model.
机译:Zircaloy-4的几个样品在单一应力温度条件下进行了蠕变测试,并在不同的累积应变水平下中断。使用明场扫描透射电子显微镜(BF STEM)进行亚结构观察。位错亚结构的特征是确定蠕变应变的发展如何影响修正的慢拧螺钉(MJS)模型,该模型以前已用于预测Zircaloy-4的稳态应变率。特别关注随应变增加的各个模型参数的演变。报告并讨论了模型参数测量的结果,以及对MJS模型的可能扩展。

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