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A True-Stress Creep Model Based on Deformation Mechanisms for Polycrystalline Materials

机译:基于变形机制的多晶材料真应力蠕变模型

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A true-stress creep model has been developed based on well-recognized deformation mechanisms, i.e., dislocation glide, dislocation climb, and grain boundary sliding. The model provides a physics-based description of the entire creep deformation process with regards to the strain-time history (primary, secondary, and tertiary creep), rupture strain and lifetime, which finds good agreement with experimental observations for Waspaloy. A deformation-mechanism map is constructed for Waspaloy, and a creep failure criterion is defined by the dominant deformation mechanisms leading to intergranular/transgranular fracture. Thus, the model is a self-consistent tool for creep life prediction.
机译:基于公认的变形机制,即位错滑移,位错爬升和晶界滑动,已经开发了真应力蠕变模型。该模型提供了关于应变时间历史(一次,二次和三次蠕变),断裂应变和寿命的整个蠕变变形过程的基于物理学的描述,这与Waspaloy的实验观察结果非常吻合。为Waspaloy构造了一个变形机制图,并通过导致晶间/跨晶断裂的主要变形机制定义了蠕变破坏准则。因此,该模型是蠕变寿命预测的自洽工具。

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