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Creep cavity growth models for austenitic stainless steels

机译：奥氏体不锈钢的蠕变腔增长模型

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Diffusion controlled cavity growth models tend to exaggerate the growth rate. For this reason it is essential to take into account the restrictions caused by creep rate of the surrounding material, so called constrained growth. This has the consequence that the stress that the cavities are exposed to is reduced in comparison to the applied creep stress. Previous constrained growth models have been based on linear viscoplasticity. To avoid this limitation a new model for constrained growth has been formulated. Part of the work is based on a FEM study of expanding cavities in a creeping material. Compared with the previous constrained cavity growth models, the modified one gives lower reduced stresses and thereby lower cavity growth rates. By using recently developed cavity nucleation models, the modified creep cavity growth model can predict the cavity growth behaviour quantitatively for different types of austenitic stainless steels, such as 18Cr10Ni, 17Cr12NiNb and 17Cr12NiTi.
机译：扩散控制的空腔生长模型往往会夸大生长速率。因此，必须考虑到周围材料的蠕变速率所造成的限制，即所谓的约束生长。其结果是，与施加的蠕变应力相比，空腔所承受的应力减小了。以前的约束增长模型已经基于线性粘塑性。为了避免这种限制，已经制定了一种新的约束增长模型。这项工作的一部分是基于对蠕变材料中扩孔的有限元研究。与以前的约束型腔生长模型相比，修改后的模型降低了应力，从而降低了型腔生长速度。通过使用最近开发的腔体成核模型，改进的蠕变腔体生长模型可以定量预测不同类型的奥氏体不锈钢（例如18Cr10Ni，17Cr12NiNb和17Cr12NiTi）的腔体生长行为。

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