Abstract

It is important to be able to predict the creep life of materials used in power plants and in aeroengines. This paper develops a new parametric creep model that extends those put forward by Wilshire and Yang et al. by having them as restricted or special cases of a new generalized model. When this generalized model was applied to failure time data on 316H stainless steel it was found that neither of these established parametric models explained the greatest variation in the experimentally obtained times to failure. Instead, a version of this generalized model was most compatible with the experimental data. It was further found that the activation energy for this material changed at a normalized stress of 0.41 due to a change from the domination of dislocation movement within grains to movement within grain boundaries. Finally, when the generalized model was used to predict failure times beyond 5000 hours (using only the shorter test times), the new generalized model had better predictive capability at most temperatures.

中文翻译：

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通过统一一些现代蠕变参数模型测试模型结构：在316H不锈钢中的应用

摘要

重要的是能够预测发电厂和航空发动机中使用的材料的蠕变寿命。本文开发了一个新的参数蠕变模型，该模型扩展了Wilshire和Yang等人提出的模型。通过将它们作为新的广义模型的受限或特殊情况。当将此通用模型应用于316H不锈钢的失效时间数据时，发现这些既定参数模型都无法解释实验获得的失效时间的最大变化。相反，此通用模型的版本与实验数据最兼容。进一步发现，该材料的活化能在归一化应力为0.41时发生了变化，这是由于从晶粒内位错运动的支配向晶粒内运动的变化所致。最后，当使用广义模型预测超过5000小时的故障时间（仅使用较短的测试时间）时，新的广义模型在大多数温度下具有更好的预测能力。