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首页> 外文期刊>International Journal of Plasticity >A homogenized primary creep model of nickel-base superalloys and its application to determining micro-mechanistic characteristics
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A homogenized primary creep model of nickel-base superalloys and its application to determining micro-mechanistic characteristics

机译：镍基超合金的均质初级蠕变模型及其在确定微型机械特性的应用

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摘要

A primary creep model of nickel-base superalloys is developed for the low-temperature-high-stress regime, which provides insight into the active micro-mechanisms, extracted from features of the experimental creep curves. A two-parameter model is established to account for the accumulated primary creep strain, which contains a "threshold stress" representing the possible shear resistance during primary creep. Consideration of this threshold stress leads to a stress exponent n in the order of 3 similar to 4, in sharp contrast to the conventional analysis that gives an ultra high value of n 10. A general stress-dependence of dislocation velocity is then proposed based on the framework of thermally-activated deformation, which leads to another two-parameter model for the primary creep rate. Applications to two superalloys demonstrate a good agreement between the model and experimental data. In addition, two micro-mechanistic characteristics of creep, i.e., dislocation drag coefficient and activation volume, can be unambiguously determined from the model parameters. The values of these physical quantities obtained for the two superalloys considered suggest a coupled dislocation motion of glide and climb at the gamma/gamma' interface as the rate-controlling mechanism during primary creep in superalloys.
机译：为低温高应力制度开发了镍基超合金的主要蠕变模型，其提供了对活性微机构的洞察力，从实验蠕变曲线的特征中提取。建立一个双参数模型以考虑累积的初级蠕变应变，其包含表示在初级蠕变期间可能的剪切电阻的“阈值应力”。考虑该阈值应力的考虑与类似于4的3的应力指数n导致应力指数n，其与常规分析鲜明对比，其给出了N＆GT的超高值; 10.基于热激活变形的框架提出了脱位速度的一般应力依赖性，这导致另一个用于初级蠕变率的两参数模型。两个高级合金的应用展示了模型和实验数据之间的良好一致性。另外，可以从模型参数中明确地确定蠕变，即位错阻力卷系数和激活体积的两个微型机械特征。所考虑的两个超合金所获得的这些物理量的值认为，在高温合金中初级蠕变期间的速率控制机构，在Game / Gamma'界面上的耦合偏移运动。

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