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首页> 外文会议>New developments on metallurgy and applications of high strength steels >CREEP LIFE PREDICTIONS IN 9 CR FERRITIC STEELS
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CREEP LIFE PREDICTIONS IN 9 CR FERRITIC STEELS

机译：9％CR铁素体钢的蠕变寿命预测

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摘要

A model is described that makes possible the prediction of precipitate nucleation, growth and coarsening in high alloy ferritic steels. The model uses an innovative Monte Carlo procedure to forecast the distribution of precipitates in a spatially resolved manner. Grain boundary effects are also considered. The output from such a model is more comprehensive than Avrami-type models, in that particle size distribution, size and inter-particle spacing are predictable, as well as precipitate volume fraction. The precipitation sequence is divided into small time steps so that the precipitate state can be viewed at any prescribed time. These data for all precipitates present in the steels at a series of discrete time intervals are fed into a continuum damage mechanics model to forecast the whole creep curves for the material. This information can be produced for any temperature or stress. By setting the level of strain at which failure will occur, stress rupture life can also be predicted by the models. Examples of applications of the model to P91 steel will be given. Model predictions of microstructural evolution in heat affected zones in P91 are also presented.
机译：描述了一个模型，该模型可以预测高合金铁素体钢中析出物的形核，生长和粗化。该模型使用创新的蒙特卡洛程序以空间分辨的方式预测沉淀物的分布。还考虑了晶界效应。这种模型的输出比Avrami型模型更全面，因为可预测粒度分布，大小和粒子间间距以及沉淀物体积分数。沉淀顺序分为几个小步骤，因此可以在任何规定的时间查看沉淀状态。这些以一系列离散时间间隔存在于钢中的所有析出物的数据被输入到连续损伤力学模型中，以预测材料的整个蠕变曲线。可以针对任何温度或压力产生此信息。通过设置发生破坏的应变水平，模型也可以预测应力断裂寿命。将给出该模型在P91钢上的应用示例。还介绍了P91中热影响区的微结构演变的模型预测。

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