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A primary creep model for Class M materials

机译：M类材料的基本蠕变模型

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In many high temperature applications the accumulation of creep strain during the primary stage cannot be ignored since most of the allowable design strain occurs in this stage. An appropriate modelling is therefore needed. In this work, a mechanism based model for primary creep has been derived assuming that the creep rate in the transient regime can be given as a function of the steady state creep rate and the internal stress. Taking into account that the apparent activation energy varies with the internal stress and that the internal stress kinetics can be given as a function of strain, an exponential form of the creep rate versus creep strain has been obtained. The proposed model has been applied to high chromium steel P91 and Rene 80 nickel based superalloy. The decay constant and scaled activation volume have been found to vary only with the applied stress and not with temperature. The evolution of the these two parameters with stress seems to indicate the stress at which the transition from diffusional flow to dislocation climb creep occurs.
机译：在许多高温应用中，初级阶段蠕变应变的累积是不容忽视的，因为大多数允许的设计应变都发生在该阶段。因此，需要适当的建模。在这项工作中，假设在瞬态状态下的蠕变速率可以作为稳态蠕变速率和内应力的函数给出，则得出了基于机械的初级蠕变模型。考虑到表观活化能随内部应力而变化，并且内部应力动力学可以作为应变的函数给出，因此获得了蠕变速率与蠕变应变的指数形式。该模型已应用于高铬钢P91和Rene 80镍基高温合金。已经发现衰减常数和按比例缩放的激活体积仅随所施加的应力而变化，而不随温度变化。这两个参数随应力的演变似乎表明了从扩散流到位错爬升蠕变过渡的应力。

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