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Creep mechanisms in oxide-dispersion-strengthened alloys

机译:氧化物弥散强化合金的蠕变机理

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Analyses of the creep properties of oxide-dispersion-strengthened (ODS) alloys in relation to the creep characteristics observed for prestrained nickel suggest that the principal role of dispersoid particles is to stabilize the retained dislocation substructures present after thermomechanical processing. On this basis, straight-forward explanations can be provided not only for the depdnedence of creep strength on grain size and shape but also for the pronounced creep anisotropy of ODS alloys with high grain aspect ratios. Furthermore, even the complex power-law behavior patterns displayed by commercial ODS ferritic steels can then be predicted and explained using the #theta# relationships which quantify creep curve shapes.
机译:氧化物弥散强化(ODS)合金的蠕变特性与预应变镍的蠕变特性相关的分析表明,弥散体颗粒的主要作用是稳定热机械加工后存在的保留的位错亚结构。在此基础上,不仅可以简单地说明蠕变强度对晶粒尺寸和形状的依赖性,而且可以提供对于具有高晶粒长宽比的ODS合金明显的蠕变各向异性的解释。而且,甚至可以使用量化蠕变曲线形状的#theta关系来预测和解释甚至由商用ODS铁素体钢显示的复杂幂律行为模式。

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