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基于强化相γ′的筏化-解筏和粗化的细观过程,本文推导了一组用于描述镍基单晶合金蠕变变形过程的蠕变方程,并在950℃和760℃标定了国产DD3镍基单晶合金不同晶体取向的模型参数,与实验结果比较,所提模型可以准确地描述蠕变的主要阶段。将所提模型用于蠕变性能的晶体取向相关性分析,可以证实,十二面体和六面体滑移系都是可开动的滑移系,晶体取向相关性表现在十二面体滑移系的材质劣化模型参数,其细观机理为筏化规律的晶体取向相关性,结合所提第二阶段结束判据,所提模型可以较好地描述蠕变的主要阶段,这对于充分利用这种材料的性质储备是至关重要的。
Based on the microscopic process of raft-de-raft and coarsening of the enhanced phase γ ’, a set of creep equations for describing the creep deformation process of nickel base single crystal alloys is deduced and calibrated at 950 ℃ and 760 ℃ Compared with the experimental results, the model parameters of domestic DD3 nickel-based single crystal alloys with different crystal orientations can accurately describe the main phases of creep. Using the proposed model for the correlation analysis of the crystal orientation of creep properties, it can be confirmed that both dodecahedron and hexahedron slip systems are actuable slip systems, and the crystal orientation dependence is shown in the material of the dodecahedron slip system Degradation model parameters, the meso-mechanism of the law of the raft of the crystal orientation correlation, combined with the second stage of the end criterion, the proposed model can better describe the main stages of creep, which make full use of this material The nature of reserves is crucial.