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基于细观两相胞元结构的滑移本构模型,引入高温蠕变筏化机制,并与三维胞元应力应变解析模型结合,模拟了DD3在1 223 K和SRR99在1 123 K及1 253 K下的蠕变筏化.在胞元应力模型中引入细观尺寸变化,提出了判断γ′筏化类型和方向的准则,定量模拟了γ′的高温筏化过程.结果表明:本模型对筏化方向的判断和筏化过程的模拟与试验相吻合,筏化模型的引入使基于细观胞元结构的滑移本构模型可以较准确地模拟单晶材料的高温蠕变行为.
Based on the slip constitutive model of meso-and two-phase cell structure, the high-temperature creep raft mechanism was introduced and combined with the three-dimensional cell stress-strain analytical model to simulate the DD3 at 1 223 K and SRR99 at 1 123 K and 1 253 K, the creep raft was introduced.Metal size variation was introduced into the cell stress model, and the criterion for judging the type and direction of γ 'raft was proposed to quantitatively simulate the high temperature raftization process of γ' .The results show that this model The judgment of the direction of the raft and the simulation of the raft process coincide with the experiment. The introduction of the raft model makes the slipping constitutive model based on the structure of the mesoscopic cell can simulate the high temperature creep behavior of the single crystal material more accurately.