镍基单晶合金高温蠕变筏化模型研究

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.

A rafting model for creep of Ni base single crystal at high temperature based on microstructure cell

A rafting model for creep of Ni base single crystal based on microstructure cell was introduced into the dislocation slip model,and the rafting behaviors during creep of DD3 at 1 223 K and SRR99 at 1 123 K and 1 253 K were described in combination with the cell's analytic stress model.By incorporating the changes of the cell's dimensions into the cell stress model,the criterion of rafting type and direction judgment was determined and the rafting deformation was simulated quantitatively.Both the results of ...