不同取向双晶粒结构材料的蠕变行为分析

A macroscopic phenomenological model and a finite element subroutine were used to simulate the creep behavior of bi-crystal structural material with different orientations. The selected creep model had a clear physical significance, and three terms of the creep model can be used to describe the three stages of creep deformation process respectively. The effects of casting deviation angle, secondary orientation and grain boundary of bi-crystal structural material on the creep deformation characteristics were also analyzed. These results indicated that the casting deviation angle can significantly reduce the creep properties of the material based on two rotations of the material coordinate system. The secondary orientation had insignificant effect on the creep behavior of the material, and the inclined grain boundary can change the creep behavior of the material near the grain boundary. The change of the incline angle of grain boundary of the material caused the change of creep deformation behavior near the grain boundaries.