Evolution mechanism of crystallographic orientation in grain continuator bars of a Ni-based single-crystal superalloy prepared by Bridgman technology during directional solidification

Single-crystal rods with different diameters and deviation angles respect to the solidification direction were produced by Bridgman rapid method at withdrawal rates of 3 6 mm·min-1 used as grain continuators. The crystallographic orientation rods, which cross-sections perpendicular heights, was measured electron backscattered diffraction, while corresponding microstructures observed optical microscopy. mushy zone morphology distribution temperature gradient simulated finite element analysis software ProCAST. experimental results indicate that single-crystal corresponds statistical average value all dendrite orientations in cross-section. primary secondary dendrites each rod fluctuates irregularly within a small range (less than 4°). is not exactly consistent other affected their branching mode space. In addition, simulation show shapes change increase height during process. Finally, evolution mechanism influence factors analyzed discussed.