INFLUENCE OF CRYSTAL ORIENTATION ON THE PRIMARY DENDRITE ARM SPACING OF A SINGLE CRYSTAL SUPERALLOY
晶体取向对单晶高温合金一次枝晶间距的影响

A model for relating the primary dendrite arm spacing to the crystalorientation has been developed.An experiment for investigating the primary dendrite arm spacing in single crystal superalloy DD8 has also been carried out.The results indicate that the primary dendrite arm spacing decreases when the preferred orientation of the dendrite deviates from the solidified direction.The influence of the crystal orientation on the primary dendrite arm spacing is much slight with higher thermal gradient and higher solidification rate.The experimental results are consistent with the prediction of the model.