Influences of heating temperature and cooling water temperature on nucleation rates of equiaxed and columnar grains,and the position of CET were investigated by experiments.Experimental results show that the fraction of equiaxed grains increases with the decrease of the heating temperature and the increase of the cooling water temperature.The nucleation rate of the equiaxed and columnar grains increases when the cooling water temperature and heating temperature decrease.Furthermore,applicability of the typi...