Effect of Shell Temperature on the Dendrite Structure of DZ22B Alloy Blade
Taking DZ22B nickel-based superalloy blade as the object,the temperature field,hot tearing tendency and microstructure of the casting blade during directional solidification at different shell holding temperatures were studied by ProCAST numerical simulation and experiment.The results show that:with the increase of the holding temperature of the shell,the isotherm is concave as a whole.The concave degree of the mushy zone at 1 540℃is significantly greater than that at other temperatures,and the HTI results of the blade increase.The area prone to hot tearing is concentrated on the upper part of the blade,and the area prone to hot tearing at the exhaust edge is larger than that at the inlet edge.The dendrite spacing of the exhaust side of the blade at the same height is less than that of the inlet side.With the increase of the holding temperature of the shell,the primary dendrite spacing and the secondary dendrite spacing decrease.Comparing the simulation results with the experimental statistics of the primary dendrite spacing and the secondary dendrite spacing,the consistent conclusion is drawn,and the simulation is in good agreement with the experiment.
DZ22B high temperature alloydirectional solidificationdendritic structureshell temperaturenumerical simulation
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