Square Cold Crucible Directional Solidification Of Ti-Al Based Alloys

In this paper, a water-cooling cold crucible with square cross section is designed and manufactured, which meets the need of experiment in crucible size, slits, cooling water. The distribution and intensity of magnetic flux density inside the square cold crucible is calculated by using ANSYS software, while the distribution of electromagnetic field with unloaded is measured through the method of small coil, and transverse and longitudinal in different power and different coil turns are studied, respectively, which shows magnetic flux density is very strong in the area of coils and its maximum appears in the middle position. In the area of non-coils, magnetic flux density decreases dramatically. The distribution of magnetic flux density is uniform to a great extent in the area of coil and the value increases with the increasing of power and becomes more uniform with the increasing of coil turns.The distribution of electromagnetic field with loaded is modeled and calculated which is compared to that of unloaded. The influence of power, frequency, electric current density, coil turns and the location of down-ingot to electromagnetic field is study. The results of calculation show that the distribution of electromagnetic field with loaded is very different from that of unloaded and the former is gathered in the front and skin of ingots.The experiments of the directional solidification of TiAl-based alloys are launched. The effect of technological parameters, especially withdrawal velocity and the thermal history of melting-metal, to the stability of planar interface is researched and thermal gradient in the front of solid-liquid is analyzed. Summarize the conditions of obtaining the parallel and compact columnar. Finally, the tensile performances of the ingots we get from directional solidification are tested and the structures and evolvement of interface of that are analyzed through combining the theory of directional solidification.