Strong pulse current orientated solidification grain ultra-fining method and device

Abstract

The invention discloses a strong pulse current orientated solidification grain ultra-fining method and a strong pulse current orientated solidification grain ultra-fining device. The device comprises a heating controller, a drawing transmission mechanism, a supporting body, an orientated solidification furnace, a cantilever table, a fixing bracket and a pulse power source. The heating controller is connected with a resistance wire of the orientated solidification furnace through a lead and a thermocouple; the thermocouple is inserted into an inner wall of the orientated solidification furnace; and the power-on and power-off states by heating an electrically melt alundum tube in an inner ring of the orientated solidification furnace are adjusted in real time according to an inner temperature value of the orientated solidification furnace, which is measured and transmitted by the thermocouple in real time so as to fulfill the aim of controlling the internal temperature of the orientated solidification furnace. The pulse power source is connected with hot and cold end electrodes through leads, and the control of the pulse current is finished according to a electric pulse parameter regulating command. A cylindrical solidification structure with fine grain dimension and uniform orientation is obtained on the premise of simple and convenient equipment, effect is obvious, the harm of electromagnetic radiation can be reduced and the environmental burden is lightened.

Description

technical field [0001] The invention relates to a method and a device for ultra-refinement of crystal grains by strong pulse current directional solidification, and belongs to the technical field of directional solidification and electric metamorphism pulse treatment. Background technique [0002] The grain size and grain orientation of the metal structure have a great influence on the mechanical properties of metal materials. There are also many methods for grain refinement. In the traditional method, the effect of increasing the cooling rate and supercooling degree, low-temperature pouring, mechanical stirring, etc. to promote grain refinement is limited, and it is difficult to realize, and when the mechanical stirring intensity is too high, it is easy to roll during the solidification process. Air and impurities form shrinkage cavities, segregation and other defects, which greatly affect the mechanical properties of metal materials; chemical treatment method is to add a ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems in the prior art due to complex devices, high production costs, and difficulty in obtaining ultra-fine directional solidification structures with small radial dimens

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