Substrate cooling device based on directional solidification characteristic for promoting laser additive reproduction

Abstract

The invention relates to a substrate cooling device based on the directional solidification characteristic of promoting laser additive reproduction. The substrate cooling device comprises a tank body.The top surface of the tank body is recessed downward to form a water tank with an upward opening. An inlet for inputting a cooling medium into the water tank is formed in one side of the tank body.An outlet for draining the cooling medium in the water tank is formed in the other side of the tank body. Both the inlet and the outlet are communicated with the water tank. A ring of sealing groove is formed in the portion, around the opening of the water tank, of the top surface of the tank body, and a sealing ring is arranged in the sealing groove. The cooling device further comprises a cover plate sheet for locking the edge of a substrate laid on the water tank onto the tank body, the cover plate sheet and the top surface of the tank body are detachably connected through a connecting partto clamp the substrate to the position between the tank body and the cover plate sheet, and the substrate covers the sealing groove. A window for exposing the upper surface of the substrate is formedin the cover plate sheet.

Description

technical field [0001] The invention belongs to the field of laser additive remanufacturing, and in particular relates to a substrate cooling device based on the directional solidification characteristic of promoting laser additive remanufacturing. Background technique [0002] The crystal orientation characteristics of alloys have an important influence on the grain size, crack propagation behavior and comprehensive mechanical properties of alloys, especially for alloys used at high temperatures (such as nickel-based superalloys). Since the grain boundary strength of the alloy at high temperature is much lower than the intragranular strength, in order to reduce the weakening effect of the grain boundary, it is often necessary to prepare a large grain or even a single crystal alloy structure, usually through the seed crystal method and the crystal selection method. and directional solidification and other casting techniques. [0003] Laser additive remanufacturing technolog...

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Problems solved by technology

[0005] In order to solve the disadvantage that it is not easy to improve the crystal orientation in the laser additive remanufacturing process of existing superalloys, the present invention discloses a substrate cooling device based on promoting the directional solidification characteristics of laser additive remanufacturing. The cooling device can make the melting The temperature gradient in the vertical direction of the pool increases, which improves the uniformity of heat flow during the solidification process of the molten pool, and obtains dendrites with more uniform crystal orientation and growth direction, thereby easily obtaining high-oriented directionally solidified alloys

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