Method and device for testing interfacial heat transfer coefficient during rapid solidification

Abstract

The invention discloses a method for testing an interfacial heat transfer coefficient during rapid solidification. The interfacial heat transfer coefficient is obtained by immersing a heat flow measurement probe in a melting furnace and transmitting the measured data to a signal data acquisition system and a computer, wherein the measurement probe comprises two symmetrically designed copper plates (sheets) with the same size; two thermocouples with equal diameter are welded to the inner sides of the two copper plates; the two copper plates are closely fixed with screws to ensure that the gap between the two is less than 0.5mm; and the two thermocouples measure the temperature of two points on the inner walls of the copper plates. In the method and the device, because the size of the copper plate in one direction is far less than the sizes in another two directions, the heat transfer can be considered as one-dimensional heat transfer. The temperature of the inner wall of the copper plate is measured by the thermocouple and then the heat flow of the interface is calculated. And the interfacial heat transfer coefficient between a base and molten steel is further calculated through the interfacial heat flow.

Description

technical field [0001] The invention belongs to the technical field of metal solidification, in particular to a test method and device for interface heat transfer coefficient in a rapid solidification process. Background technique [0002] The development direction of continuous casting technology is towards high casting speed and near net shape. Among them, the thin strip continuous casting process is a typical representative of near-net shape continuous casting. With the thinning of the slab thickness and the increase of the casting speed, the metal solidifies in a very short time, and the solidification heat transfer rate of the slab is greatly improved. The core that affects heat transfer and solidification is the interface heat transfer between the molten steel and the solidified shell and the metal substrate. The heat transfer conditions directly affect the formulation of process parameters and the final microstructure and properties of the material. [0003] The rap...

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Problems solved by technology

[0008] 1. Interfering with the temperature field distribution inside the mold

[0009] 2. It is difficult to ensure the exact position of the thermocouple installation

[0010] 3. The contact between the thermocouple and the mold is uncertain

[0011] The above shortcomings will inevitably introduce errors in the subsequent measurement process, and even cause the measurement results to be inconsistent with the actual physical process.

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