Pre-molten slag for smelting electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof

Abstract

The invention discloses a pre-molten slag for smelting an electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof. The pre-molten slag comprises, by weight, 50%-60% of CaF2, 15%-25% of Al2O3, 15%-25% of CaO, 1%-5% of MgO, 0.5%-5% of TiO2, 0.5%-5% of ZrO2 and the balance impurities. The pre-molten slag is applied to high-temperature alloy ingot smelting by adopting an electroslag remelting continuous directional solidification technology. An application method comprises the following steps that the pre-molten slag is baked; the pre-moltenslag is fully molten through a slag melting furnace; and the molten pre-molten slag is transferred into a crystallizer of an electroslag remelting continuous directional solidification device, consumable electrodes are inserted into the crystallizer for smelting, and the high-temperature alloy ingot is obtained. According to the pre-molten slag for smelting the electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof, the pre-molten slag can effectively control active element burning losses, ensure the chemical component uniformity and especially inhibit the burning losses of titanium and zirconium and can ensure electroslag remelting continuous conducting, the pre-molten slag is applied to smelting of the high-temperature alloy ingot, the ingot obtained by adopting the method is uniform in axial component, and the surface quality of the ingot is improved.

Description

technical field [0001] The invention relates to the technical field of superalloy smelting, more specifically, it relates to a pre-melted slag for electroslag remelting continuous directional solidification superalloy ingot smelting and its application. Background technique [0002] Nickel-based wrought superalloys usually have a maximum service temperature range of 650°C-800°C. Due to their excellent comprehensive mechanical properties, they are used as hot end parts of aviation and aerospace engines. In order to adapt to the improvement of engine performance, superalloy materials are constantly adding more types of alloying elements to improve the temperature bearing capacity, so the preparation process of the material is more difficult, in which the chemical composition and element segregation structure of the superalloy ingot smelting process The control of superalloys is crucial to the preparation and properties of superalloy materials. [0003] In the prior art, elect...

AI Technical Summary

Problems solved by technology

Elements such as Ti, Al, and Zr are relatively active, and are easily oxidized and burned during the smelting process, resulting in uneven axial composition of the ingot, and precise control cannot be achieved during the electroslag process. Constant changes in the reaction temperature of stable oxides, metals and slag lead to more changes in the content of elements in electroslag ingots

The continuous directional solidification of electroslag remelting is an ingot-drawing electroslag furnace. The ingot is melted, solidified and drawn out at the same time. This requires the smelting pre-melted slag to have certain high-temperature plasticity, high-temperature strength, appropriate viscosity, and fluidity. and a certain lubricating effect, and the melting point of the slag system can match the entire electroslag smelting process of the alloy, but the existing conventional remelting slag system cannot meet the smelting requirements of continuous directional solidification of electroslag remelting

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