Purification treatment method of cast superalloy return scraps and superalloy

Abstract

The embodiment of the invention provides a purification treatment method of cast superalloy return scraps and a superalloy and relates to the field of return scrap purification and remelting. The purification treatment method of the cast superalloy return scraps mainly comprises the steps of mixing the treated return scraps with a new material, conducting high-temperature refining; adding coveringslag on the surface of molten steel to conduct deslagging treatment in the high-temperature refining process, wherein the covering slag comprises CaO-Al2O3-CaF2-MgO, and the weight ratio of CaO to Al2O3 to CaF2 to MgO is 4-6:2-3:1-3:0-1; and conducting vacuum horizontal continuous casting and billet discharge on the molten steel subjected to deslagging treatment to obtain a purified master alloycast rod. The purification treatment method of the cast superalloy return scraps, provided by the embodiment of the invention is simple in process, low in cost and high in purification effect.

Description

technical field [0001] The present application relates to the field of purification and remelting of returned materials, and in particular, relates to a method for purifying and treating returned materials of cast superalloys and superalloys. Background technique [0002] At present, due to the denudation of the crucible and shell surface aggregates in the casting process of superalloys, the online pollution caused by the reaction of core and shell materials with molten steel, as well as the high temperature oxidation and sand sticking on the surface of castings, riser shrinkage cavities The surface adsorption of gas and dust leads to an increase in the content of inclusions and harmful gases in the cast superalloy return material, which seriously affects the toughness and fatigue life of the alloy, and brings great risks to the reliable service of the alloy. Taking K417, a widely used main cast superalloy, as an example, the content of inclusions larger than 50 µm in every ...

AI Technical Summary

Problems solved by technology

However, the obvious problem of this technology in practical application is that the filter mesh is easily clogged with the increase of molten steel, and in the continuous filtering process, the subsequent molten steel will impact the adsorbed inclusions and regenerate them. into the molten steel, therefore, the ceramic filter technology cannot well meet the purification treatment requirements of the cast superalloy return material

In addition, new technologies developed in recent years in purification smelting include: double / triple smelting process, EBCHR electron beam cooling furnace technology, CaO / Y 2 o 3 The new crucible smelting technology, etc., all have the problems of complex operation process and high preparation cost, and cannot be applied to the industrial production of the purification treatment of cast superalloy return materials

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