Slag system for electroslag remelting of high-temperature alloy and use method of slag system

Abstract

The invention provides a slag system for electroslag remelting of a high-temperature alloy. The slag system comprises the following chemical components, by weight percent, 47-53% of CaF2, 20-25% of Al2O3, 17-22% of CaO, 4-6% of MgO, 1-3% of TiO2, 1-4% of HfO2, and the balance FeO, C and impurities. With the adoption of the mode, by adding 1-4% of HfO2, the burning loss of a hafnium element is inhibited, and the component deviation of the hafnium element at the head and tail of an electroslag steel ingot is prevented; by using the slag system for remelting the high-temperature alloy, recovery rates of Al, Ti, Hf and the like are high, and reach 92-98%; a high-temperature alloy steel ingot molten by using the slag system is good in quality, and has no slag runner defect; and the melting velocity of a remelting process is stable, the degree of segregation of the hafnium element is reduced, and the yield of hafnium is raised.

Description

technical field [0001] The invention relates to the field of electroslag remelting, and more specifically relates to a slag system for electroslag remelting of high-temperature alloys and a method for using the same. Background technique [0002] At present, in advanced aero-engines, powdered superalloys have become the preferred material for manufacturing turbine disks, key hot-end components of aero-engines with high thrust-to-weight ratio and low fuel consumption, due to their superior properties at high temperatures. As a special trace element, Hf can enter the γ’ phase and MC carbide, change the distribution of alloying elements Ti, Cr, W, and Mo in the alloy phase, and promote the high temperature stability of γ’. Therefore, in the development of the composition optimization design of the third-generation powder superalloys in European and American countries, with the continuous improvement of the degree of alloying, the addition of Hf is used as an important alloying ...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a slag system for high-temperature alloy electroslag remelting and its use method to solve the problem of hafnium element segregation in the process of electroslag remelting of a high-temperature alloy containing hafnium, reduce the degree of segregation, and increase the yield of hafnium