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Quaternary Fluxes for Electroslag Remelting Ferrous Alloys and Superalloys.
U S Pat 3 950 163 1976 Apr; :
A quaternary flux composition for electroslag consumable-electrode remelting of superalloy and iron-base alloys consists of caf2 40, al2o3 20, cao 36, and mgo 4 pct. The flux has a liquidus temperature of 1,171 deg +/- 3 deg c, which is attributed to a quaternary eutectic composition with mgo.Al2o3, 11cao.7Al2o3.Caf2, caf2, and mgo solid phases in equilibrium with liquid. The reduction of al2o3 content from high values previously used lowers the flux liquidus temperature so that there is a greater liquid temperature difference between the flux and metal to be melted. This enables the flux to be completely molten before the alloy, such as co-base superalloys mar-m509, mar-m302, and s45, begins to melt. A lower al2o3 content also reduces the flux viscosity, which enhances gas removal during melting, lowers the specific electrical resistivity for more economical melting operations, reduced the chances for excess undesirable globular oxide inclusions of al2o3 to appear in the ingot metal, and provides sounder superalloy ingots.
U.S. Pat. 3,950,163; Apr. 13, 1976; Chem. Abstr. 85:82,165Z
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