Inclusion decanting process for nickel-based superalloys and oth

Details Inclusion decanting process for nickel-based superalloys and oth Inclusion decanting process for nickel-based superalloys and oth

1991-09-04

1992-04-07

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75628, 75960, C22B 400

Patent

active

051024497

ABSTRACT:
In a method of remelting metallic materials, particularly nickel-based superalloys, in which the melting operation is carried out in a cooled copper crucible under clean vacuum conditions by means of electromagnetic inductors, the magnetic field applied to the mass of molten metal has a frequency between 50 Hz and 5.times.10.sup.6 Hz, preferably between 5.times.10.sup.3 Hz and 5.times.10.sup.5 Hz, so as to effect simultaneously electromagnetic stirring of the liquid metal and a surface concentration at the cold walls of the mass to be recast of all the non-conductive particles, especially ceramic inclusions, thereby achieving an inclusion decanting.

REFERENCES:
patent: 4786320 (1988-11-01), Hobson et al.
patent: 4863509 (1989-09-01), Metz

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