Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
2008-01-08
2008-01-08
Cozart, Jermie E. (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S527100, C029S527300, C029S526400, C029S526300, C029S526500, C428S577000, C428S542800, C075S010240, C075S010250
Reexamination Certificate
active
10961626
ABSTRACT:
A method (20) of fabricating a large component such as a gas turbine or compressor disk (32) from segregation-prone materials such as Alloy 706 or Alloy 718 when the size of the ingot required is larger than the size that can be predictably formed without segregations using known triple melt processes. A sound inner core ingot (12) is formed (22) to a first diameter (D1), such as by using a triple melt process including vacuum induction melting (VIM), electroslag remelting (ESR), and vacuum arc remelting (VAR). Material is than added (26) to the outer surface (16) of the core ingot to increase its size to a dimension (D2) required for the forging operation (28). A powder metallurgy or spray deposition process may be used to apply the added material. The added material may have properties that are different than those of the core ingot and may be of graded composition across its depth. This process overcomes ingot size limitations for segregation-prone materials.
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Cozart Jermie E.
Siemens Power Generation, Inc.
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