General Electric Company

Gordon McColvin

Giovanni Cataldi

Jean Laragne

Nickel-iron-cobalt based alloys are disclosed having sufficient castability for centrifugal casting essentially free from casting defects, cracking, and microstructure variability, and coefficients of thermal expansion up to about 9&#xd7;10/&#xb0; C. for about 100-400&#xb0; C. and increasing from about 400-500&#xb0; C. to up to about 10&#xd7;10/&#xb0; C., or up to about 6&#xd7;10/&#xb0; C. between about 100-300&#xb0; C. and increasing from about 300-500&#xb0; C. to up to about 10&#xd7;10/&#xb0; C. Articles are disclosed including unitary cast structures free of internal welds, brazing, and bolting, essentially annular conformations, diameters of at least about 500 mm, cross-sectional wall areas of at least about 2,000 mm, and compositions including nickel-iron-cobalt based alloys. Methods for forming the articles are disclosed including rotating centrifugal molds with the compositions in molten states, forming the articles in near net shape.

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Bolsover, United Kingdom

Gordon McColvin