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Form-Rolling Close Tolerance Shapes of Superalloys.
Final technical rept. Feb 66-Jun 69,
ENGELHARD INDUSTRIES ATTLEBORO MA D E MAKEPEACE
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The program established a process for Form-Rolling net structural shapes, to close tolerance, of superalloys. Materialshape combinations of four alloys Inconel 718, Rene 41, Hastelloy X, and Udimet 700 and three configurations E shape, T shape, and L shape were investigated. Investigations were concerned with establishing suitable starting stock size, tooling and process parameters for preshape configurations, from centerless ground round bars, and for final Form-Rolling operations. The formation of the three ribs of the E- section two outside even ribs and one shorter center rib and the establishment of the unsymmetrical L-section a long thin leg and a shorter thick leg were achieved through a combination of Form Rooling and stationary die swaging. The T-section preform was established through stationary die swaging for a round edge flat bar. The starting stock size, dependent upon tooling design and resulting material flow, was established as the process evolved. E shaped sections of Inco 718 alloy are being fabricated into engine rings which can withstand temperatures above 750F to economically replace extrusions. T shaped sections of Rene 41 and Hastelloy X are being fabricated into lengths for application as strengtheners and joiners in areas where temperatures exceed 800F. L shaped sections of Inconel 718 alloy and Hastelloy X are being fabricated into lengths for applications as joiners and strengtheners to replace extrusions and machined parts. Author
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