Structure and Deformation Characteristics of Rheocast Metals

During the past two years a number of Thixoforging systems (reheat furnaces with pentrometers and heated dies adapted to existing hydraulic presses) were designed, constructed and operated. These include: Two laboratory apparatuses with 50-ton hydraulic presses and a pilot plant size system with a 2...

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Bibliographic Details
Main Authors: Mehrabian,R, Sekhar,J A, Chen,C Y, Abbaschian,G J, Backman,D G
Format: Report
Language:English
Subjects:
Aluminum alloy 2024
ALUMINUM ALLOYS
ASH84
CASTING
Cobalt alloy Haynes 31
COBALT ALLOYS
DIES
Fabrication Metallurgy
FORGING
FURNACES
GEOMETRIC FORMS
HYDRAULIC PRESSES
INDUSTRIAL PRODUCTION
LABORATORY EQUIPMENT
Metallurgy and Metallography
PE62105A
PILOT PLANTS
Rheocasting
RHEOLOGY
SHAPE
STEEL
Steel 4340
Thixoforging
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Summary:During the past two years a number of Thixoforging systems (reheat furnaces with pentrometers and heated dies adapted to existing hydraulic presses) were designed, constructed and operated. These include: Two laboratory apparatuses with 50-ton hydraulic presses and a pilot plant size system with a 200-ton forging press. The continuous Rheocasting apparatus was modified and located near the large press to permit direct transfer of partially solid charge material to the dies without going through a solidification and reheating cycle. Experiments on the high temperature slurry producer showed that primary solid particle size in Rheocast cobalt-base Haynes alloy 31 and 4340 low alloy steel are of the same size as primary dendrite arm spacings in conventional specimens solidified under identical cooling rats. A theoretical model previously developed for homogenization (solution) heat treatment of Rheocast structures was used in the heat treatment of 2024 aluminum alloy forged specimens. The specific phases in this alloy before and after homogenization heat treatment were identified using an Electron Microprobe.