Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1985-10-09
1987-05-05
Andrews, Melvyn J.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148127, 148159, C21D 162
Patent
active
046629556
ABSTRACT:
A method is disclosed for treating graphite reinforced metal matrix composites so as to eliminate thermal strain hysteresis and impart dimensional stability through a large thermal cycle. The method is applied to the composite post fabrication and is effective on metal matrix materials using graphite fibers manufactured by both the hot roll bonding and diffusion bonding techniques.
The method consists of first heat treating the material in a solution anneal oven followed by a water quench and then subjecting the material to a cryogenic treatment in a cryogenic oven. This heat treatment and cryogenic stress reflief is effective in imparting a dimensional stability and reduced thermal strain hysteresis in the material over a -250.degree. F. to +250.degree. F. thermal cycle.
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Metals Handbook, vol. 4, ninth edition, p. 680, 11/81.
Dries Gregory A.
Tompkins Stephen S.
Andrews Melvyn J.
Helfrich George F.
Kastler S.
Manning John R.
The United States of America as represented by the Administrator
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