Hot stretch straightening of high strength age hardened metallic form and straightened age hardened metallic form
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United States of America Patent
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Sep 16, 2014
Grant Date -
Nov 7, 2013
app pub date -
Jul 2, 2013
filing date -
Jul 28, 2010
priority date (Note) -
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Abstract
A method for straightening an age hardened metallic form includes heating an age hardened metallic form comprising one of a titanium alloy, a nickel alloy, an aluminum alloy, and a ferrous alloy to a straightening temperature of at least 25° F. below the age hardening temperature, and applying an elongation tensile stress for a time sufficient to elongate and straighten the form. The elongation tensile stress is at least 20% of the yield stress and not equal to or greater than the yield stress at the straightening temperature. The straightened form deviates from straight by no greater than 0.125 inch over any 5 foot length or shorter length. The straightened form is cooled while simultaneously applying a cooling tensile stress that balances the thermal cooling stress in the metallic form to thereby maintain a deviation from straight of no greater than 0.125 inch over any 5 foot length or shorter length.
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