Metal treatment – Process of modifying or maintaining internal physical... – Utilizing disclosed mathematical formula or relationship
Reexamination Certificate
2005-02-22
2005-02-22
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Utilizing disclosed mathematical formula or relationship
C148S698000, C702S130000, C702S156000
Reexamination Certificate
active
06858103
ABSTRACT:
The present invention discloses a method for optimizing heat treatment of precipitation-hardened alloys having at least one precipitate phase by decreasing aging time and/or aging temperature using thermal growth predictions based on a quantitative model. The method includes predicting three values: a volume change in the precipitation-hardened alloy due to transformations in at least one precipitation phase, an equilibrium phase fraction of at least one precipitation phase, and a kinetic growth coefficient of at least one precipitation phase. Based on these three values and a thermal growth model, the method predicts thermal growth in a precipitation-hardened alloy. The thermal growth model is particularly suitable for Al—Si—Cu alloys used in aluminum alloy components. The present invention also discloses a method to predict heat treatment aging time and temperature necessary for dimensional stability without the need for inexact and costly trial and error measurements.
REFERENCES:
patent: 4336076 (1982-06-01), Edamura et al.
patent: 6269321 (2001-07-01), Palle et al.
“Densities of Wrought Aluminum Alloys”, by D.E. Kunkle et al, Journal of Materials, pp. 226-240, undated.
“Dimensional Changes in Heat Treating Aluminum Alloys”, by H.Y. Hunsicker, Metallurgical Transactions A, vol. 11A, May 1980, pp. 759-773.
Allison John Edmond
Wolverton Christopher Mark
Brooks & Kushman P.C.
Combs Morillo Janelle
Ford Global Technologies LLC
Porcari Damian
Wyszomierski George
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