Metal treatment – Compositions – Heat treating
Patent
1989-02-16
1990-06-05
Roy, Upendra
Metal treatment
Compositions
Heat treating
148 115C, 148 206, 420494, C22F 108
Patent
active
049311050
ABSTRACT:
This invention provides a method for production of reproducible heat treated parts with improved mechanical properties. More specifically, the invention provides a process which comprises the steps of preparing, for example, a copper beryllium alloy melt, casting the alloy melt by a continuous process which uses rapid solidification process techniques or hot working a cast alloy and solution annealing the hot worked alloy, passing the alloy through one or more cold-working steps, applying mechanical and thermal treatments to decrease the residual lattice strains created by cold working the alloy, and then subjecting the alloy to a heat treatment, at temperatures ranging between 250.degree. F. and 800.degree. F., in a heat treating media that gives a rate of heat flow from the interface into the alloy that is fast enough to create those (.alpha.) precipitation mechanisms that result in increases in elongations and decreases in proportional limits, thereby attaining and maintaining the heat treating temperature before appreciable precipitation hardening takes place after quenching.
From these primary products, formed parts can be age hardened in a reproducible manner in those heat transfer media which create minimal distortion and improved mechanical properties over a broad range of temperatures. The process also provides for a more even patterned distribution of precipitates in the matrix of the alloy, both prior to and after a thermal aging process. The implementation of this process results in an alloy which exhibits an increased elongation in tandem with an increased yield stress.
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Beryllium Copper Processes L.P.
Roy Upendra
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