Brass material and a process for the preparation thereof
AssigneeDiehl GmbH & Co.
InventorPeter Ruchel
Life of this patent
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Abstract
A brass material and a process for the preparation thereof, which comprises an alloy of 61 to 65% by weight of copper with the remainder being zinc; the material evidencing a structure in which the recrystallized phases .alpha. and .beta..sub.1 are present in a discrete fine mixture having grain sizes of less than 5 .mu.m. The component of the .beta..sub.1 phase comprises at least 10% of the structure and is arranged in the form of discrete particles in the grain boundaries of the .alpha. phase.
Claims9
In a process for the preparation of a brass material from a semi-finished material constituted of a copper-zinc alloy of about 61 to 65% by weight of copper with the remainder being zinc, said semi-finished material is cold worked and subsequently subjected to a temperature- and time-measured heat treatment utilized for malleable alloys;
- the improvement comprising initial formation of the .alpha. solid solution only by annealing said alloy at temperatures of 450.degree. to 700.degree. C. and for an annealing period of about 20 hours at 450.degree. C. and for about 15 minutes at 700.degree. C. to totally dissolve all of the .beta. phase;
- thereafter cold working said alloy to a degree of deformation of at least 50%;
- and subsequently subjecting said alloy to a heat treatment leading to a .beta..sub.1 phase precipitation and recrystallization at temperatures of between 200.degree. and 350.degree. C., and an annealing period of between 1 minute and 500 hours.
Dependencies are inferred from the claim text.