日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 6 (1968),
pp. 549-554

Drawability of α-Brass Sheets

Isao Gokyu1, Keijiro Suzuki1 and Teiji Gotô2

1Department of Metallurgy, Faculty of Engineering, University of Tokyo, Tokyo
2Toyosaki Shindo Co., Ltd., Osaka

Abstract:

Deep drawing of 70/30 and 65/35 brass has been studied by many researchers. But most of these studies have dealt with the ear formation in drawn cups and no attempts have been made to analyse the drawability in terms of the preferred orientation. In brass sheets it is well known that their low-temperature annealing texture is oriented in (225)[734] and their high-temperature one in (110)[112]. It has been reported that the (225)[734] orientation makes little contribution to the drawability in nickel silver sheets and (110)[112] improves the drawability. Also, the grain size has a considerable effect on the drawability.
In the present study the contribution of the crystallographic texture of α-brass toward the deep drawability was investigated, with the results summarized as follows:
(1) There is no marked difference in plastic behavior between 70/30 and 65/35 brasses in regard to the drawability.
(2) Annealing at low temperature (400°C) produces only a (225)[734] texture in the sheets cold rolled above 90%, while slight preferrence in (110)[112] developes in the sheets cold rolled below 90%.
(3) Annealing at high temperature (700°C) tends to produce a (110)[112] texture, but cold-rolling more than 95% before annealing reduces the component remarkably.
(4) Grain coarsening of α-brass is accompanied by the development of (110)[112] texture.
(5) (110)[112] orientation improves the drawability of α-brass.
(6) (225)[734] component makes little contribution to the drawability.
(7) Some correlations were recognized between the drawability and the grain size in α-brass, coarse grained sheets being favorable.


(Received 1967/12/16)

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