Metallurgy, Vol. 43 No. 1, 2004.
Preliminary communication
Phenomena of Ductility Minimum of CuZn28 Brass Bars which are Planned for Deep Drawing
M. Oruč
R. Hadžalić
Abstract
Effect of ductility minimum is common properties from most metals and alloys. Research which is presents in this work is in connection with occurrence of ductility minimum during the strain test of brass after rolling and then drawing at room and elevated temperatures. The occurrence of ductility minimum is connected to determined temperature and determined type of fracture which appears exclusive at that temperature. This conditions required to avoid this area for plastic deformation and chapping [1]. The tests of ductility on brass CuZn28 were done because that alloy has the highest ductility in a area comparing to other brasses [2]. Besides this, those tests were done because of problems which involve cold plastically deformation of rolled bars of brass CuZn28 (DIN 17660/84) which are planned for deep drawing. The problems were presented in the beginning of surface and under surface defect in the shape of vertical cracks on rolled and then on past drawn bars which were produced in semi-industrial factories of Metallurgical institute in Zenica.
Keywords
Hrčak ID:
128367
URI
Publication date:
1.1.2004.
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