Effect Of Sn On Microstructure And Properties Of H65 Brass

The improved performance of alloy organization gradually meet the requirements of multi-practical alloy products with the increasingly deepening of the study on brass. The study showed that the adding of trace alloy elements could improve the performance of organization and got some new features. In order to solving the problem of strongly demanding to elastic. This experiment synthetic the tin brass through adding trace Sn elements to H65 brass can partly replace tin phosphor bronze in the elastic material such as electronic components and relay, which didn’t need special heat treatment. The experiment is to make full use of environmentally alloy element which have environmental protection, good performance and energy saving characteristics. That can reduce the consumption of tin which is belong to scarce resource, which accord with modern high-tech materials research direction and promote China’s copper base technology progress in the field of new materials.This experiment aims to study the effects of adding different content of Sn to H65 brass and changing the heat treatment conditions on the H65 brass alloy on the microstructure and property. And then analysis materials’ microstructure and property after the ingot casting, cold rolling and heat treatment, which can determine the best level of trace elements and the most reasonable production technology conditions. The results of the study are as follows:As the Sn elements increasing, the beta phase group, tensile strength and hard ness of the alloy are increased, however, the grain size, extension of the finished product rate and electrical conductivity are decreased After pouring, the as-cast alloy composition is uneven, Sn elements are mainly distributed in the grain boundary, through deformation heat treatment can improve the distribution uniformity of Sn elements. Experimental show that cold rough rolling and intermediate rolling plate reached 75%, and the precision rolling processing reached 70%. The organization is fibrous after distorting, which producing strain hardening. After precision rolling the best comprehensive properties is adding 1% Sn to H65, the tensile strength,entanglement and electrical conductivity reached 750 MPa, 2.8 and 19.3% IACS. The distorting strip sintered at 600℃ for 2h can fully recover plastic, and the annealing process of finishing products are sintered at 280℃ for 1h. Through the comprehensive analysis, the best Sn content is 1%, whoses tensile strength, entanglement,electrical conductivity, vickers hardness and elastic modulus under the semi-hard state are respectively as 495 MPa, 31%, 25.2% IACS, 210.6 and 103 GPa. There is no ear appears and the bend performance is very good when it dept drawing.