Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Heavy non - ferrous metals and their alloys > Copper

Cutting silicon brass performance study

Author ZhangXingLi
Tutor WangYueChen
School Jiangxi University of Technology
Course Condensed Matter Physics
Keywords Cutting Brass Mechanical Properties Corrosion resistance Cutting performance
CLC TG146.11
Type Master's thesis
Year 2010
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The selection as to the Cu-Zn-Si-P base alloy, by adding an appropriate amount of alloying elements such as aluminum, tin, nickel, lanthanum, developed a new cutting brass, to replace the toxic lead brass and expensive bismuth brass, on this basis to explore the impact of the addition of various alloying elements on the organizational structure and performance of the alloy, and the analysis of the impact mechanism. Experiment (1) melting - squeeze - Cold Drawn prepared alloy samples of different formulations; (2) using optical microscope, X-ray diffractometer, sweep the surface electron microscopy and energy dispersive spectroscopy alloy composition, organizational structure and surface morphology of the test; (3) the use of Brinell hardness tester, cutting tests and tensile testing machine measured the alloy hardness and cutting performance and mechanical properties; (4) and by sea water corrosion and dezincification test the alloy corrosion quantified. The main conclusions are as follows: As the silicon content increases alloy in the Cu-Zn-Si-P-Sn-Ni-La alloy elongated, needle-like or claw-like α-phase gradual reduction, gray and black β phase, white the the dot β 'phase and Cu 9 Si brittle compounds gradually increased, it is relative to the α-phase significantly hard and brittle phase and the compound is increased to a certain extent improve the alloy easy machinability, Cu-Zn-0.5% Si-P-Sn-Ni-La alloy α-, β-phase, the white dotted β phase and brittle compound Cu9Si combination to achieve the best state, has good mechanical properties, cutting performance corrosion resistance. Performance testing of Cu-Zn-0.5% Si-P-Sn-Ni-La alloy cutting performance to about 80% of extruded under the hardness of 140 HB, tensile strength of 602 Mpa, elongation 26.67%; The cold-drawn state where the hardness of 165 HB and a tensile strength of 617 MPa, an elongation of 16%; annealed hardness of 128 HB and a tensile strength of 569 MPa, an elongation of 29%. Seawater corrosion and dezincification performance test results show that the Cu-Zn-0.5% Si-P-Sn-Ni-La alloy extruded artificial seawater corrosion under the average weight loss rate of 0.08 g/m2day, cold-drawn state average weight loss rate of 0.064 g / m 2 day to dezincification thickness cast for 40.7μm, extruded 96.54μm., cold-drawn state of 92.04μm and annealed 63.32μm and were better than the equivalent state HPb59-1 brass. Cu-38.24% Zn-0.5% Si-0.1% P-0.4% Sn-1% Ni-0.06% La alloy having high mechanical properties, machinability and corrosion resistance, and to achieve the desired performance, can replace extensive use HPb59-1 lead brass

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