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Experimental Study on Electric Pulse Processing of Metal Materials

Author: LvDuanJian
Tutor: SunHongZuo
School: Harbin University of Science and Technology
Course: Materials Processing Engineering
Keywords: Electrical pulse Plastic Tungsten alloy Fractography Recrystallization
CLC: TG111.4
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


Pulse current material handling technology is an intricate cross-disciplinary, and subject to the limitations of the existing conditions of the experiment, the research methods and researchers mindset. Although in recent years some scholars pulse current in the metal solidification process in-depth discussion and research. But been little research in solid metal alloy microstructure and properties. And nowadays the material of the electric pulse processing technology yet industrial applications, mainly due pulse impact on the metal material handling mechanism of action is not clear. Impact of its refinement mechanism of alloy, solid-state pure metal grain orientation, composition and impurity distribution, as well as pulse processing degree of influence on the mechanical properties of the solid metal, etc. related issues yet to be resolved. In addition, the domestic and foreign scholars in order to improve the strength and toughness of high density tungsten alloy, researchers alloying, deformation strengthening, adiabatic shear, numerical simulation, and its preparation process has done a lot of work. But still not a good enhancement technology to enable them to meet the mechanical performance requirements of the rod penetrators bomb core material (tungsten alloy). Metal heat treatment by thermal effects as the means of achieving efficiency and low energy consumption, serious pollution of the environment as well as the sample surface oxidation annealing. These shortcomings to overcome the traditional annealing process, this project will explore in depth the electrical pulse processing technology of this new annealing process. And tried on the basis of solid pure copper and iron-carbon alloy, the in-depth study of the high-density electrical pulse processing heavy alloy instead of the traditional thermal effects of annealing of the new method. Improved pulse power supply regulation homemade current, frequency, pulse width, and duration of action. And design and the pulse of solid metal materials processing experiments. Pure copper, iron-carbon alloys and tungsten alloy line pulse current handling of the different experimental parameters and theoretical analysis. The experiments show that, when the current is 401A, the frequency of 100Hz, pulse current processing time 5min, pure copper sample recrystallization phenomenon, the temperature range of 200 ~ 500 ℃. Samples for the iron-carbon alloy, a high-frequency pulse current is processed in the 330 to 520 ° C to cause recrystallization, visible its significantly reduced in the recrystallization starting temperature, and increase the nucleation rate of recrystallization, and after the treatment the tensile The strength is significantly decreased. For tungsten alloy materials for the pulse processing their plasticity increases certain role in promoting change with the different duration of action, and the frequency increases the tensile strength increase. Its frequency, the current size and the role of time affect tissue components.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Physics of metals > The liquid structure of the metal and solidification theory
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