旋转磁场对纯铜凝固组织影响研究
毕业论文关键词：旋转磁场；搅拌时间；磁场强度；纯铜
Effect of rotating magnetic field on pure copper solidification structure
Abstract Refinement of the rotating magnetic field on solidification structure of pure copper plays a significant role. Using a rotational magnetic field during solidification of pure copper to obtain uniform fine equiaxed simplifies follow-up process. This experiment used motor stator and voltage rheostat is made by a rotating magnetic field to a rotating magnetic field effect of process parameters on solidification structure of pure copper. Select the process parameters temperature, magnetic field strength and time. Experimental results show that the rotating magnetic field, mainly through intense interaction between liquid metal flow and swirling and stirring to affect the temperature of pure copper and solute distribution during solidification of liquid metal, magnetic forces broke the dendritic crystals, forming more nucleation and organization capable of refined copper. With the rotating magnetic field strength is increased, grain refinement effects of increasing excitation voltage of 180V, grain works best. In pouring temperature and mixing time must of situation Xia, rotating magnetic field of Reed magnetic voltage of increases, on pure copper organization Center, axis crystal of refinement role has significantly of enhanced, pure copper organization hardness has significantly of improve, but rotating magnetic field of Reed magnetic voltage had Assembly produced Eddy, led small particles gathered in with, to will gathered merged growth into big of grain, so grain became coarse; in rotating magnetic field strength and pouring temperature must of situation Xia, pure copper melt liquid in magnetic field in the mixing of time more long, pure copper organization more uniform, The finer grain size and hardness, optimum mixing time was 17 seconds.
Key words: rotating magnetic field; mixing time;magnetic field strength;pure copper
目录
1.前言.1
1.1旋转磁场简介.1
1.2旋转磁场的基本原理.1
1.3旋转磁场的产生.1
1.4旋转磁场对金属凝固组织的影响.1
1.4.1旋转磁场对Al-Cu合金凝固组织的影响1
1.4.2旋转磁场对Sn-Bi合金凝固组织的影响.2
1.4.3旋转磁场对Pb-Sn合金凝固组织的影响.2
1.5高速铁路接触线的研究进展.2
1.5.1接触线的种类及性能特点2
1.5.2接触线的生产工艺3
1.5.3接触线的发展方向3
1.6选题的目的和意义.4
1.7课题研究的内容和目标.4
1.7.1研究内容.4
1.7.2研究目标.4
2.实验.5
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