电磁铸造搅拌频率对汽车用A356铝合金组织和性能的影响  

Effect of Stirring Frequency of Electromagnetic Casting on Microstructure and Properties of A356 Aluminum Alloy for Automobile

作　　者：索小娟[1] 丰会萍 SUO Xiaojuan;FENG Huiping(College of Electrical and Mechanical Engineering,Zhengzhou Railway Vocatial&Technical College,Zhengzhou 451460,China;Department of Mechanical and Electrical Technology,Xijing University,Xian 710123,China)

机构地区：[1]郑州铁路职业技术学院机电工程学院,河南郑州451460 [2]西京学院机电技术系,陕西西安710123

出　　处：《热加工工艺》2020年第13期85-88,共4页Hot Working Technology

摘　　要：进行了汽车用A356铝合金的电磁铸造试验,研究了不同电磁搅拌频率对A356铝合金试样晶粒大小和形状的影响。采用Image-ProPlus软件对试样进行了晶粒当量直径和形状因子的测量,分析了不同频率下不同试样中α-Al晶粒的平均当量直径和平均形状因子。采用室温拉伸试验对不同电磁搅拌频率下制备的试样拉伸性能进行了研究,重点分析了试样的抗拉强度和伸长率随电磁搅拌频率的变化规律,并对拉伸断口的形貌特征和断裂机理进行了分析。结果表明,电磁搅拌对试样的晶粒有明显的细化作用,对晶粒的形状有一定改善作用;随电磁搅拌频率的增加晶粒的尺寸大小呈现出先降低后增加的趋势,试样的抗拉强度明显提高,但是伸长率变化不明显。The electromagnetic casting test of A356 aluminum alloy for automobile was carried out. The effect of different electromagnetic stirring frequencies on grain size and shape of A356 aluminum alloy sample was studied. The equivalent diameter and shape factor of the sample were measured by using Image-ProPlus software, and the average equivalent diameter and shape factor of α-Al grains in different samples were analyzed under different frequencies. The tensile properties of samples prepared at different electromagnetic stirring frequencies were studied by tensile test at room temperature. The variation of tensile strength and elongation with electromagnetic stirring frequency was analyzed emphatically. The morphology characteristics and fracture mechanism of tensile fracture were analyzed. The results show that electromagnetic stirring can refine the grain and improve the grain shape to a certain extent. The grain size decreases first and then increases with the increase of electromagnetic stirring frequency. With the increase of electromagnetic stirring frequency,the tensile strength of the sample increases obviously, but the elongation changes little.

关 键 词：电磁铸造 A356铝合金 电磁搅拌频率 组织 力学性能 

分 类 号：TG249.9[金属学及工艺—铸造]