电磁搅拌时间对半固态A356合金凝固组织的影响

刘政; 许鹤君

doi:10.15980/j.tzzz.2012.09.025

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电磁搅拌时间对半固态A356合金凝固组织的影响
Effect of Electromagnetic Stirring Time on Microstructure of Semisolid A356 Alloy
2012年32卷第9期页码：828-832
纸质出版日期： 2012 ，
DOI： 10.15980/j.tzzz.2012.09.025

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[1]刘政,许鹤君.电磁搅拌时间对半固态A356合金凝固组织的影响[J].特种铸造及有色合金,2012,32(09):828-832.

Liu Zheng1, Xu Hejun2. Effect of Electromagnetic Stirring Time on Microstructure of Semisolid A356 Alloy[J]. Special Casting & Nonferrous Alloys, 2012,32(9):828-832.
[1]刘政,许鹤君.电磁搅拌时间对半固态A356合金凝固组织的影响[J].特种铸造及有色合金,2012,32(09):828-832. DOI： 10.15980/j.tzzz.2012.09.025.

Liu Zheng1, Xu Hejun2. Effect of Electromagnetic Stirring Time on Microstructure of Semisolid A356 Alloy[J]. Special Casting & Nonferrous Alloys, 2012,32(9):828-832. DOI： 10.15980/j.tzzz.2012.09.025.

摘要

应用变频控制的电磁搅拌装置对低过热度浇注的A356合金熔体进行短时弱电磁搅拌

探讨了不同的搅拌时间对合金凝固组织中的初生α-Al相和共晶相形貌与分布规律的影响

从而得到最佳的电磁搅拌工艺参数。研究表明

A356合金熔体在620℃浇注

并经频率为30Hz的电磁搅拌15s

在615℃保温10min后

初生α-Al的平均等积圆直径为55.70μm

平均形状因子达到了0.86

共晶组织颗粒细小、致密且分布均匀

此条件下得到的半固态A356合金浆料的室温凝固组织形貌最好。

Abstract

A356 melt poured by low superheat was slightly electromagnetically stirred for short time with an electromagnetic stirrer which was controlled by frequency conversion.Effects of electromagnetic stirring time on morphology and distribution of primary phase and eutectic phase in microstructure of semisolid A356 alloy were investigated to obtain the optimized electromagnetic stirring processing parameters.The results indicate that the primary α-Al with 55.70 μm in average equal-area circle diameter and 0.86 in average shape factor can be obtained in semisolid A356 alloy with pouring at 620 ℃

stirring for 15 s at 30 Hz

and holding at 615 ℃ for 10 min.Meanwhile

the fine and compact eutectic phases are uniformly distributed in the alloy.The desirable microstructures in semisolid A356 alloy can be observed with optimized processing parameters.