Grain refinement of commercial pure Al treated by Pulsed Magneto-Oscillation on the top surface of melt

被引：0

作者：

Dong Liang ^{[1
]}

Zhuyuan Liang ^{[1
]}

Jie Sun ^{[1
]}

Qijie Zhai ^{[1
]}

Wang Gui ^{[2
]}

David HStJohn ^{[2
]}

机构：

[1] Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University

[2] Centre for Advanced Materials Processing and Manufacturing, The University of Queensland

来源：

ChinaFoundry | 2015年 / 12卷 / 01期

关键词：

grain refinement; casting process; nucleation and growth; finite element(FE) simulation; pulsed magneto-oscillation(PMO);

D O I：

暂无

中图分类号：

TG292 [轻金属铸造];

学科分类号：

080201 ; 080503 ;

摘要：

Commercial pure Al can be refined by Pulsed Magneto-Oscillation(PMO) treatment applied via a plate induction coil above the top surface of the melt. The proportion of the equiaxed zone area increases with decreasing Height to Diameter(H/D) ratios from 3.5 to1.8 and further to 1.0. Meanwhile, it increases and then decreases with increasing peak current for the three kinds of ingots with H/D ratios of 3.5, 1.8 and 1.0, respectively. However, when the H/D ratio decreases to 0.44, the area proportion of equiaxed zone can reach the maximum value with a lower peak current. FEA software simulation indicates that smaller H/D ratio results in larger current density, electromagnetic force and convection on the top surface of the melt, favoring nucleation and subsequent grain formation. Through evaluating Joule heating effect by PMO, it was found that the proper amount of Joule heating benefits grain refinement. Excessive Joule heating can reduce the size of the equiaxed zone and change the growth morphology of the grains.

引用

页码：48 / 53

页数：6

共 13 条

[1]

Mechanism of pulse magneto-oscillation grain refinement on pure Al[J]. Pei Ning1,Gong Yongyong1,Li Renxing2,Xia Zanqi2 and Zhai Qijie2(1.College of Science,Shanghai University,Shanghai 200444,China;2.Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing,Shanghai University,Shanghai 200072,China).China Foundry. 2011(01)

[2] 液态Al和Al-RE合金的密度、表面张力及对BN的润湿性和附着功 [J].

边茂恕 ;

陈秋 ;

王景唐 ;

不详 .

金属学报 , 1988, (02) :207-209

[3]

Nucleation and grain formation of pure Al under Pulsed Magneto-Oscillation treatment[J] . Dong Liang,Zhuyuan Liang,Qijie Zhai,Gui Wang,David H. StJohn.Materials Letters . 2014

[4]

Microstructures and thermal stability of the semi-solid 2024 aluminum alloy prepared using the pulsed magnetic field process: Effects of technological parameters[J] . L. Zhang,W. Li,J.P. Yao.Journal of Alloys and Compounds . 2013

[5] Refining of pure aluminum cast structure by surface pulsed magneto-oscillation [J].

Yin, Zhen-Xing ;

Gong, Yong-Yong ;

Li, Bo ;

Cheng, Yu-Feng ;

Liang, Dong ;

Zhai, Qi-Jie .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2012, 212 (12) :2629-2634

[6]

Microstructure and mechanical properties of Mg–Al–Zn alloy under a low-voltage pulsed magnetic field[J] . J.W. Fu,Y.S. Yang.Materials Letters . 2011 (1)

[7]

Effect of pulsed magnetic field on superalloy melt[J] . Xiaoping Ma,Yuansheng Yang,Bin Wang.International Journal of Heat and Mass Transfer . 2009 (23)

[8] Potency of high-intensity ultrasonic treatment for grain refinement of magnesium alloys [J].

Ramirez, A. ;

Qian, Ma ;

Davis, B. ;

Wilks, T. ;

StJohn, D. H. .

SCRIPTA MATERIALIA, 2008, 59 (01) :19-22

[9]

Structure refinement of pure aluminum by pulse magneto-oscillation[J] . Yong-Yong Gong,Jun Luo,Jin-Xian Jing,Zan-Qi Xia,Qi-Jie Zhai.Materials Science ＆ Engineering A . 2008 (1)

[10] Refining mechanism of the electric current pulse on the solidification structure of pure aluminum [J].

Liao, Xiliang ;

Zhai, Qijie ;

Luo, Jun ;

Chen, Wenjie ;

Gong, Yongyong .

ACTA MATERIALIA, 2007, 55 (09) :3103-3109

← 1 2 →