半连铸工艺对AZ31铸锭组织及力学性能的影响

李金柱; 郑开宏; 农登; 赵明纯; 王震东

doi:10.15980/j.tzzz.2013.09.019

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半连铸工艺对AZ31铸锭组织及力学性能的影响
Effects of Semi-Continuous Casting Parameters on Microstructures and Mechanical Properties of AZ31 Alloy Ingot
2013年33卷第9期页码：837-841
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.09.019

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[1]李金柱,郑开宏,农登,赵明纯,王震东.半连铸工艺对AZ31铸锭组织及力学性能的影响[J].特种铸造及有色合金,2013,33(09):837-841.

Effects of Semi-Continuous Casting Parameters on Microstructures and Mechanical Properties of AZ31 Alloy Ingot[J]. Special Casting & Nonferrous Alloys, 2013,33(9):837-841.
[1]李金柱,郑开宏,农登,赵明纯,王震东.半连铸工艺对AZ31铸锭组织及力学性能的影响[J].特种铸造及有色合金,2013,33(09):837-841. DOI： 10.15980/j.tzzz.2013.09.019.

Effects of Semi-Continuous Casting Parameters on Microstructures and Mechanical Properties of AZ31 Alloy Ingot[J]. Special Casting & Nonferrous Alloys, 2013,33(9):837-841. DOI： 10.15980/j.tzzz.2013.09.019.

摘要

通过优化镁合金半连续铸造技术制备了AZ31镁合金铸锭。优化的半连铸铸造工艺参数:铸造温度为680℃、拉坯速度为95mm/min

冷却水流量为3 500L/min。采用ICP测试仪、光学显微镜和扫描电镜测量了AZ31镁合金铸锭不同位置的成分和组织。结果表明

各个元素分布较均匀;平均晶粒尺寸从边缘到心部有所增大。EDS和线扫描表明共晶体组织主要由Mg17Al12和少量Mg17（AlZn）12相组成。室温拉伸表明

铸锭轴向强度和伸长率从心部到边部呈增加趋势;半径方向强度和伸长率均比轴向高。细晶强化是半连续铸造AZ31镁合金铸锭的主要强化方式。

Abstract

The AZ31 alloy ingot with diameter of 110mm and length of 3 500mm was fabricated successfully by the optimized semi-continuous method with pouring temperature of 680℃

casting speed of 95mm/min and cooling water of 3 500L/min.The composition and microstructure of the alloy ingot prepared at different locations were investigated by ICP analyzer

OM（optical microscope）and SEM（scanning electron microscope）.The results reveal that the chemical composition is distributed homogeneously in the whole alloy ingot.The average grain size is increased from the surface to the center.The EDS and element line-scanning results indicate that the eutectic compounds are mainly composed of β-Mg17Al12 and a small amount of β-Mg17（AlZn）12.In addition

the tensile tests were carried out at ambient temperature to understand the mechanical properties of the alloy ingot.The results indicate that slight improvements of the strength and ductility can be observed from the center to the surface along the axial direction of the alloy ingot

and both the strength and elongation of the samples along the radial direction are higher than those along the axial direction.The fine grain strengthening is the main contributors to the strength of the as-casted AZ31 alloy.