Experimental and numerical analysis of hot tearing susceptibility for Mg–Y alloys
Experimental and numerical analysis of hot tearing susceptibility for Mg–Y alloys
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DOI：
10.1007/s10853-013-7712-z
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发表时间：
2013
影响因子：
4.5
通讯作者：
Zhi Wang;Yuanding Huang;A. Srinivasan;Zheng Liu;F. Beckmann;K. Kainer;N. Hort
中科院分区：
文献类型：
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作者：
Zhi Wang;Yuanding Huang;A. Srinivasan;Zheng Liu;F. Beckmann;K. Kainer;N. Hort
采用配有称重传感器和数据采集系统的约束杆铸造（CRC）装置，研究了Y含量和初始铸型温度对二元Mg-Y合金热裂敏感性（HTS）的影响。在CRC实验期间监测热裂纹形成。实验结果表明，高温超导随Y含量的增加先增加，在Y含量约为1.5wt%时达到最大值，然后随Y含量的进一步增加而降低。Mg-1.5wt % Y合金的热裂最严重，这是由于Mg-1.5wt % Y合金具有大的柱状晶组织、宽的凝固范围和少量的共晶组织。提高模具初始温度可明显提高制品的抗热裂性能。采用ProCAST模拟软件对Mg-Y合金在连铸连轧过程中的热裂进行了预测。仿真结果与实验测量结果吻合较好。数值模拟结果对优化合金成分和铸造工艺参数以减少热裂缺陷的产生具有一定的参考价值。
The influences of Y content and initial mold temperatures on the hot tearing susceptibility (HTS) of binary Mg–Y alloys were investigated using a constrained rod casting (CRC) apparatus, which is equipped with a load cell and data acquisition systems. The hot crack formation was monitored during CRC experiments. The experimental results show that HTS first increases with increase in the Y content, reaches the maximum at about 1.5 wt% Y and then decreases with further increase in the content of Y. The severest of hot tearing is found in Mg–1.5 wt% Y alloy which is due to its large columnar grain structure, wide solidification range, and small amount of eutectic. The resistance to hot tearing is apparently improved by increasing the initial mold temperature. ProCAST simulation software was used to predict the hot tearing of Mg–Y alloys in CRC. The simulation results show a good agreement with the experimental measurements. The numerical simulations will be helpful and valuable to optimize the alloy composition and casting parameters to minimize the hot tearing defects.