Inhibition of Cusp magnetic field on stray-crystal formation in platform region during directionally solidified single-crystal superalloy
Inhibition of Cusp magnetic field on stray-crystal formation in platform region during directionally solidified single-crystal superalloy
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Cusp磁场对定向凝固单晶高温合金平台区杂晶形成的抑制作用
DOI：
10.1016/j.jmst.2021.06.086
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发表时间：
2021-10
影响因子：
10.9
通讯作者：
Zhong Yunbo
中科院分区：
文献类型：
--
作者：
Ren Weili;Zhou Tao;Yuan Xiaotan;Jian Ming;Zhang Congjiang;Ding Biao;Peng Jianchao;Zheng Tianxiang;Zhong Yunbo
平台区杂晶是单晶高温合金叶片常见的主要缺陷之一。迫切需要探索简单有效的方法来消除这一缺陷。这项工作发现Cusp磁场可以有效抑制平台内杂晶的形成。在一定的提拉速率和温度梯度下，随着磁场强度的增加，杂晶形成的趋势减小。抑制效果随着提取速率或温度梯度的增加而降低。最后，基于实验和数值模拟，提出了Cusp磁场抑制杂晶形成的机理。磁场的施加增强了流速并改变了液固界面附近的流动结构，进一步减小了径向温差。因此，导热过冷区的二次枝晶以更快的速度向角部扩展，从而减少了平台角部杂晶的形成。本研究为减少平台区单晶制备过程中杂晶的形成提供了一种有效且简单的方法。
The stray crystal in the platform region is one of the common main defects in single-crystal superalloy blades. The simple and effective method to eliminate this defect is urgent to be explored. This work found that the Cusp magnetic field can effectively inhibit the stray-crystal formation in the platform. The tendency of stray-crystal formation decreases as the magnetic-field strength increases at a certain withdrawal rate and temperature-gradient. The suppressing effect decreases as the withdrawal rate or the temperature-gradient increases. Finally, the inhibiting mechanism on the stray-crystal formation from the Cusp magnetic field is proposed based on the experiments and the numerical simulation. The magnetic-field application strengthens the flow velocity and changes the flow structure near the liquid-solid interface, and further reduces the radial temperature difference. Accordingly, the secondary dendrites in the heat-conduction undercooled zone expands towards the corner in a faster speed, which reduces the stray-crystal formation in the platform corner. This study provides an effective and simple method for decreasing the stray-crystal formation during the preparation of single-crystal with platform region.
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