Comparative study on structural transformation of low-melting pure Al and high-melting stainless steel under external pulsed magnetic field
Comparative study on structural transformation of low-melting pure Al and high-melting stainless steel under external pulsed magnetic field
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DOI：
10.1016/j.matlet.2007.01.007
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发表时间：
2007-07
影响因子：
3
通讯作者：
Yulai Gao;Qiu-shu Li;Y. Gong;Q. Zhai
中科院分区：
文献类型：
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作者：
Yulai Gao;Qiu-shu Li;Y. Gong;Q. Zhai
对低熔点纯铝和高熔点1Cr18Ni9Ti不锈钢在外加脉冲磁场作用下的组织转变进行了对比研究。结果表明，纯铝在磁场作用下可获得完全等轴晶，而不锈钢在磁场作用下仅能获得细小的柱状晶。认为结晶器壁产生的异质形核及其在磁场作用下的振荡脱落是晶粒细化的主要原因。相反，由于高温熔体与结晶器之间存在较大的温度梯度，在不锈钢的初始凝固阶段产生了致密的激冷层，从而防止了落核。因此，可能仅发生枝晶细化。
A comparative study on the structural transformation of low-melting pure Al and high-melting 1Cr18Ni9Ti stainless steel under external pulsed magnetic field was carried out. The results showed that totally equiaxed grains were produced for pure Al, however, only thin columnar grains were generated for stainless steel even treated with higher magnetic intensity. It is deemed that grain refinement can be attributed to the heterogeneous nucleus created on the mould wall as well as their falling by the oscillating resulting from the magnetic field. In contrast, a dense chilling layer was generated at the primary solidification stage of the stainless steel due to the large temperature gradient between the high temperature melt and the mould and accordingly the nucleus falling was prevented. Therefore, only dendrites refinement possibly occurred.