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首页> 外文期刊>ISIJ international >Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath
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Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath

机译：熔融锌浴中顶部渣滓的结构和机械特性

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In a molten zinc bath in a continuous galvanizing line (CGL), top dross particles crystallize as Fe-Al-Zn intermetallic compounds. These particles easily adhere to the steel sheets causing surface defects. Therefore, controlling the top dross particles is a key issue. Our study focused on the structural and mechanical characterizations of the top dross particles using an electron probe micro analyzer, X-ray diffraction, electron back scattering diffraction, Vickers hardness measurements, and nano-indentation measurements. The following results were obtained: (1) The crystal structure of the top dross particles Fe_2Al_5Zn_x having 37-38 wt% Fe, 44-45 wt% Al, and 18-19 wt% Zn belongs to the orthorhombic system with lattice constants of a = 7.61 A, b = 6.48 A, and c = 4.23 A. The a-axis of Fe_2Al_5Zn_x becomes shorter, while its b- and c-axes become longer compared to those of the binary Fe_2Al_5. (2) The coarsening of the top dross particles with the faceted interface was postulated to occur as a result of the driving force provided by the aniso-tropic interface energy between the top dross particles and molten Zn, rather than via the aggregation mechanism. (3) The hardness and the elastic modulus of the top dross particles are the lowest in the [001] orientation, similar to Fe_2Al_5, and are lower than those of Fe_2Al_5. (4) The fracture toughness of the top dross particles is approximately 1.1 MPa·m~(1/2), which is slightly lower than that of Fe_2Al_5.
机译：在连续镀锌线（CGL）中的熔融锌浴中，顶部渣滓颗粒作为Fe-Al-Zn金属间化合物结晶。这些颗粒容易粘附在引起表面缺陷的钢板上。因此，控制顶部渣滓粒子是一个关键问题。我们的研究专注于使用电子探针微分析仪，X射线衍射，电子背散射衍射，维氏硬度测量和纳米缩进测量的顶部渣滓颗粒的结构和机械表征。获得以下结果：（1）具有37-38wt％Fe，44-45wt％Al和18-19wt％Zn的顶部渣滓颗粒Fe_2Al_5Zn_x的晶体结构属于具有晶格常数的晶片常系数= 7.61a，b = 6.48a和c = 4.23a。FE_2AL_5ZN_X的A轴变短，而其B轴和C轴变长与二进制FE_2AL_5相比。 （2）假设具有刻面界面的顶部堆叠颗粒的粗化，以由于顶部渣滓颗粒和熔融Zn之间的aniso - 热带界面能量提供的驱动力而不是通过聚集机构而发生。 （3）顶部渣滓颗粒的硬度和弹性模量是[001]取向中最低的，类似于FE_2AL_5，并且低于FE_2AL_5的尺寸。 （4）顶部渣滓颗粒的断裂韧性约为1.1MPa·m〜（1/2），略低于Fe_2Al_5。

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