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首页> 外文期刊>ISIJ international >Effects of carbon contents in steels on alloy layer growth during hot-dip aluminum coating
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Effects of carbon contents in steels on alloy layer growth during hot-dip aluminum coating

机译：钢中碳含量对铝热浸镀层中合金层生长的影响

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摘要

Hot-dip aluminum coating of hypo-eutectoid steels containing 0.05-0.88 mass percent carbon were performed, and the alloy layers formed in the coating were investigated. In the hot-dip aluminum coating at immersion temperatures ranging from 700 to 850 deg C, the alloy layers on the steels consisted of a single phase of the intermetallic compound Fe_2Al_5. The thickness of the alloy layer increased in proportion to the increasing square root of the immersion time (t~(1/2)) for immersion temperatures lower than 800 deg C for the whole base steel. On the other hand, for immersion temperatures higher than 800 deg C, the thickness of the alloy layer on the 0.05 mass percent C steel and 0.45 mass percent C steels exhibited a negative deviation from the linear relationship. The growth rate constant k decreased as the carbon concentration of the base steel increased up to 0.8 percent, above which k had a constant value. The reaction activation energies for the base steel in this study were approximately 70-80 kJ/mol. The alloy layer/base steel interfaces were serrated, and the serration width decreased with increasing carbon concentration of the base steel. In addition, the serration width had a larger value in the immersion temperature range wherein the pro-eutectoid ferrite content in the base steel was larger.
机译：对碳含量为0.05-0.88％的次共析钢进行热浸镀铝，并研究了在镀层中形成的合金层。在浸入温度为700至850摄氏度的热浸铝涂层中，钢上的合金层由单相金属间化合物Fe_2Al_5组成。对于整个母钢，当浸入温度低于800℃时，合金层的厚度与浸入时间的平方根成正比（t〜（1/2））成比例地增加。另一方面，对于高于800℃的浸渍温度，在0.05质量％的C钢和0.45质量％的C钢上的合金层的厚度与线性关系显示出负偏差。生长速度常数k随着基础钢的碳浓度增加到0.8％而降低，在此之上，k具有恒定值。在这项研究中，基础钢的反应活化能约为70-80 kJ / mol。合金层/基体钢的界面呈锯齿状，且锯齿状宽度随基体碳含量的增加而减小。另外，在母材中原共析铁素体含量较大的浸渍温度范围内，锯齿宽度的值较大。

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