硅含量对火花放电原子发射光谱法测定超低碳钢中碳含量的影响

The influence of silicon content on carbon content measurement in ultra-low carbon steel using spark discharge atomic emission spectroscopy

通过火花放电原子发射光谱法(以下简称光谱法)对不同合金成分的超低碳钢(w(C)≤0.003%)进行对比实验,发现不同硅含量的试样对光谱法检测碳含量的准确性存在显著性差异。过高的硅含量(w(C)≥0.8%)金相组织上的存在明显差异,光谱法检测碳值时碳检测值偏高。同时,高含量硅使得样品冷却过程中温度下降的速度减缓,增加析出物的量,析出物的量增加会使光谱蒸发过程中的蒸发能增加,也会使光谱法分析中碳值偏高。

Through comparative experiments using spark discharge atomic emission spectroscopy(referred to as the spectroscopic method)on ultra-low carbon steel(w(C)≤0.003%)with different alloy compositions,it was found that there are significant differences in the accuracy of carbon content detection by the spectroscopic method among samples with different silicon contents.Excessively high silicon content(w(Si)≥0.8%)resulted in noticeable differences in the metallographic structure,causing the detected carbon values to be higher.Additionally,high silicon content also led to a slower cooling rate during the sample cooling process,increasing the quantity of precipitates.An increased amount of precipitates contributes to higher evaporation energy during the spectroscopic evaporation process,which further results in elevated carbon values in the spectroscopic analysis.