Abstract：Nonmetallic inclusion is one of main factors influencing the quality and performance of steels. The automatic analysis function of scanning electron microscope (SEM) is a common method for the detection of inclusions in steels, and it has the advantages of high degree of operation automation and abundant data of detection results. This function was employed to determine the tundish molten steel sample and wire rod sample of one low carbon low alloy steel after compound deoxidation by aluminum, silicon and manganese. The utilization of main data in detection results was introduced in the manner of cases. The composition and type of inclusions were judged based on the content of elements. The inclusions in experiments included MnS and various oxides in experiments. The equivalent diameter (ECD) could be used for size analysis. Then the cleanliness level of steel quality could be evaluated by combining with the information of quantity, and to guide the optimization of inclusion control technology. The average ECD of inclusions in tundish molten steel sample and wire rod sample in experiments were 1.89 μm and 1.14 μm, respectively. The size of former one was much larger than the later one, while the density of inclusions in the former one was lower than that in the later one. In terms of type, silicate and aluminosilicate inclusions were two main types of oxide inclusions in experiments. The size of the former one was slightly smaller with average ECD of about 1.005 μm. The quantity of the later one was the most, the proportion in the wire rod sample exceeded 50%. The position of inclusions could be also located according to the detection results. Various inclusions were all randomly distributed on two types of samples in experiments. The deformation of inclusions increased with the increase of size in rolling process. Along with the distribution position from the edge to the core of the matrix, the deformation increased firstly and then decreased. The length-width ratio of sulfides was higher than that of oxides. The length-width ratio of calcium-modified oxides was larger than that before modification.
陈涛, 易敏, 丁宁, 严春莲, 其其格, 肖国强. 扫描电镜夹杂物自动分析功能在钢材上的应用[J]. 冶金分析, 2023, 43(1): 41-48.
CHEN Tao, YI Min, DING Ning, YAN Chunlian, QI Qige, XIAO Guoqiang. Application of automatic analysis function of scanning electron microscope for detection of inclusion in steel. , 2023, 43(1): 41-48.
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