Study on analytical method for the content of aluminium inclusions in heavy rail steel by laser-induced breakdown spectroscopy
HAN Zhong-jie1, LIU Jia1, WANG Hui1, CHEN Ji-wen*1,2
1. Central Iron & Steel Research Institute, Beijing 100081, China; 2.Collge of Electrical and Control Engineering, North China University of Technology, Beijing 100144, China
Abstract：The inclusions in steel had an important influence on the properties of iron and steel materials. The solidified inclusions in molten steel would decrease the physical properties of steel. In order to eliminate the influence of inclusions, it was necessary to establish a method for determination of inclusions in steel. A new analysis method for the content of aluminum inclusions in steel by laser-induced breakdown spectroscopy (LIBS) was investigated based on the abnormal signal response and threshold selection of aluminum inclusions in heavy rail steel samples. Because most of aluminum inclusions in steel existed in the form of acid-insoluble aluminum, the content of aluminum inclusions in the calculation model adopted in proposed investigation was considered to be the same as that of acid-insoluble aluminum. Since the content of aluminum inclusions in the tested middle-low alloy steel was too low in experiments, five heavy rail steel samples out of nine were randomly selected as the reference samples for testing. By screening the abnormal signals in LIBS results and the calculation models in the published literature, it was found that the calculated values of inclusions in LIBS results were basically consistent with the true values when the confidence interval threshold was K=2.6. Thus the mathematical model for the analysis of aluminum inclusions by LIBS was established. The proposed method was applied for the detection of four remaining samples of heavy rail steel, and the found results were basically consistent with those obtained by chemical wet method.
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HAN Zhong-jie, LIU Jia, WANG Hui, CHEN Ji-wen. Study on analytical method for the content of aluminium inclusions in heavy rail steel by laser-induced breakdown spectroscopy. , 2019, 39(6): 1-6.
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