Element Distribution Analysis of Welded Fusion Zone by Laser-Induced Breakdown Spectroscopy
YANG Chun1, 2, ZHANG Yong1, JIA Yun-hai1*, WANG Hai-zhou1
1. Central Iron & Steel Research Institute，Beijing 100081, China 2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Abstract：Over the past decade there has been intense activity in the study and development of laser-induced breakdown spectroscopy (LIBS). As a new tool for surface microanalysis, it caused widespread in materials science because of the advantage of rapid and high sensitivity. In the present paper, the distribution of Ni, Mn, C and Si near weld fusion line was analyzed on two kinds of weld sample. Line scanning mode analysis was carried out by three different kinds of methods, namely laser-induced breakdown spectroscopy (LIBS), scanning electron microscope/energy dispersive spectrometer (SEM/EDS) and electron probe X-ray microanalyser (EPMA). The concentration variation trend of Ni and Mn acquired by LIBS is coincident with SEM/EDS and EPMA. The result shows that the content of Ni and Mn was significantly different between weld seam and base metal on both the samples. The content of Ni and Mn was much higher in weld seam than in base metal, and a sharp concentration gradient was analyzed in the fusion zone. According to the distribution of Ni and Mn, all the three methods got a similar value of welded fusion zone width. The concentration variation trend of C and Si acquired by LIBS is not coincident with SEM/EDS and EPMA. The concentration difference between weld seam and base metal was analyzed by LIBS, but had not by SEM/EDS and EPMA, because of the low concentration and slight difference. The concentration gradient of C and Si in fusion zone was shows clearly by LIBS. For higher sensitivity performance, LIBS is much more adapted to analyze low content element than SEM/EDS and EPMA.
Key words：Laser-induced breakdown spectroscopy;Element distribution;Welding seam;Fusion zone
杨 春1, 2，张 勇1，贾云海1*，王海舟1 . 激光诱导击穿光谱对焊缝熔合区的元素成分分布分析 [J]. 光谱学与光谱分析, 2014, 34(04): 1089-1094.
YANG Chun1, 2, ZHANG Yong1, JIA Yun-hai1*, WANG Hai-zhou1 . Element Distribution Analysis of Welded Fusion Zone by Laser-Induced Breakdown Spectroscopy . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 1089-1094.
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