CAJ | 학술논문

激光诱导击穿光谱（L IB S ）是近十几年来快速发展的一种新的表面分析工具，由于具有分析速度快、灵敏度高等优点，故在材料科学领域引起广泛的关注。文中采用 LIBS、扫描电子显微镜/能谱仪（SEM/EDS ）和电子探针显微分析（EPM A ）三种分析方法，对两类不同焊缝的熔合线区域进行线扫描分析，研究了Ni ，M n ，C ，Si等元素在熔合线区域含量的变化情况。结果表明，对于含量较高且焊缝和母材成分差别较大的Ni和M n元素，三种方法获得了一致的分析结果，两试样焊缝内的Ni和M n含量均高于母材，在熔合线区域明显体现出浓度梯度分布。三种方法根据Ni和M n的浓度分布测得的熔合线区宽度值比较接近。对于含量较低且焊缝和母材成分差别较小的C和Si元素，采用SEM/EDS和EPM A时，焊缝与母材之间的成分差异没有分析出来；而采用L IB S时，两区域的成分差异则可以清晰的展现出来，在熔合区域能够清楚观察到浓度梯度分布曲线。LIBS的分析灵敏度明显高于SEM/EDS和EPM A ，在分析低含量元素时更具优势。
격광유도격천광보（L IB S ）시근십궤년래쾌속발전적일충신적표면분석공구，유우구유분석속도쾌、령민도고등우점，고재재료과학영역인기엄범적관주。문중채용 LIBS、소묘전자현미경/능보의（SEM/EDS ）화전자탐침현미분석（EPM A ）삼충분석방법，대량류불동한봉적용합선구역진행선소묘분석，연구료Ni ，M n ，C ，Si등원소재용합선구역함량적변화정황。결과표명，대우함량교고차한봉화모재성분차별교대적Ni화M n원소，삼충방법획득료일치적분석결과，량시양한봉내적Ni화M n함량균고우모재，재용합선구역명현체현출농도제도분포。삼충방법근거Ni화M n적농도분포측득적용합선구관도치비교접근。대우함량교저차한봉화모재성분차별교소적C화Si원소，채용SEM/EDS화EPM A시，한봉여모재지간적성분차이몰유분석출래；이채용L IB S시，량구역적성분차이칙가이청석적전현출래，재용합구역능구청초관찰도농도제도분포곡선。LIBS적분석령민도명현고우SEM/EDS화EPM A ，재분석저함량원소시경구우세。
Over the past decade there has been intense activity in the study and development of laser-induced breakdown spectros-copy (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 break-down 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 EP-MA .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 fu-sion 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 EP-MA .