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激光诱导击穿光谱技术(LIBS)作为一种快速而简单地检查钢表面缺陷的技术,可直接观测到激光脉冲被聚焦于样品之上而感生的等离子体发射物。一个平凸透镜把斑直径大约为1 mm的光量开关Nd:YAG激光器(脉宽:12 ns;重复频率:10 Hz)辐照聚焦于样品表面,用来烧蚀样品的一部分,形成一个微等离子体。等离子体的发射由光纤传送至帕邢-龙校格装置多色仪(焦距:500 mm)。在已被流入和流出的氩气排空的空间里,样品被安装在一个二维移动台上进行两点分析——常规分析和缺陷分析。通过比较两个分析结果,可检测到缺陷部分有显著信号强度的元素。由不同类型的夹杂物可以检测出典型的元素,由氧化铝可检测出铝,由保护渣可检测出铝、钙、镁、硅和钠,由矿渣可检测出铝、钙和镁。经证实,由LIBS分析得到的结果与EPMA(电子探针)研究得到的结果一致。因此,导致缺陷的夹杂物的类型都能通过LIBS技术确定属性。当涂层被激光烧蚀去掉后,镀锌钢也可以被直接分析出来。包括制样,该项技术评定时间不到半小时,因此在炼钢过程中,可以迅速采取合适措施。
Laser Induced Breakdown Spectroscopy (LIBS) As a technique for quickly and simply inspecting steel surface defects, plasma projectiles can be directly observed where laser pulses are focused on the sample. A plano-convex lens was focused on the sample surface by a light-switch Nd: YAG laser (pulse width: 12 ns; repetition frequency: 10 Hz) with a spot diameter of about 1 mm to ablate a portion of the sample to form a micro-plasma . Plasma emission was sent by optical fiber to a Paschen-Long cell polychrometer (focal length: 500 mm). The sample was installed on a two-dimensional mobile station for two-point analysis - routine analysis and defect analysis in the evacuated argon flow into and out of the sample. By comparing the results of two analyzes, elements with significant signal strength in the defect portion can be detected. Typical elements can be detected by different types of inclusions, aluminum is detectable by aluminum oxide, aluminum, calcium, magnesium, silicon and sodium are detected by mold flux and aluminum, calcium and magnesium are detected by slag. It has been confirmed that the results obtained by LIBS analysis are consistent with those obtained by the EPMA (Electron Probe) study. Therefore, the types of inclusions that cause defects can be determined by the LIBS technique. When the coating is ablated by laser ablation, galvanized steel can also be analyzed directly. Including sample preparation, the technology assessment time of less than half an hour, so the steel making process, you can take prompt and appropriate measures.