不同硬度受热面材料的激光诱导等离子体光谱特性分析

Laser-Induced Plasma Spectra of Heating Surface Materials with Different Hardnesses

将激光诱导击穿光谱(LIBS)用于锅炉受热面材料特性分析,选用受热面常用的珠光体耐热钢12Cr1MoV,并通过热处理工艺制备了不同硬度的实验样品。选择样品中基体元素Fe和合金元素Mn、Cr、V合适的分析谱线,对比分析了不同硬度条件下离子谱线与原子谱线的强度比和等离子体温度的变化规律。实验结果表明,由于等离子体冲击波特性差异和激光烧蚀质量的变化,导致了特征元素离子谱线与原子谱线强度比随着样品硬度的增加而增强,等离子体温度随硬度的增加而升高。

Laser-induced breakdown spectroscopy （LIBS） is used to analyze the properties of boiler heating surface materials. Ovenproof steel 12Cr1MoV is made to a series of samples with different hardnesses by heat treatment process. The appropriate spectral lines of the characteristic elements are selected and the impact of different hardnesses on laser induced plasma properties of alloy steel is analyzed. Not only the relation between the hardness and the ionic to atomic spectral lines intensity ratio of a matrix element and three alloy steel elements, but also the relation between the hardness and the plasma temperature is analyzed. Experimental results show that the ionic to atomic spectral lines intensity ratio and plasma temperature increased with the increasing hardness, because the plasma shockwave characteristic and the ablation quality are different.