金相组织对激光诱导钢铁等离子体的影响

Impact of Metallurgical Structure on Laser Induced Steel Plasma

将激光诱导击穿光谱技术应用于钢铁检测,研究了不同金相组织对激光诱导钢铁等离子体特性的影响。选用45#钢,通过热处理,分别得到珠光体+铁素体、贝氏体和马氏体3种不同金相组织的钢铁样品。分析了不同激光脉冲能量下,3种不同金相组织的等离子体温度、电子密度和元素特征谱线强度的变化规律。实验结果表明,不同金相组织钢铁的等离子体温度、电子密度和元素特征谱线强度随脉冲能量的变化趋势基本一致。相同实验条件下,珠光体+铁素体组织的等离子体温度、电子密度和元素谱线强度均较大,贝氏体组织次之,马氏体组织最小。

Laser-induced breakdown spectroscopy（LIBS） method was used to analyze steel samples.The impact of metallurgical structure on laser ablation properties of steel was analyzed.Heat-treating process was used on 45# steel to obtain three different metallurgical structures（pearlite＋ferrite,bainite,and martensite）.The changes of plasma temperature,electron density,and line intensity with laser energy for different metallurgical structures were analyzed.The results showed that plasma temperature,electron density,and line intensity of three different metallurgical structures had almost same tendency with the increase of laser energy.Under the same experimental conditions,the plasma temperature,electron density,and line intensity of pearlite＋ferrite were the highest,those of bainite were the second and those of martensite were the lowest.