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首页> 外文期刊>Applied Surface Science >Metallographical analysis of steel and hard metal substrates after deep-drilling with femtosecond laser pulses
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Metallographical analysis of steel and hard metal substrates after deep-drilling with femtosecond laser pulses

机译：飞秒激光脉冲深加工后的钢和硬质金属基底的金相分析

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摘要

Investigations on the evolution of the ablated depth over a large number of incident femtosecond laser pulses and the occurrence of structure and hardness changes in the immediate vicinity of the laser induced craters (for two sorts of steel and a hard metal substrate) are reported in this work. Experiments were performed in air with a Ti:sapphire laser (800 nm, 100 fs) at mean fluences of 2, 5 and 10 J/cm~2. After the laser irradiation, cuts were made through the processed samples and pore-cross-sections were obtained. Through their metallographical analysis it was possible to evidence crystalline structure changes in the immediate vicinity of the laser induced microholes; the extent of modified material zones increased for higher laser fluences. In such zones, a chemical composition quasi similar to that of the raw material was found and the performed nanohardness tests revealed hardness increases.
机译：在此报告了对大量飞秒激光脉冲的烧蚀深度的演变以及在激光诱发的陨石坑附近（对于两种钢和硬质金属基材）发生组织和硬度变化的研究。工作。实验是使用Ti：蓝宝石激光（800 nm，100 fs）在空气中以2、5和10 J / cm〜2的平均通量进行的。激光照射后，将加工过的样品切开并获得孔横截面。通过他们的金相分析，有可能证明激光诱导的微孔附近晶体结构发生了变化。对于更高的激光通量，改性材料区域的范围增加了。在这样的区域中，发现化学成分与原料的化学成分大致相似，并且进行的纳米硬度测试显示硬度增加。

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