不锈钢材料的准分子激光打标

介绍了微机控制准分子激光打标系统并进行了不锈钢表面打标的研究。在不同激光能量密度下不锈钢表面发生不同的变化;通过对激光作用不锈钢表面温度的计算得出打标阈值,即不锈钢熔点温度所对应的激光能量密度;在阈值以上激光作用下不锈钢表面形成镜面,而在阈值以下则出现氧化层。温度计算表明,激光表面相互作用时温度变化（升温或冷却）速率达１０１０℃／ｓ,可形成非晶态。

Marking of Stainless Steel by an Excimer Laser

With a computer controlled excimer laser marking system, we studied marking processes of stainless steel. On the conditions of different laser fluences, the laser irradiated surface of stainless steel appears different. The marking threshold (the laser fluence corresponding to the melting point of iron) can be concluded by calculating the laser induced surface temperature. As the laser fluence exceeds the threshold a mirror surface appears, otherwise, an oxide layer will be formed. The calculation shows that the rates of surface temperature variation (heating rates or cooling rates) of 10ic "C /s can be obtained, which means a noncrystalline layer should be formed on steel.