Determining Absorptivity Variations of Multiple Laser Beam Treatments of Stainless Steel Sheets
Determining Absorptivity Variations of Multiple Laser Beam Treatments of Stainless Steel Sheets
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DOI：
10.3390/jmmp2040084
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发表时间：
2018-12-01
影响因子：
3.2
通讯作者：
Vollertsen, Frank
中科院分区：
文献类型：
--
作者：
Kuegler, Helge;Vollertsen, Frank
在几个研究中研究了金属对激光辐射的吸收率。因此，依赖于温度或粗糙度的吸收系数是已知的。然而，许多工艺使用迭代加工策略，例如添加制造、激光光束弯曲或激光辅助增量成形。对这些过程的模拟通常使用吸收系数的文献数据，并且没有考虑过程中吸收率的变化。研究了多束激光处理对不锈钢板材吸收率的影响。对激光或烘箱加热处理前后的吸光度和粗糙度进行了比较。结果表明，激光加热循环次数越多，吸收率越高，粗糙度越高。然而，这种粗糙度的增加被认为不足以提高吸收率。一方面，在烘箱中加热钢板时，吸收率也有类似的变化。这些烘箱加热的样品没有表现出广泛的粗糙度变化。另一方面，相同数量的激光加热循环，在每次循环后增加冷却时间，导致吸收率变化可以忽略不计。因此，吸光系数的变化归因于氧化。
The absorptivity of laser radiation of metals is investigated in several studies. Therefore, absorption coefficients depending on temperature or roughness are known. However, many processes use iterative processing strategies, such as additive manufacturing, laser beam bending, or laser-assisted incremental forming. Simulations of these processes often use literature data for absorption coefficients and do not consider the variation of absorptivity during the process. In this study, the influences of multiple laser beam processing on absorptivity are investigated for stainless steel sheets. Absorption and roughness measurements are compared before and after heating treatments with the laser beam or in an oven. It is shown that an increasing amount of laser heating cycles correlates with higher absorptivity and higher roughness values. However, this increase of roughness is not considered to be sufficient for enhanced absorptivity. On the one hand, similar changes of absorptivity were detected when heating steel sheets in an oven. These oven-heated specimens do not show extensive roughness changes. On the other hand, the same amount of laser heating cycles with additional cool down time after each cycle results in a negligible absorptivity change. Therefore, the variation of the absorptivity is attributed to oxidation.