Temperature-dependent absorptance of painted aluminum, stainless steel 304, and titanium for 1.07 μm and 10.6 μm laser beams

Kwon, Hyukjoon; Baek, Won-Kye; Kim, Myungsin; Shin, Wan-Soon; Yoh, Jack J.

doi:10.1016/j.optlaseng.2011.10.001

Cited by 47 publications

(26 citation statements)

References 13 publications

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“…For a wavelength of 10.6 µm the energy coupling efficiency is completely independent of the underlying process temperature. The measured trend in our experiments is identical compared to results in the literature [24], however, our values are lower. This can be a consequence of the much smaller surface roughness [7] of our used probes.…”

Section: Resultssupporting

confidence: 90%

“…While below approximately 1000 °C the coupling efficiency is independent of the temperature, above this temperature a slight decrease of efficiency was measured. The temperature independent energy coupling efficiency is in good agreement with the results for the absorptivity at temperatures below 600 °C in [24]. As mentioned before, the decrease of the absorptivity below the melting point was attributed to a cleaning effect of the surface [21].…”

Section: Resultssupporting

confidence: 88%

“…The decreasing coupling efficiency was ruled as due to a cleaning effect of the surface due to the laser irradiation. In [24] the increase in coupling efficiency for stainless steel started above 600 °C.…”

Section: Introductionmentioning

confidence: 99%

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Energy Coupling of Laser Radiation on AISI 304 Stainless Steel: Effect of High Temperatures and Surface Oxidation

2019

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The industrial application of laser materials processing methods is still far ahead of research into the physical phenomena occurring during these processes. In particular, the effect of high temperatures on the energy coupling of laser irradiation of metals is poorly understood. However, most processes in laser materials treatment involve temperatures above the melting point or even cause evaporation. This study therefore evaluates the effect of high temperatures on the energy coupling efficiency of stainless steel experimentally for three typical laser wavelengths (515 nm, 1.07 µm, 10.6 µm). As a result, it is shown that the effect of temperature on the energy coupling efficiency depends on the wavelength. In this context the relevance of the X-point phenomenon known from the emissivity theory could be demonstrated for laser material processing. Further, the effect of a process-induced surface oxidation is analyzed. At temperatures above 650 °C the energy coupling efficiency dramatically increases to around 65% at melting point and stays at this high level even in the liquid phase.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 88%

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Energy Coupling of Laser Radiation on AISI 304 Stainless Steel: Effect of High Temperatures and Surface Oxidation

2019

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“…4.34 it is shown that the first material removal, which is related to molten titanium, starts at laser powers of about 2.4 W. This removal is mainly the result of melt pool dynamics that throw out molten material from the center to the outer sides and is governed by temperatures that exceed the melting point of titanium (>1668°C). This can be explained by a sudden jump in the absorption coefficient by temperatures >800°C from 40% to >70% [Kwo12]. Figure 4.35 shows the resulting removal velocities v rem in titanium in dependence on the electrolyte used.…”

Section: Sustainable Electrolytes For Lcmmentioning

confidence: 99%

Tooling

Vollertsen

Seven

Messaoudi

et al. 2019

Lecture Notes in Production Engineering

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Micro metal parts are usually produced in large lot sizes at high production rates. In order to achieve sufficient product quality, excessive tool wear has to be avoided. In the micro range, so-called scaling effects and their influence on tool wear in micro forming have not been investigated so far. For the investigation, tests in micro deep drawing were carried out with metal sheets (s < 50 μm) of pure aluminum Al99.5, a copper alloy E-Cu58 and stainless steel 1.4301. The failure mechanisms of the micro cups produced were identified as bottom fracture and cup wall damage, and tool wear was measured and characterized with optical measurements and EDX analyses. Moreover, micro cups can be produced by DLC-and PVD-coated tools in a dry forming process. To investigate the wear behavior in a continuous process, a forming tool was developed with an integrated blanking and deep drawing die. The tool wear was measured optically, and the wear mechanisms could be identified in a combined micro and deep drawing process. As a result, the tool could be modified by a manufacturing in selective laser melting and the tool life increased by 290%. Furthermore, a method for tool wear examination in long-term tests was developed. In lateral micro upsetting, the tool wear history can be examined by analyzing the formed product. Several tool materials and coatings were tested with up to 500,000 strokes.

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“…Thermal conductivity, specific heat, and absorption are considered as functions of temperature. 22,23 These properties are updated at each time step in a numerical algorithm which makes them a function of space (eq. 2).…”

Section: A Temperature Calculationsmentioning

confidence: 99%

3D transient model to predict temperature and ablated areas during laser processing of metallic surfaces

Naghshine

Kiani

2017

AIP Advances

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Laser processing is one of the most popular small-scale patterning methods and has many applications in semiconductor device fabrication and biomedical engineering. Numerical modelling of this process can be used for better understanding of the process, optimization, and predicting the quality of the final product. An accurate 3D model is presented here for short laser pulses that can predict the ablation depth and temperature distribution on any section of the material in a minimal amount of time. In this transient model, variations of thermal properties, plasma shielding, and phase change are considered. Ablation depth was measured using a 3D optical profiler. Calculated depths are in good agreement with measured values on laser treated titanium surfaces. The proposed model can be applied to a wide range of materials and laser systems.

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Temperature-dependent absorptance of painted aluminum, stainless steel 304, and titanium for 1.07 μm and 10.6 μm laser beams

Cited by 47 publications

References 13 publications

Energy Coupling of Laser Radiation on AISI 304 Stainless Steel: Effect of High Temperatures and Surface Oxidation

Energy Coupling of Laser Radiation on AISI 304 Stainless Steel: Effect of High Temperatures and Surface Oxidation

Tooling

3D transient model to predict temperature and ablated areas during laser processing of metallic surfaces

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