Analysis of melt-through process of 1.07 μm continuous wave high power laser irradiation on metal

Lee, Kyung-Cheol; Baek, Won-Kye; Kwon, Hyukjoon; Shin, Wan-Soon; Yoh, Jack J.

doi:10.1007/s12206-013-0425-z

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…12 as a function of the beam radius and compared to data available in literature. 8,12 All values of a(r S ) lie within the reported lower and upper boundaries. We also observe that a(r S ) decreases with r S .…”

Section: Resultssupporting

confidence: 63%

“…For a smooth iron or steel surface, the average normal emissivity in the bolometer's spectral range is 0.2 at room temperature and gradually increases with temperature up to 0.95 due to the growth of an oxide layer. 8,14,[24][25][26][27] A steep drop in the emissivity after the solidliquid phase transition 14,22 of the material therefore corresponds to a decrease of the measured bolometer temperature T BM . This allows the extraction of the melt time t M , the time at which the melt front reaches the back side of the plate.…”

Section: Resultsmentioning

confidence: 99%

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Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

Horak

Heunoske

Lueck

et al. 2015

Journal of Laser Applications

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The phenomena occurring during laser-metal interaction depend on a variety of parameters such as laser wavelength, intensity, and thermophysical and optical properties of the irradiated material. This work comprises a detailed study of the perforation process of thin iron and steel plates under CW laser radiation at a wavelength of 1.07 lm. Experiments were carried out over a wide range of intensities between 0.1 and 100 kW/cm 2 , and with beam radii in the millimeter and centimeter range. Additionally, we describe a method applying contact-free radiative temperature measurements, which allows the measurement of melt-through times without an exact knowledge of the plate's spectral surface emissivity. A detailed numerical model is presented and employed to analyze, interpret, and predict data gathered from the experiments. The model is shown to produce accurate predictions and is in good agreement with experimental data. Furthermore, our results indicate that in the investigated regime perforation is governed by gravitational and surface forces. Based on this hypothesis, a criterion for the onset of the perforation explaining the observed local minimum in the perforation time versus beam radius curve is presented. V C 2015 Laser Institute of America. [http://dx

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

Horak

Heunoske

Lueck

et al. 2015

Journal of Laser Applications

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“…The 3 meter high DN219 Thermal Energy Storage tank with its slenderness reflects the system that could potentially be installed in a mine shaft. The tank has a wall thickness of 3 mm and is made of stainless steel with a temperature dependent thermal conductivity of 14.1-18.3 W/mK [25]. Basalt grit with an average diameter of 15.5 mm was selected as the tank fill material.…”

Section: Methodsmentioning

confidence: 99%

Role of Thermal Energy Storage Technology in the Decarbonization of Energy Sector Process – Packed Rock Bed Parameters Analysis

Ochmann

Jurczyk

Bartela

2022

Architecture, Civil Engineering, Environment

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The paper presents the adiabatic installation of compressed gases energy storage. The authors present the results of analyzes for this type of installation due to the selection of thermal storage material. The simulations were carried out for basalt, granite and ceramics (alumina) as well as for porosity value from 0.375 to 0.39 of basalt-filled reservoirs in Thermal Energy Storage (TES) installation. Characteristics of outlet air temperature, air pressure drop amount of energy stored and external heat losses as a time functions during the charging phase are presented. The research indicated that due to the lowest density and average heat capacity of the materials studied, granite has the fastest and most intense physical exit loss from the storage tank which was approximately 1100 W. However, there was no significant effect on air pressure drop depending on the chosen accumulation materials. The effect of rock bed porosity on the pressure drop of flowing air was investigated. For a constant mass flow rate, pressure drop values ranging from 2200 Pa to 6200 Pa were obtained depending on the porosity value.

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“…The other effects begin at progressively higher energy thresholds that depend on the material. Thus, most studies on laser-material interactions have included the determination of these thresholds, and metallic materials have been actively researched, including theoretical and experimental investigations [7][8][9][10]. In crystalline materials such as silicon wafers, however, slip can occur before melting, which can easily lead to fracture of brittle materials even at temperatures below the melting point.…”

mentioning

confidence: 99%

In situ detection of laser-induced slip initiation on the silicon wafer surface

Choi

Jhang

2014

Opt. Lett.

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We propose a real-time in situ method to detect slip initiation on the surface of silicon wafers during high-power laser beam irradiation. In this method, light is collected from the surface of a silicon wafer subjected to laser irradiation. When the slip is initiated, it strongly scatters the laser beam, allowing detection of the time of the slip initiation based on the resulting sudden increase in the scattering signal. To demonstrate the performance of this method, a silicon wafer specimen was illuminated by a near-infrared continuous-wave fiber laser beam (of wavelength 1070 nm) at four different laser powers, and the scattered light was detected. The scattering signal increased suddenly at the time of slip initiation. To confirm the occurrence of slip, the surface morphologies of the silicon specimens after laser irradiation were analyzed using an optical microscope; surface slips were observed only in the specimens for which the sudden increase in scattering had been detected. Thus, the proposed method is shown to be very effective for the real-time in situ detection of surface slip initiation induced by high-power laser beam irradiation on silicon wafers.

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Analysis of melt-through process of 1.07 μm continuous wave high power laser irradiation on metal

Cited by 5 publications

References 13 publications

Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

Role of Thermal Energy Storage Technology in the Decarbonization of Energy Sector Process – Packed Rock Bed Parameters Analysis

In situ detection of laser-induced slip initiation on the silicon wafer surface

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