Laser processing of materials

Majumdar, Jyotsna Dutta; Manna, I.

doi:10.1007/bf02706446

Cited by 320 publications

(121 citation statements)

References 156 publications

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“…The spatial and temporal distribution, T(x, y, t) satisfies the following differential equation for two dimensional heat conduction in a domain D [2]. The governing equation for the model is based on the Fourier law heat conduction and is given as; (2) Where, k(T) thermal conductivity as a function of temperature (W/mK), ρ is the material density (kg/cm 3 ), c(T) is specific heat as a function of temperature (J/kg K) and Qint is the heat generation rate (W/m 3 ).…”

Section: Heat Transfer Analysismentioning

confidence: 99%

“…The laser cutting of Ti and its alloys have many applications in various fields such as aerospace food, chemical etc. Ti and its alloys are difficult to cut by laser as they have low thermal conductivity and high chemical reactivity [2]. Also high temperature gradient arises near the cut edges that cause high temperature and thermal stresses near it.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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Abstract-Laser cutting process is thermal energy based advanced machining process. Due to thermal nature of the process, some defects related to thermal such as heat affected zone, oxide layers and micro-cracks may be observed at the cut edges of laser cut specimens. And also, the thermal conductivity as well as thermal diffusivity of Tialloy is very low, so the temperature is concentrated at the localized area in cut edges. The conventional cutting of Tialloys is difficult due to its properties such as low thermal conductivity, low thermal diffusivity and low elastic modulus. Laser cutting may be used for the cutting of these alloys. In this paper, the temperature distribution during the laser cutting of Ti-alloy sheet has been simulated by using finite element based ANSYS software. For the simulation, moving heat source has been considered. The simulation results show that the maximum temperature is obtained just below the laser beam. As the laser beam moves, there is reduction in the temperature in the moving direction of laser beam. The maximum temperature is found in very narrow area just below to the laser beam due to very low thermal conductivity of Ti-alloys.

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Section: Heat Transfer Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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“…The laser can be scanned on the surface to produce overlapping parallel tracks to modify a larger area of the surface. 26,27 LSM has been used extensively for surface modifications of Mg and its alloys. The improvement in the surface properties is primarily from the formation of fine dendritic grains in the modified region.…”

Section: Laser Surface Melting (Lsm)mentioning

confidence: 99%

Laser Surface Engineering of Magnesium Alloys: A Review

Singh

Harimkar

2012

JOM

123

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Magnesium (Mg) and its alloys are well known for their high specific strength and low density. However, widespread applications of Mg alloys in structural components are impeded by their insufficient wear and corrosion resistance. Various surface engineering approaches, including electrochemical processes (plating, conversion coatings, hydriding, and anodizing), gas-phase deposition (thermal spray, chemical vapor deposition, physical vapor deposition, diamond-like coatings, diffusion coatings, and ion implantation), and organic polymer coatings (painting and powder coating), have been used to improve the surface properties of Mg and its alloys. Recently, laser surface engineering approaches are attracting significant attention because of the wide range of possibilities in achieving the desired microstructural and compositional modifications through a range of laser-material interactions (surface melting, shock peening, and ablation). This article presents a review of various laser surface engineering approaches such as laser surface melting, laser surface alloying, laser surface cladding, laser composite surfacing, and laser shock peening used for surface modification of Mg alloys. The laser-material interactions, microstructural/compositional changes, and properties development (mostly corrosion and wear resistance) accompanied with each of these approaches are reviewed.

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“…Conventional processing of 316L can provide crystalline anisotropy and inter-crystalline defects. The latter crystalline features can provide the dislocation nucleation sites and shorter diffusion paths for enhanced oxidation and corrosion degradation [7,8]. Laser treatments can provide more homogenous structures and amorphisation which can overcome this latter problem.…”

Section: Introductionmentioning

confidence: 99%

Process mapping of laser surface modification of AISI 316L stainless steel for biomedical applications

2010

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A 1.5-kW CO 2 laser in pulsed mode at 3 kHz was used to investigate the effects of varied laser process parameters and resulting morphology of AISI 316L stainless steel. Irradiance and residence time were varied between 7.9 to 23.6 MW/cm 2 and 50 to 167 µs respectively. A strong correlation between irradiance, residence time, depth of processing and roughness of processed steel was established. The high depth of altered microstructure and increased roughness were linked to higher levels of both irradiance and residence times. Energy fluence and surface temperature models were used to predict levels of melting occurring on the surface through the analysis of roughness and depth of the region processed. Microstructural images captured by the SEM revealed significant grain structure changes at higher irradiances, but due to increased residence times, limited to the laser in use, the hardness values were not improved.

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Laser processing of materials

Cited by 320 publications

References 156 publications

Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

Modeling and Simulation of Temperature Distribution in Laser Cutting of Ti-Alloy Sheet

Laser Surface Engineering of Magnesium Alloys: A Review

Process mapping of laser surface modification of AISI 316L stainless steel for biomedical applications

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