Case study of laser hardening process applied to 4340 steel cylindrical specimens using simulation and experimental validation

Fakir, Rachid; Barka, Noureddine; Brousseau, Jean

doi:10.1016/j.csite.2017.12.002

Cited by 37 publications

(21 citation statements)

References 16 publications

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“…These actually illustrate the temperature field, in this way showing the temperature distribution in the heat-affected zone. Studies of the thermal state of the surface layers of materials subjected to laser irradiation can be found in [33][34][35][36]. They show that the characteristics of the temperature field in materials (the value and gradient of temperatures, heating and cooling rates) are greatly influenced by beam parameters, the movement speed of the heat source, the power density distribution of the beam, thermal and physical characteristics, and the size of the processed objects.…”

Section: Optical Systems For the Shaping Of Laser Beamsmentioning

confidence: 99%

Analysis of the Advantages of Laser Processing of Aerospace Materials Using Diffractive Optics

Murzin

Kazanskiy

Stiglbrunner

2021

Metals

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We considered possibilities of an application of diffractive free-form optics in laser processing of metallic materials in aerospace production. Based on the solution of the inverse problem of heat conduction, an algorithm was developed that calculates the spatial distribution of the power density of laser irradiation in order to create the required thermal effect in materials. It was found that the use of diffractive optics for the laser beam shaping made it possible to obtain specified properties of processed materials. Laser thermal hardening of parts made of chrome–nickel–molybdenum steel was performed. This allowed us to increase the wear resistance due to the creation in the surface layer of a structure that has an increased hardness. In addition, a method of laser annealing of sheet materials from aluminum–magnesium alloy and low-alloy titanium alloys was developed. Application of this method has opened opportunities for expanding the forming options of these materials and for improving the precision in the manufacturing of aircraft engine parts. It was also shown that welding by a pulsed laser beam with a redistribution of power and energy density makes it possible to increase the strength of the welded joint of a heat-resistant nickel-based superalloy. Increasing the adhesion strength of gas turbine engine parts became possible by laser treatment using diffractive free-form optics.

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Section: Optical Systems For the Shaping Of Laser Beamsmentioning

confidence: 99%

Analysis of the Advantages of Laser Processing of Aerospace Materials Using Diffractive Optics

Murzin

Kazanskiy

Stiglbrunner

2021

Metals

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“…The initial temperature of the cylinder is assumed to be constant T(i, j, 0) = 27˚C. Equations (15) and 16  Condition 1:…”

Section: Discretization Of Model Equationsmentioning

confidence: 99%

“…In the field of laser heat treatment an interesting but little studied prediction using the finite difference method to predict the temperature distribution inside of a cylindrical workpiece in rotation was developed for a stationary point by the team of R. Fakir et al in 2018 [15]. Based on a similar and complementary approach, we developed and integrated in this study the focal spot scan parameters at the boundary conditions for efficient prediction of the case depth along the longitudinal axis of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation by the Finite Difference Method of the Laser Hardening Process Applied to AISI-4340

Fakir¹,

Barka²,

Brousseau³

et al. 2018

JAMP

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This paper presents a numerical and experimental analysis study of the temperature distribution in a cylindrical specimen heat treated by laser and quenched in ambient temperature. The cylinder studied is made of AISI-4340 steel and has a diameter of 14.5-mm and a length of 50-mm. The temperature distribution is discretized by using a three-dimensional numerical finite difference method. The temperature gradient of the transformation of the microstructure is generated by a laser source Nd-YAG 3.0-kW manipulated using a robotic arm programmed to control the movements of the laser source in space and in time. The experimental measurement of surface temperature and air temperature in the vicinity of the specimen allows us to determine the values of the absorption coefficient and the coefficient of heat transfer by convection, which are essential data for a precise numerical prediction of the case depth. Despite an unsteady dynamic regime at the level of convective and radiation heat losses, the analysis of the averaged results of the temperature sensors shows a consistency with the results of microhardness measurements. The feasibility and effectiveness of the proposed approach lead to an accurate and reliable mathematical model able to predict the temperature distribution in a cylindrical workpiece heat treated by laser.

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“…The material that can be hardened directly has a carbon content of at least 0.22 %. However, carburized steel and pre-nitrided steel can also be hardened [6].…”

Section: Introductionmentioning

confidence: 99%

New Hybrid System of Swarm Intelligence using for Minimal Path Travel on Contours

Babič¹

2021

AMS

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Anyone who observes ant colonies and swarms of bees gets the impression that they are following a certain plan. They are small states in which everyone seems to know their job and the sequence of which has always fascinated people: How would it be if this principle could be transferred to companies? In this article is presented new hybrid system of swarm intelligence using for minimal path travel on contours in mechanical engineering, especially in laser technology of hardening.

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Case study of laser hardening process applied to 4340 steel cylindrical specimens using simulation and experimental validation

Cited by 37 publications

References 16 publications

Analysis of the Advantages of Laser Processing of Aerospace Materials Using Diffractive Optics

Analysis of the Advantages of Laser Processing of Aerospace Materials Using Diffractive Optics

Numerical Investigation by the Finite Difference Method of the Laser Hardening Process Applied to AISI-4340

New Hybrid System of Swarm Intelligence using for Minimal Path Travel on Contours

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