Investigating double-scan strategies for reducing heat-affected zone in laser surface melting

Hijam, Justin; Balhara, Rama; Vadali, Madhu

doi:10.1016/j.optlastec.2023.110289

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Fauzun et al [7] highlighted that during laser surface melting treatment of AISI H13 tool steel, variations in different laser processing parameters (such as laser power, frequency, and scanning speed) yield differing or even opposing effects on surface integrity, including microstructure, hardness, and surface roughness. Additionally, Hijam et al [8] discovered that although increasing the number of laser scans benefits the enhancement of Ti6Al4V alloy hardness, it fails to alter the residual tensile stress state on the surface, resulting in a rougher surface. Furthermore, Charee et al [9] concluded that low laser scanning speeds induce the formation of micro grooves and elevate surface roughness on AISI 9254 spring steel.…”

Section: Introductionmentioning

confidence: 99%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In this paper, shot peening (SP) was employed as a post-processing technique for the laser surface melted (LSMed) gear. The aim was to improve the contact fatigue performance of laser surface melting+shot peened (LSMSPed) gears. The microstructure, surface roughness, residual stress, microhardness of C40 steel gears before and after SP treatment were characterized using scanning electron microscopy, X-ray diffraction stress analyzer, contour measuring instrument, and hardness tester. Fatigue test of gear was carried out with a Forschungsstelle für Zahnräder und Getriebebau (FZG) testing machine. Following the laser surface melting (LSM) treatment, a molten layer was observed on the gear teeth surface. The experimental results indicated that SP induced a hardened layer with a certain thickness and plastic deformation on the surface of LSMed gears. Importantly, as the SP parameters increased, there's a corresponding reduction in both the average grain diameter and the maximum grain diameter. The reduction was most pronounced when the shot diameter reached its maximum value. It's worth noting that once the optimal threshold for SP parameters is surpassed, the residual compressive stress and microhardness on the LSMSPed gear surface do not exhibit a continuous growth trend. Furthermore, the rise in SP parameters resulted in a gradual increase in the surface roughness of LSMSPed gears, albeit to varying degrees. In light of the combined effects of grain refinement, residual compressive stress, microhardness, and surface roughness, the contact fatigue performance of LSMSPed gears improved with increasing SP parameters. Notably, when comparing the contact fatigue life of LSMed gears with that of LSMSPed gears, we observed a substantial enhancement. However, it's essential to highlight that when the shot diameter reaches its maximum value, the contact fatigue life of the LSMSPed gear, somewhat unexpectedly, decreased.

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Section: Introductionmentioning

confidence: 99%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

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Parameter optimization and anisotropy mechanism in different build directions of the microstructures and mechanical properties for laser directed energy deposited Ti6Al4V alloy

Wang,

Lu,

Bian

et al. 2024

Materials Science and Engineering: A

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High-power laser material processing utilizing high-speed combined motion of scanner and linear axes system

Jamalieh,

Entessari,

Bohrer

2024

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIII

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An innovative approach to enhance high-power laser material processing through the integration of a high-speed motion system combining galvo scanner and linear axes is presented. The research focuses on its application in Printed Circuit Board (PCB) depaneling with lasers, showcasing its precision and efficiency. The combined motion system, featuring a galvo laser beam scanner and multi-axis linear actuator structure, is custom-designed to meet the specific demands of PCB depaneling. By combining the strengths of both components, complicated cutting patterns are achieved while minimizing thermal and mechanical stresses on the workpiece. Key to the system's success is the seamless integration of motion components, facilitating precise coordination and synchronization during laser processing. This ensures real-time transmission of control commands and feedback signals across multiple axes, optimizing the system's accuracy and efficiency.The motion system enables combined kinematic laser processing with fieldbus cycle times of 250 µs and galvo 2D repositioning time each 25 µs. This is achieved with own developed electronics and FIFO buffering of interpolated XY positions to achieve the desired trajectory within microseconds. This paper describes the analytical model used to achieve the combined motion as well as validation of motion and cutting velocities within the system. The experimental results show excellent process efficiency and high cut quality for several tested materials.As a conclusion, a high-speed motion system with coupled kinematics shows substantial advantages in laser materials processing thus revolutionizing manufacturing processes.

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Investigating double-scan strategies for reducing heat-affected zone in laser surface melting

Cited by 3 publications

References 45 publications

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Parameter optimization and anisotropy mechanism in different build directions of the microstructures and mechanical properties for laser directed energy deposited Ti6Al4V alloy

High-power laser material processing utilizing high-speed combined motion of scanner and linear axes system

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