Porosity Defects Suppression in Narrow V-Groove Laser Remanufacturing Zone Through Electromagnetic Composite Field

Liang, 王梁 Wang; Hongchao, 夏洪超 Xia; Yong, 胡勇 Hu; Jian, 罗建 Luo; Fanliang, 澹台凡亮 Tantai; Jianhua, 姚建华 Yao

doi:10.3788/cjl202047.0602003

Cited by 2 publications

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“…However, the component often suffers wearout failure caused by machining damage and complex service environment, resulting in higher economic cost [4,5]. Hence, several methods were introduced to repair the complex components, such as laser shock peening, ultrasonic shot peening, and laser additive manufacturing, which eventually would increase the service life of the component [6][7][8][9][10]. During LAM, non-equilibrium solidification of the molten pool under high-energy laser irradiation would lead to the constitutional undercooling.…”

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confidence: 99%

Effect of Pulse Frequency on Microstructure, Friction and Wear Properties of Inconel 718 Coatings Prepared via Laser Cladding

Wang

et al. 2023

Crystals

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The Inconel 718 alloy clad coating was successfully prepared via pulsed laser deposition. The effect of pulse frequency on the evolution of microstructure, hardness and tribological properties of the as-deposited samples were analyzed via scanning electron microscopy (SEM), microhardness tester and ball-on-plate tribometer. The results showed that with the decrease in pulse frequency, the cooling rate of molten pool increases gradually, which effectively refines the γ-(Ni, Cr, and Fe) dendrites and restrains Nb segregation. Hence, the morphology of the brittle Laves phase changed from long chained to granular and its volume fraction decreased from 6.59% to 2.41%. The hardness of the coating increased from 261 HV0.1 to 297 HV0.1 and the tribological property also improved simultaneously. The friction coefficient decreased from 0.2387 to 0.2066, and the wear rate decreased from 27.30 × 10−4 mg·N−1·m−1 to 19.15 × 10−4 mg·N−1·m−1. It can also be observed that the wear area of the counterpart, Si3N4 ball, increased from 2.016 mm2 to 2.662 mm2. The increase in the hardness and tribological property were attributed to the grain refining strengthening.

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