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• W4220839971 abstract "A quasi-continuous-wave direct metal deposition (QCW-DMD), one of directed energy deposition (DED), with different pulse frequencies and duty cycles was performed on an inclined NV E690 steel plate. Comprehensive effects including the humping effect, the melt pool evolution process, the coalescence phenomenon, the deposition morphology, and the thermal behavior were investigated. The results show that during the continuous-wave direct metal deposition (CW-DMD) and the QCW-DMD with the pulse frequency of 1 Hz, the gravity-induced humping effect and the coalescence phenomenon contribute to the increase and decrease of the melt pool numbers, respectively. A small duty cycle leads to a decrease in the average melt pool numbers. Besides, the coalescence of melt pools is formed by establishing a liquid bridge which is first mainly driven by the surface tension and then by gravity. The humping effect is overcome when the pulse frequency ranges from 5 Hz to 50 Hz, presenting a small height variation. Furthermore, the QCW mode laser can modulate the powder catchment efficiency and produce a higher cooling rate that resulted in a higher microhardness . • Quasi-continuous-wave (QCW) mode laser can prevent the gravity-induced humping effect. • QCW mode laser parameters affect the deposition morphology and the powder catchment efficiency. • The melt pool is constrained by its surface tension on an inclined substrate to resist its gravity. • The coalescence of melt pools is formed by establishing a liquid bridge which is first mainly driven by the surface tension and then gravity. • QCW mode laser can produce a higher cooling rate that results in a higher microhardness in the deposition." @default.
• W4220839971 created "2022-04-03" @default.
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• W4220839971 date "2022-05-01" @default.
• W4220839971 modified "2023-10-16" @default.
• W4220839971 title "Quasi-continuous-wave laser directed energy deposition on inclined NV E690 steel plates: Melt pool and temperature evolution" @default.
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• W4220839971 doi "https://doi.org/10.1016/j.surfcoat.2022.128344" @default.
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