Melt-pool motion, temperature variation and dendritic morphology of Inconel 718 during pulsed- and continuous-wave laser additive manufacturing: A comparative study

Li, Simeng; Xiao, Hui; Liu, Keyang; Xiao, Wenjia; Li, Yanqin; Han, Xu; Mazumder, Jyoti; Song, Lijun

doi:10.1016/j.matdes.2017.01.065

Cited by 149 publications

(43 citation statements)

References 28 publications

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“…During LAM, a two-color pyrometer was used to record the temperature of the molten pool in a noncontact way. The detailed setup parameters can be found in our previous works [4,34].…”

Section: Methodsmentioning

confidence: 99%

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Song

Xie

et al. 2020

Materials

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Refining microstructure is an important issue for laser additive manufacturing (LAM) of titanium alloy. In the present work, the microstructures of LAM-fabricated Ti6Al4V alloy were refined using a low energy density with the combination of a small spot diameter, a low laser power, and a high scanning speed. The microstructure, hardness, wear performance, and molten pool thermal behavior of LAM-fabricated Ti6Al4V coatings were studied. The results show that the grain sizes of both prior β and α phases are strongly dependent on the cooling rate of the molten pool. The fine prior β grains and submicron-scale acicular α phases were obtained under a low energy density of 75 J mm−2 due to the high cooling rate of the molten pool. In addition, the as-fabricated Ti6Al4V sample with submicron-scale acicular α phase showed a very high hardness of 7.43 GPa, a high elastic modulus of 133.6 GPa, and a low coefficient of friction of 0.48. This work provides a good method for improving the microstructure and mechanical performance of LAM-fabricated Ti6Al4V alloy.

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“…During LAM, a two-color pyrometer was used to record the temperature of the molten pool in a noncontact way. The detailed setup parameters can be found in our previous works [4,34].…”

Section: Methodsmentioning

confidence: 99%

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Song

Xie

et al. 2020

Materials

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“…High crystallographic texture [1][2][3], columnar grain structure [4][5][6] and intergranular defects [7] are common due to epitaxial growth. The alloy's use is also limited by high residual stresses [8,9] suboptimal aging [10] and anisotropic mechanical properties [11][12][13][14][15]. Efforts are being made to mitigate these problems with varied levels of success.…”

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confidence: 99%

Mechanical property heterogeneity in additively manufactured nickel superalloy

Forsey

Das

Simm

et al. 2018

Materials Science and Engineering: A

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“…Width modulated laser pulse generates different size and dynamics of melt pool and microstructures compared to CW lasers owing to the pulsed energy injection. There is a comparative study between PWM and CW lasers for direct laser metal deposition processes (DLMD) [43]. According to the study, PWM creates a beat-like motion of the melt pool according to the pulse duration and presents a rapid cooling rate.…”

Section: Pwm Melt Pool Dimensionmentioning

confidence: 99%

A Review: Melt Pool Analysis for Selective Laser Melting with Continuous Wave and Pulse Width Modulated Lasers

Kim

Yun

et al. 2018

Appl. Sci. Converg. Technol.

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Selective laser melting (SLM) is a promising additive manufacturing technique applied to various areas such as aerospace and biomedical industries. Because product characteristics can be controlled by SLM process parameters, several investigations have been conducted to clarify the relationship between process parameters and product characteristics. Melt pool, controlled by process parameters, is a suitable resource to determine the product profile accuracy and mechanical property. Two laser types, continuous wave (CW) and pulse width modulation (PWM), are typically used in SLM processes, and each has distinct advantages depending on the purpose of the process. While CW maintains its power constant, PWM presents a repeated pattern with a pulse width. Herein, the main differences in the process parameters between the two laser types and their effects on the melt pool formation during the SLM process are explained. The results demonstrate that CW and PWM are favorable for dense and fine structures, respectively.

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Melt-pool motion, temperature variation and dendritic morphology of Inconel 718 during pulsed- and continuous-wave laser additive manufacturing: A comparative study

Cited by 149 publications

References 28 publications

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Mechanical property heterogeneity in additively manufactured nickel superalloy

A Review: Melt Pool Analysis for Selective Laser Melting with Continuous Wave and Pulse Width Modulated Lasers

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