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Open AccessArticle

Analysis of Melt-Pool Behaviors during Selective Laser Melting of AISI 304 Stainless-Steel Composites

1
School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
2
Department of Mechanical Engineering, University of Birjand, Birjand 97175-376, Iran
3
School of Material Science and Engineering, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 876; https://doi.org/10.3390/met9080876
Received: 29 June 2019 / Revised: 20 July 2019 / Accepted: 6 August 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Numerical Modelling and Simulation of Metal Processing)
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Abstract

The melt-pool behaviors during selective laser melting (SLM) of Al2O3-reinforced and a eutectic mixture of Al2O3-ZrO2-reinforced AISI 304 stainless-steel composites were numerically analyzed and experimentally validated. The thermal analysis results show that the geometry of the melt pool is significantly dependent on reinforcing particles, owing to the variations in the melting point and the thermal conductivity of the powder mixture. With the use of a eutectic mixture of Al2O3-ZrO2 instead of an Al2O3 reinforcing particle, the maximum temperature of the melt pool was increased. Meanwhile, a negligible corresponding relationship was observed between the cooling rate of both reinforcements. Therefore, it was identified that the liquid lifetime of the melt pool has the effect on the melting behavior, rather than the cooling rate, and the liquid lifetime increases with the eutectic ratio of Al2O3-ZrO2 reinforcement. The temperature gradient at the top surface reduces with the use of an Al2O3-ZrO2 reinforcement particle due to the wider melt pool. Inversely, the temperature gradient in the thickness direction increases with the use of an Al2O3-ZrO2 reinforcement particle. The results of melt-pool behaviors will provide a deep understanding of the effect of reinforcing particles on the dimensional accuracies and properties of fabricated AISI 304 stainless-steel composites. View Full-Text
Keywords: selective laser melting; additive manufacturing; SLM; FEM; Al2O3; reinforced; Al2O3-ZrO2; 304; stainless; composite selective laser melting; additive manufacturing; SLM; FEM; Al2O3; reinforced; Al2O3-ZrO2; 304; stainless; composite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Abolhasani, D.; Seyedkashi, S.M.H.; Kang, N.; Kim, Y.J.; Woo, Y.Y.; Moon, Y.H. Analysis of Melt-Pool Behaviors during Selective Laser Melting of AISI 304 Stainless-Steel Composites. Metals 2019, 9, 876.

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