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doi:https://doi.org/10.5781/JWJ.2019.37.3.10    [Epub ahead of print]
The Effects of Heat Treatment Temperature on Wear Characteristics of Hyper-Eutectic Al-Si Alloy Laser Clad Layer
Hyoung-Keun Lee*
*Department of Advanced Materials Engineering, HanBat National University, Daejeon 305-719, Korea
Correspondence: Hyoung-Keun Lee  Email: leehk@hanbat.ac.kr
Received April 18, 2019  Accepted June 5, 2019  Published online June 10, 2019
ABSTRACT
In this study, it was tried to analyze the effects of heat treatment temperature on the microstructure and wear characteristics of the hyper-eutectic Al-Si clad layer. The clad layer was produced by scanning pulsed Nd:YAG laser beam over the Si powder layer printed on the Al050 Al alloy base metal. The chemical composition of the clad layer was analyzed to be Al-20.8%Si. Despite the hyper-eutectic Al-Si composition, the clad layer mainly consisted of the very fine Al-Si eutectic microstructure without primary Si particles. The clad layers were heat-treated at 300 ℃, 400 ℃ and 500 ℃ for 5 hours. The specimen heat-treated at 300 ℃ retained the very fine Al-Si eutectic microstructure, but the continuity of Si particles in the Si network was broken. In the specimen heat-treated at 400 ℃, the Al-Si eutectic microstructure disappeared and fine Si particles were dispersed over the entire area. In the specimen heat-treated at 500 ℃, the melt-solidification traces disappeared and Si particles were grown considerably. The wear weight loss was the lowest in the as-cladded specimen and increased with the increase of heat-treatment temperature. Adhesive wear did not occur in the specimens as-cladded and heat-treated at 300 ℃, but occurred in the specimens heat-treated at 400 ℃ and 500 ℃. The very fine Si networks in the Al-Si eutectic microstructure seemed to prevent adhesion of Al substrate to SKD 11 roll surface. Therefore, it was considered that there was no adhesive wear in the specimens which were as-cladded and heat-treated at 300 ℃.
Keywords: Laser cladding | Hyper-eutectic Al-Si Alloy | Heat treatment | Block-on-Roll Wear Test | Friction coefficient | Adhesive and abrasive wear
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