선택적 레이저 용융공정으로 제조된 Al-Si-Mg 합금의 열처리에 따른 미세조직 및 특성평가

이기승; 엄영성; 김경태; 김병기; 유지훈

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자료유형: 학술저널

저자정보: 이기승 엄영성 김경태 김병기 유지훈

저널정보: 한국분말야금학회 한국분말야금학회지 한국분말야금학회지 제26권 제2호

발행연도: 2019.1

수록면: 138 - 145 (8page)

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연구배경

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연구결과

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In this study, Al-Si-Mg alloys are additively manufactured using a selective laser melting (SLM) process from AlSi10Mg powders prepared from a gas-atomization process. The processing parameters such as laser scan speed and laser power are investigated for 3D printing of Al-Si-Mg alloys. The laser scan speeds vary from 100 to 2000 mm/ s at the laser power of 180 and 270W, respectively, to achieve optimized densification of the Al-Si-Mg alloy. It is observed that the relative density of the Al-Si-Mg alloy reaches a peak value of 99% at 1600 mm/s for 180W and at 2000 mm/s for 270W. The surface morphologies of the both Al-Si-Mg alloy samples at these conditions show significantly reduced porosities compared to those of other samples. The increase in hardness of as-built Al-Si-Mg alloy with increasing scan speed and laser power is analyzed due to high relative density. Furthermore, it was found that cooling conditions after the heat-treatment for homogenization results in the change of dispersion status of Si phases in the Al-Si matrix but also affects tensile behaviors of Al-Si-Mg alloys. These results indicate that combination between SLM processing parameters and post-heat treatment should be considered a key factor to achieve optimized Al-Si alloy performance.

참고문헌 (13)

참고문헌 신청

신기훈 / 2017 / 선택적 레이저 용융공정을 이용한 316L 스테인리스강 분말 3차원 조형체의 미세조직 및 경도 연구 / 한국분말야금학회지 24(3):210~215

A. Ambrosi / 2016 / Chem. Soc. Rev 45:2740

L. Thijs / 2010 / Acta Mater 58:3303

H. Attar / 2015 / Mater. Lett 142:38

J. Suryawanshi / 2016 / Acta Mater 115:285

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