Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting

By Wenhui Yu, Swee Leong Sing, C. K. Chua, Xue-feng Tian. Journal of Alloys and Compounds, 2019

268 citations recorded by the source corpus.

Abstract Re-melting strategies with same and opposite directions to the first scanning routine were performed in AlSi10Mg parts by selective laser melting (SLM) technology. Surface roughness and porosity were investigated with confocal microscopy, micro-computed tomography (CT) and optical microscopy (OM). Re-melting facilitates the top surface finish with Ra value decreasing from 20.67 μm to 11.67 μm (same direction) and 10.87 μm (opposite direction), almost at the same level. On side surface there is a contradictory trend. Pores at SLM parts include spherical pores due to entrapped gases, irregular pores for lack of fusion, and keyhole pores because of laser movement. The former two kinds form in the central areas while the latter one is located at edges of melting tracks and exhibits different distribution at both sides. Re-melting allows more chances for pores (spherical and keyhole pores) to escape from the melting pools. Irregular pores decrease because smoother surface allows powders to be fully melted. Porosity decrease of both re-melting strategies in central areas of the SLM parts is almost on the same level while same directional re-melting exhibits superior ability to release porosity at edges because of the porosity distribution difference at the head and wake of the melting tracks.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/fbcc0c9f35f764f86200cf36ed6bd3ea6b190761

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Automotive Engineering

1. A. Nagalingam
2. Swee Hock Yeo
3. Chao Wei
4. Zhizhou Zhang
5. Lin Li
6. Jian-Yuan Lee
7. A. Pinkerton

In Mechanical Engineering

1. Chao Wei
2. Swee Hock Yeo
3. Zhizhou Zhang
4. A. Nagalingam
5. Lin Li
6. Zhe Sun
7. Jian-Yuan Lee
8. A. Pinkerton

Citations in the corpus

• A review on the state-of-the-art of surface finishing processes and related ISO/ASTM standards for metal additive manufactured components (2020, background): “Yes (Yu et al. 2019) Yes = Reported in the literature; N.A. = No available papers in literature.”
• An overview of laser-based multiple metallic material additive manufacturing: from macro- to micro-scales (2020, background): “Yu et al reveal that re-melting can improve the surface roughness and porosity [73].”