About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Additive Manufacturing of Shape Memory NiTi Alloys with High Building Rates |
Author(s) |
Jianing Zhu, Evgenii Borisov, Eduard Farber, Marcel Hermans, Vera Popovich |
On-Site Speaker (Planned) |
Jianing Zhu |
Abstract Scope |
Improving the productivity of Laser Powder Bed Fusion (L-PBF) received a lot of attention in recent years, which can contribute to manufacturing large-scale parts and saving time. The increased laser power improves L-PBF’s building rate, while also increases the risk for the formation of keyhole-induced pores. In this work, we adopt a strategy of coupling the high laser power (950 W) with a large beam size, enabled by implementing laser defocusing, to improve building rates and prevent from defect formation. Processing parameters were optimized based on the processing maps developed from analytical models predicting melt pool dimensions and defect formation criteria. Finally, the high-quality NiTi parts were fabricated with a 240% increase in productivity compared with a relatively low laser power (250 W) and a small beam size. |