Journal
POWDER TECHNOLOGY
Volume 367, Issue -, Pages 597-607Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2020.04.027
Keywords
Selective laser melting; TiB2 tracks; Processing parameter; Cross-sectional feature; Surface morphology; FEA simulations
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Funding
- National Natural Science Foundation of China [51735005]
- National Key Research and Development Program [2016YFB1100101, 2018YFB1106302]
- National Natural Science Foundation of China for Creative Research Groups [51921003]
- Jiangsu Provincial Department of Human Resources and Social Security of China [TD-GDZB-001]
- Jiangsu Provincial Department of Education of China
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Multi-material selective laser melting (SLM) is a new development direction in additive manufacturing technologies to realize the incorporation of different materials within a single component. In this work, processing parameters, cross-sectional features and surface morphologies of TiB2 tracks on SLM-processed Ti6Al4V alloy layer were investigated. A processing window was determined by examining the type of molten pools and continuity of scanned tracks. Formation mechanism of microstructures at the cross-sections of TiB2 tracks was also discovered. At a high scan speed above 700 mm/s, the tracks all exhibited an unstable surface consisting of excessive shrinkage, spatters and cracks. Consequently, based on the experimental analysis and numerical simulations, a range of laser energy density from 0.67 J/mm to 1.50 J/mm at laser powers of 400-450 W was found to be a feasible scope of processing parameters to fabricate stable tracks of TiB2 on Ti6Al4V alloy by SLM. (C) 2020 Elsevier B.V. All rights reserved.
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