Journal
OPTICS AND LASER TECHNOLOGY
Volume 99, Issue -, Pages 91-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2017.08.015
Keywords
Additive manufacturing; Selective laser melting; Scan strategy; Molten pool boundary; Tensile behavior
Categories
Funding
- NSFC-DFG Sino-German Research Project [GZ 1217]
- National Natural Science Foundation of China [51575267]
- National Key Research and Development Program Additive Manufacturing and Laser Manufacturing [2016YEB1100101]
- Key Research and Development Program of Jiangsu Provincial Department of Science and Technology of China [BE2016181]
- 333 Project [BRA2015368]
- Aeronautical Science Foundation of China [2015ZE52051]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Funding for Outstanding Doctoral Dissertation in NUAA [BCXJ15-08]
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Selective laser melting additive manufacturing of the AlSi12 material parts through the re-melting of the previously solidified layer using the continuous two layers 90 rotate scan strategy was conducted. The influence of the re-melting behavior and scan strategy on the formation of the track-track and layer-layer molten pool boundaries (MPBs), dimensional accuracy, microstructure feature, tensile properties, microscopic sliding behavior and the fracture mechanism as loaded a tensile force has been studied. It showed that the defects, such as the part distortion, delamination and cracks, were significantly eliminated with the deformation rate less than 1%. The microstructure of a homogeneous distribution of the Si phase, no apparent grain orientation on both sides of the MPBs, was produced in the as-fabricated part, promoting the efficient transition of the load stress. Cracks preferentially initiate at the track-track MPBs when the tensile stress increases to a certain value, resulting in the formation of the cleavage steps along the tensile loading direction. The cracks propagate along thelayer-layer MPBs, generating the fine dimples. The mechanical behavior of the SLM-processed AlSi12 parts can be significantly enhanced with the ultimate tensile strength, yield strength and elongation of 476.3 MPa, 315.5 MPa and 6.7%, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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