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22 March 2021 Toward mitigating microcracks using nanopowders in laser powder bed fusion
Bharath Bhushan Ravichander, Amirhesam Amerinatanzi, Narges Shayesteh Moghaddam
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Proceedings Volume 11589, Behavior and Mechanics of Multifunctional Materials XV; 115890P (2021) https://doi.org/10.1117/12.2585606
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only
Abstract
Selective laser melting (SLM) is an additive manufacturing (AM) process capable of fabricating parts of intricate shapes and sizes by melting layers of metal powder with high accuracy. Nickel–Titanium (NiTi) is a shape memory alloy with superelastic characteristics which is of great interest to modern industries. The conventional fabrication of NiTi is limited due the poor machinability of NiTi. Thus, modern manufacturing techniques like SLM enables the fabrication of complex NiTi specimens to suit its application. Nevertheless, microstructural defects such as porosities and microcracks often lead to decreased ductility in SLM fabricated NiTi specimens. In this study, a new technique is used in order to deposit nano metal powders over already formed microcracks, followed by their melting, in order to reduce these microstructural defects. The as-fabricated additive manufactured NiTi sample with the novel nanoparticle dispersion technique exhibited a reduction of 98% in crack density.
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Bharath Bhushan Ravichander, Amirhesam Amerinatanzi, and Narges Shayesteh Moghaddam "Toward mitigating microcracks using nanopowders in laser powder bed fusion", Proc. SPIE 11589, Behavior and Mechanics of Multifunctional Materials XV, 115890P (22 March 2021); https://doi.org/10.1117/12.2585606
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KEYWORDS
Spatial light modulators
Additive manufacturing
Particles
Metals
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