The direct laser-deposited Inconel 718 (IN718) specimens were produced using 1073 nm, high power continuous wave (CW), IPG Ytterbium fibre laser and in-situ heat treatment. The laser power and in-situ heat treatment temperature were fixed while varying the laser scanning speed from 0.83 to 2.50 cm/s. The microstructure and micro-hardness of the IN718 specimens were characterized using an optical microscope (OM), scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS or EDX) and Vickers system. The microstructure of the specimens consists of g-matrix as the primary phase, Nb-rich particles, constitutional liquation cave, liquation cracking and ductility-dip cracks. It was found that the micro-hardness profile of the IN718 specimens was gradually increased with the increase of the distance from the surface.
Reference:
Masina, B.N., Skhosane, B.S. and Tlotleng, M. 2020. Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties. MRS Advances, v5(23-24), pp 1245-1257.
Masina, B. N., Skhosane, B. S., & Tlotleng, M. (2020). Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties. http://hdl.handle.net/10204/11602
Masina, Bathusile N, Besabakhe S Skhosane, and Monnamme Tlotleng "Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties." (2020) http://hdl.handle.net/10204/11602
Masina BN, Skhosane BS, Tlotleng M. Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties. 2020; http://hdl.handle.net/10204/11602.
Copyright: 2020 Cambridge University Press. This is the abstract version of the work. For access to the fulltext, please visit the publisher's website.
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