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Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties

Published online by Cambridge University Press:  20 April 2020

BN Masina ,
S Skhosane ,
S Hoosain  and
M Tlotleng Open the ORCID record for M Tlotleng [Opens in a new window]
BN Masina*
Affiliation:
Council for Scientific and Industrial Research, National Laser Centre, PO BOX 395, Pretoria, 0001, South Africa.
S Skhosane
Affiliation:
Council for Scientific and Industrial Research, National Laser Centre, PO BOX 395, Pretoria, 0001, South Africa.
S Hoosain
Affiliation:
Council for Scientific and Industrial Research, National Laser Centre, PO BOX 395, Pretoria, 0001, South Africa.
M Tlotleng
Affiliation:
Council for Scientific and Industrial Research, National Laser Centre, PO BOX 395, Pretoria, 0001, South Africa. University of Johannesburg, Faculty of Engineering and Built Environment, Auckland Park Campus, Johannesburg, 2012, South Africa.
*
*(Email: BMasina@csir.co.za)
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Abstract

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 γ-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.

Keywords

additive manufacturingalloyhardnessNbdefects
Type
Articles
Information
MRS Advances , Volume 5 , Issue 23-24: African Materials Research Society 2019 , 2020 , pp. 1245 - 1257
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Copyright
Copyright © Materials Research Society 2020

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