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Tensile properties of laser additive manufactured Inconel 718 using filler wire

Published online by Cambridge University Press:  19 August 2014

Yi-Nan Zhang ,
Xinjin Cao ,
Priti Wanjara  and
Mamoun Medraj
Yi-Nan Zhang
Affiliation:
National Research Council Canada – Aerospace, Montreal, Quebec H3T 2B2, Canada Department of Mechanical Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
Xinjin Cao*
Affiliation:
National Research Council Canada – Aerospace, Montreal, Quebec H3T 2B2, Canada
Priti Wanjara
Affiliation:
National Research Council Canada – Aerospace, Montreal, Quebec H3T 2B2, Canada
Mamoun Medraj
Affiliation:
Department of Mechanical Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
*
a)Address all correspondence to this author. e-mail: Xinjin.Cao@cnrc-nrc.gc.ca
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Abstract

A 5 kW continuous wave fiber laser welding system was used to deposit INCONEL® alloy 718 (IN718) on service-exposed IN718 parent metal (PM) substrates using filler wire addition. The microstructure of the deposits was characterized in the fully heat treated condition. The service-exposed IN718 PM and the direct laser deposited (DLD) specimens were then evaluated through room temperature tensile testing. The yield and tensile strengths were well above the minimum values, as defined in the aerospace specifications AMS 5596K and 5663M. However, the ductility at room temperature of the DLD and DLD-PM samples was slightly lower than that specified in AMS 5596K and 5663M. The tensile fracture surfaces of the service-exposed IN718 PM, DLD, and DLD-PM specimens were analyzed using scanning electron microscopy (SEM), and the tensile failure mechanisms are discussed in detail, particularly for the important roles of the secondary particles (MC carbides) and intermetallics (platelet Ni3Nb-δ and Laves phases).

Keywords

fracturelaserSEM
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 2006 - 2020
Copyright
Copyright © Materials Research Society 2014 

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References

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