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Characterization of microstructure and mechanical properties of Super Ni 718 alloy and AISI 316L dissimilar weldments

Published online by Cambridge University Press:  14 November 2014

P. Prabaharan ,
K. Devendranath Ramkumar  and
N. Arivazhagan
P. Prabaharan
Affiliation:
School of Mechanical and Building Sciences, VIT University, Vellore 632014, India
K. Devendranath Ramkumar*
Affiliation:
School of Mechanical and Building Sciences, VIT University, Vellore 632014, India
N. Arivazhagan
Affiliation:
School of Mechanical and Building Sciences, VIT University, Vellore 632014, India
*
a)Address all correspondence to this author. e-mail: deva@vit.ac.in
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Abstract

The present investigation addressed the weldability of Super Ni 718 alloy and AISI 316L using gas tungsten arc (GTA) welding process using three different filler wires, such as ER2594, ERNiCrMo-4 and ERNiCrCoMo-1. Interface microstructures showed the formation of secondary phases at the heat-affected zone (HAZ) of Super Ni 718 alloy and delta ferrite colonies at the HAZ of AISI 316L. It was witnessed from the weld microstructures that the deleterious phases were suppressed or controlled while using these filler wires for joining the bimetals. Tensile results corroborated that the failure occurred at the parent metal of AISI 316L in all the cases. The presence of microvoids and dimples characterized for the ductile mode of fracture in these weldments. Charpy V-notch test results showed that the weldments using ERNiCrMo-4 filler exhibited higher impact energy. A detailed study has been made to investigate the structure–property relationships of these weldments using optical and scanning electron microscopic techniques.

Keywords

Super Ni 718 alloyAISI 316Lmechanical propertiesdissimilar metal weldingmicrostructuresegregationscanning electron microscopy
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 24 , 28 December 2014 , pp. 3011 - 3023
Copyright
Copyright © Materials Research Society 2014 

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References

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