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Technical Brief

METALLURGICAL AND MECHANICAL INVESTIGATIONS OF MICROWAVE PROCESSED HASTELLOY JOINTS

[+] Author and Article Information
Satnam Singh

Assistant Professor, Department of Mechanical Engineering, The Northcap University, Gurgaon-122017, Haryana, India
satnamsingh@ncuindia.edu

Rajveer Chaudhary

Research Scholar, Department of Mechanical Engineering, Thapar University, Patiala-147004, Punjab, India
rajveer.chaudhary@dsm-sinochem.com

Dheeraj Gupta

Assistant Professor, Department of Mechanical Engineering, Thapar University, Patiala-147004, Punjab, India
dheeraj.gupta@thapar.edu

Vivek Jain

Assistant Professor, Department of Mechanical Engineering, Thapar University, Patiala-147004, Punjab, India
vivek.jain@thapar.edu

1Corresponding author.

ASME doi:10.1115/1.4035370 History: Received September 02, 2016; Revised November 30, 2016

Abstract

In the present work, joining of Hastelloy has been successfully carried out by microwave hybrid heating process. The joints through microwave energy were developed by using a microwave oven at a frequency of 2.45 GHz and 900 W. A thin layer ( ~1mm) of slurry consisting of nickel based powder and epoxy resin was introduced between the faying surfaces. The joints obtained by microwave hybrid heating were characterized by XRD, SEM-EDS, Vicker's microhardness and tensile tests. Microstructure analysis reveals that the microwave processed joint exhibit equiaxed grains, and results of XRD analysis revealed formation of some intermetallics and suppression of carbides formation. This can be attributed to the volumetric heating nature of microwaves. The microhardness study revealed 320±25 HV hardness on grain surfaces and 680±40 HV on grain boundaries. The tensile strength of the microwave processed joints was ~82% of base Hastelloy strength. The fractographic analysis of the fractured samples revealed a ductile fracture coupled with the shearing of brittle carbides in the joints region. Overall study revealed the potential of microwaves in joining of bulk metallic materials.

Copyright (c) 2016 by ASME
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