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Technical Brief

Preliminary 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, Haryana 122017, India
e-mail: satnamsingh@ncuindia.edu

Rajveer Singh

Department of Mechanical Engineering,
Thapar University,
Patiala, Punjab 147004, India
e-mail: rajveer.chaudhary@dsm-sinochem.com

Dheeraj Gupta

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

Vivek Jain

Assistant Professor
Department of Mechanical Engineering,
Thapar University,
Patiala, Punjab 147004, India
e-mail: Vivek.jain@thapar.edu

1Corresponding author.

Manuscript received September 2, 2016; final manuscript received November 30, 2016; published online January 30, 2017. Assoc. Editor: Wayne Cai.

J. Manuf. Sci. Eng 139(6), 064503 (Jan 30, 2017) (5 pages) Paper No: MANU-16-1481; doi: 10.1115/1.4035370 History: Received September 02, 2016; Revised November 30, 2016

In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating process. The joints were developed by using a microwave oven at a frequency of 2.45 GHz and 900 W. A thin layer 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 revealed the formation of equiaxed grains, and results of XRD analysis revealed formation of some intermetallics and suppression of carbide 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 joint region. An overall study revealed the potential of microwaves in joining of bulk metallic materials.

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Copyright © 2017 by ASME
Topics: Microwaves , Joining , Heating
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Figures

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Fig. 1

(a) Typical SEM image and (b) typical XRD spectrum of EWAC powder

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Fig. 2

(a) Schematic of microwave hybrid heating process, (b) flow chart showing a process of microwave joining, (c) standard tensile specimen, and (d) macrograph showing the microwave processed joint zone

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Fig. 3

(a) XRD spectrum of microwave processed Hastelloy joint and (b) SEM image showing the cellular grain structure in joint region

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Fig. 4

(a) EDS analysis on grain surface and grain boundary and (b) SEM image showing the fractured joint region

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