A1 Journal article (refereed), original research

Effects of TIG welding process on microstructure, electrical resistance and mechanical properties of Nichrome 8020


Open Access publication

Publication Details
Authors: Afkhami Shahriar, Ayub Halvaee
Publisher: R&d Print Vydavatelstvo Vedeckej a Odbornej
Publication year: 2016
Language: English
Related Journal or Series Information: Kovove Materialy
Volume number: 54
Issue number: 4
Start page: 289
End page: 296
Number of pages: 8
ISSN: 0023-432X
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract

This study investigates effects of TIG
welding and welding heat input on microstructure, hardness, tensile
strength, fracture mechanism, and electrical resistance of Nichrome 8020
to evaluate its efficiency after welding, especially as a heating
element. The post-weld microstructure of the alloy remained austenitic.
The microstructure of fusion zone consisted of columnar dendrites,
equiaxed dendrites, and intermetallic carbonitrides. These precipitates
nucleated and grew among subgrain boundaries. Because of grain growth,
hardness and tensile strength decreased after welding, and by
increasing welding heat input, these mechanical properties decreased
more severely. Fractography analysis showed that fracture surfaces of
all the welded samples included both brittle and ductile features.
Despite grain growth, which occurred as a result of the welding
process, the electrical resistance of Nichrome 8020 increased slightly
after welding. No signs of welding cracks and topologically
close-packed phases were observed in the heat affected zone and fusion
zone of any sample


Last updated on 2019-26-09 at 13:27