Effect of Heat Treatment on the Corrosion Behavior of Weld-Deposited Chromium Carbide-Based Hardfacing Alloys

Cedric Tan; Kannoorpatti Krishnan; Naveen Elumalai

doi:10.3390/met14121436

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Effect of Heat Treatment on the Corrosion Behavior of Weld-Deposited Chromium Carbide-Based Hardfacing Alloys

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Effect of Heat Treatment on the Corrosion Behavior of Weld-Deposited Chromium Carbide-Based Hardfacing Alloys

Cedric Tan, Kannoorpatti Krishnan and Naveen Elumalai

Metals, Vol.14(12), pp.1-21

2024

DOI: https://doi.org/10.3390/met14121436

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Abstract

hardfacing

corrosion

white iron

carbides

heat treatment

chromium

The effects of heat treatment on the microstructure and corrosion behavior of chromium carbide-based hardfacing alloys deposited via gas metal arc welding were investigated. The hardfacing alloy, high chromium white iron (HCWI), containing 27 wt% Cr and 4.8 wt% C, was heat treated at 650 degrees C and 950 degrees C for six hours followed by natural cooling to room temperature. Microstructural characterization revealed that heat treatment promoted the transformation of austenite to ferrite and increased carbide precipitation. X-ray diffraction analysis identified the primary carbides as Cr7C3, which remained stable during heat treatment. Electrochemical corrosion testing in artificial seawater, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), demonstrated progressively improved corrosion resistance with heat treatment temperature. Both techniques confirmed that the specimen treated at 950 degrees C exhibited superior corrosion resistance compared to the 650 degrees C treatment and as-deposited condition, with the specimen treated at 950 degrees C exhibiting the highest charge transfer resistance (4711 Omega<middle dot>cm2) compared to the 650 degrees C treatment (2608 Omega<middle dot>cm2) and as-deposited condition (374.6 Omega<middle dot>cm2). The enhanced corrosion resistance was attributed to the increased carbide precipitation and optimization of the matrix composition. While heat treatment at both temperatures improved corrosion performance, the 950 degrees C treatment yielded superior results, suggesting this could be an optimal temperature for enhancing the corrosion resistance of chromium carbide-based hardfacing alloys.

Details

Title: Effect of Heat Treatment on the Corrosion Behavior of Weld-Deposited Chromium Carbide-Based Hardfacing Alloys
Authors: Cedric Tan - Charles Darwin University
Kannoorpatti Krishnan (Corresponding Author) - Charles Darwin University
Naveen Elumalai - Charles Darwin University
Publication details: Metals, Vol.14(12), pp.1-21
Publisher: MDPI AG
Date published: 2024
DOI: 10.3390/met14121436
ISSN: 2075-4701
Copyright note: © 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Data Availability: The original contributions presented in the study are included in the article material. Further inquiries can be directed to the corresponding author.
Grants: Australian Government Research Training Program (RTP) Scholarship, RTP, Department of Education (Australia, Canberra)
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 991216649502621
Output Type: Journal article

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