Large anomalous features in the microstructure of chromium carbide weld overlays

ABSTRACT

This paper discusses the existence of large () anomalous features observed in the microstructure of chromium carbide weld overlays. Microhardness testing (Vickers), Auger electron spectroscopy, electron backscatter diffraction, and energy dispersive x-ray spectroscopy were employed to identify the origin, composition, and phase of the large anomalous features. Analysis of the results revealed the large anomalous features are unmelted powder granules with a different composition of the orthorhombic M₇C₃ phase of the primary carbides.

KEYWORDS:

• Chromium carbide overlays
• large anomalous features
• characterisation of chromium carbide overlays

Acknowledgements

The authors would like to thank Wilkinson Steel and Metal for providing funding, samples, and their technical expertise, Yiyu Wang for EBSD analysis and Lincoln Electric for the welding equipment and consumables. This research was funded in part by NSERC and the AWS Foundation.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Steven Borle http://orcid.org/0000-0001-8050-4927