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Growth characteristics of primary M7C3 carbide in hypereutectic Fe-Cr-C alloy

Liu, S and Zhou, Y and Xing, X and Wang, J and Ren, X and Yang, Q (2016) Growth characteristics of primary M7C3 carbide in hypereutectic Fe-Cr-C alloy. SCIENTIFIC REPORTS, 6. ISSN 2045-2322

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Abstract

The microstructure of the hypereutectic Fe-Cr-C alloy is observed by optical microscopy (OM). The initial growth morphology, the crystallographic structure, the semi-molten morphology and the stacking faults of the primary M7C3 carbide are observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The in-suit growth process of the primary M7C3 carbide was observed by confocal laser microscope (CLM). It is found that the primary M7C3 carbide in hypereutectic Fe-Cr-C alloy is irregular polygonal shape with several hollows in the center and gaps on the edge. Some primary M7C3 carbides are formed by layers of shell or/and consist of multiple parts. In the initial growth period, the primary M7C3 carbide forms protrusion parallel to {0110} crystal planes. The extending and revolving protrusion forms the carbide shell. The electron backscattered diffraction (EBSD) maps show that the primary M7C3 carbide consists of multiple parts. The semi-molten M7C3 carbide contains unmelted shell and several small-scale carbides inside, which further proves that the primary M7C3 carbide is not an overall block. It is believed that the coalescence of the primary M7C3 carbides is ascribed to the growing condition of the protrusion and the gap filling process.

Item Type: Article
Additional Information: Article published in Scientific Reports and can be found at: http://dx.doi.org/10.1038/srep32941
Uncontrolled Keywords: Science & Technology; Multidisciplinary Sciences; Science & Technology - Other Topics; CHROMIUM CAST IRONS; MECHANICAL-PROPERTIES; ELEVATED-TEMPERATURE; STACKING-FAULT; MICROSTRUCTURE; WEAR; RESISTANCE; CORROSION; COATINGS
Subjects: T Technology > TP Chemical technology
Divisions: Maritime and Mechanical Engineering
Publisher: NATURE PUBLISHING GROUP
Related URLs:
Date Deposited: 06 Oct 2016 09:28
Last Modified: 07 Sep 2017 14:21
DOI or Identification number: 10.1038/srep32941
URI: http://researchonline.ljmu.ac.uk/id/eprint/4258

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