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Refinement and homogenization of M7C3 carbide in hypereutectic Fe-Cr-C coating by Y2O3 and TiC

Ren, XJ and Liu, S and Zhang, J and Wang, Z and Shi, Z and Zhou, Y and Yang, Q (2017) Refinement and homogenization of M7C3 carbide in hypereutectic Fe-Cr-C coating by Y2O3 and TiC. Materials Characterization, 132. pp. 41-45. ISSN 1044-5803

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Abstract

The microstructures of the hypereutectic Fe-Cr-C, Fe-Cr-C-Ti and Fe-Cr-C-Ti-Y2O3 coatings were observed by OM. The phase structures were characterized by XRD and XPS. The elemental distributions were analyzed by EDS. The interface relationship between TiC and nano-Y2O3 were observed by TEM and analyzed by lattice misfit theory. From the metallographic observations, the primary M7C3 carbide can be refined by Ti additive, while it is inhomogeneously distributed. However, the primary M7C3 carbide can also be refined further by adding Ti additive and nano-Y2O3 simultaneously, and it is homogeneously distributed. From the phase constituent analysis, TiC is formed by Ti additive, while TiC and Y2O3 are found by adding Ti additive and nano-Y2O3 simultaneously. From the elemental distribution mappings and TEM images, TiC nucleates upon nano-Y2O3 with orientation relationship {001}Y2O3//{001}TiC in the hypereutectic Fe-Cr-C-Ti-Y2O3 coating. By misfit computation, the lattice misfit between Y2O3 (001) plane and TiC (001) plane is 7.3%, which suggests that Y2O3 can act as the heterogeneous nucleus of TiC so that TiC particles are increased and dispersedly distributed. These numerous dispersed TiC particles can further act as the heterogeneous nucleus of the primary M7C3 carbide, which play a role in refining primary M7C3 carbide and promoting its homogenization.

Item Type: Article
Uncontrolled Keywords: 0912 Materials Engineering, 0913 Mechanical Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: Maritime and Mechanical Engineering
Publisher: Elsevier
Date Deposited: 16 Oct 2017 10:58
Last Modified: 16 Oct 2017 10:58
DOI or Identification number: 10.1016/j.matchar.2017.08.004
URI: http://researchonline.ljmu.ac.uk/id/eprint/7360

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