Morphology and Distribution of M₇C₃ and TiC In Situ Synthesized in Plasma Surfacing

Abstract:

In order to systematically study the morphology and distribution of M₇C₃ and TiC which in situ synthesized by plasma arc in the surfacing layer, plasma arc was used to clad the Fe-Cr-Ti-C wear-resistant alloy on low-carbon steel. And high corrosion experiment was applied to the surfacing layer. The hardness, microstructure and phase constitution of the surfacing layer were investigated through the tests of hardness, OM, EDS, SEM and XRD analysis. The results shows that irregular hexagonal (Cross-section) and strip (Side) M₇C₃ and petal-like, granular TiC were in situ synthesized in the surfacing layer. The M₇C₃ and TiC was combined closely. The M₇C₃ grains which closed to the fusion line of the base metal and surfacing layer are fine, but the ones that away from the fusion line are larger caused by the large temperature gradient. Smooth metallurgical bonding layer was formed between the surfacing layer and the base metal, it has a good metallurgical bonding. The phenomenon that carbon diffusion into the base material was clearly, the hardness near the fusion zone was improved effectively.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 1752-1755
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.1752
• Online since: July 2012
• Authors: Yun Hai Su*, De Guang Wu, Guang Chao Liu
• Keywords: Ceramic Hard Phase, In Situ Synthesis, Morpholoy, Plasma Arc, Surfacing Layer

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