Analysis on interface wettability between TiC and steel

WANG Qiang-qiang; CAI Zi-jie; SUN Pan; LIU Xiao-hua

doi:10.13228/j.boyuan.issn0449-749x.20220128

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Iron and Steel ›› 2022, Vol. 57 ›› Issue (9) : 75-81. DOI: 10.13228/j.boyuan.issn0449-749x.20220128

Steelmaking

Analysis on interface wettability between TiC and steel

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Abstract

TiC particle has characteristics of high hardness, high melting point, high thermodynamic stability and so on. As the reinforcing phase, TiC has the potential to improve the strength, high temperature resistance and wear resistance of steel matrix. In recent years, much attention has been paid to the development of related steel grades. Good wettability between reinforcing phase and steel matrix is the key to improve interfacial bonding strength and prevent particles from falling off during the steel wear service. To clarify the wettability between steel and TiC and guide the development of wear-resistant steel with TiC as the reinforcing phase, the spreading behavior of steel droplets on TiC substrate was observed by sessile drop method, the element distribution of micro-area between steel and TiC was analyzed by electron probe microanalysis, and the wetting behavior at high temperature was explored with the aid of thermodynamic calculation. Results shows that the wettability between steel and TiC is pretty good, as the molten steel can quickly penetrate into the TiC substrate through the micropores during heating and insulation process. The steel sample collapses and disappears from the observation window. During the penetration, N element can diffuse to the surrounding. No new phase is generated at the interface between molten steel and TiC particles. The predicted binary phase diagram indicates that TiC has a higher solubility in liquid steel than that of TiN, confirming the better wettability of TiC-steel system than that of TiN-steel system. The interface wettability between molten steel and TiC particles is good and there is no chemical reaction at the interface, which ensures that TiC particles can be used as reinforcing phase to improve the wear resistance of steel. The result can provide a guidance for the wettability study between TiC particles and high-titanium steel, and the composition design of high-titanium wear-resistant steel.

Key words

steel / TiC / wettability / sessile drop method / wear resistance

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WANG Qiang-qiang, CAI Zi-jie, SUN Pan, et al. Analysis on interface wettability between TiC and steel[J]. Iron and Steel, 2022, 57(9): 75-81 https://doi.org/10.13228/j.boyuan.issn0449-749x.20220128

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