Characterization of TiC Precipitated Phase in Solidification Structure of High Titanium Wear-resistant Steel

    
    High titanium wear-resistant steel is widely used in aerospace, automobile and other fields because of its excellent wear resistance and corrosion resistance. It mainly contains rare titanium boron and titanium carbide. In this article, the research progress of titanium carbide in solidification structure of high titanium wear-resistant steel is summarized and the application of microstructure in solidification structure of high titanium wear-resistant steel is discussed.
    
    1 Introduction
    
    High titanium wear-resistant steel contains boron and carbide, the main component of which is titanium carbide. In recent years, the research of solidification structure of high titanium wear-resistant steel has been basically deepened, and various research directions have similar results. Among them, the formation of TiC precipitated phase in the solidification structure of high titanium wear-resistant steel is a key factor affecting the service life and performance of steel.
    
    2 Formation of TiC Precipitated Phase
    
    The formation of titanium carbide precipitated phase in the solidification structure mainly depends on the addition of titanium-boron alloy and the microstructure of steel. In hot-dip galvanizing and other processes, titanium-boron alloy is added to the molten steel of the bath, and it is mainly derived from the reaction of titanium-boron alloy with other components of molten steel to form the precipitated phase.
    
    In addition, the reaction of TiC precipitated phase is affected by the welding current, heat and other parameters. The heat treatment process also affects the weakening and strengthening of the solidification structure, which further affects the formation of TiC precipitated phase.
    
    Figure 1: Microstructure of High Titanium Wear-resistant Steel.
    
    3 Microstructure of High Titanium Wear-Resistant Steel
    
    The microstructure of high titanium wear-resistant steel mainly includes three parts: parent phase, precipitated phase and grain boundary phase (Figure 1). The parent phase consists of austenite, ferrite and pearlite, and the grain boundary phase includes oxide and oxide inclusion. In addition, the precipitated phase mainly includes titanium carbide and boron nitride.
    
    Titanium carbide is the main component in high titanium wear-resistant steel. It has strong hardness, wear resistance and corrosion resistance, which can improve the lifetime of the steel parts. In detail, titanium carbide has the following properties:
    
    • Titanium carbide has a high melting point and a low thermal expansion coefficient.
    
    • Titanium carbide is insoluble in water and has excellent corrosion resistance.
    
    • Titanium carbide has strong strength and hardness, and can improve the wear resistance of high titanium wear-resistant steel.
    
    • Titanium carbide can also reduce the weight of steel parts, and improve the overall efficiency of steel.
    
    4 Application in Solidification Structure
    
    The precipitation of titanium carbide in high titanium wear-resistant steel can not only improve the service life and performance of steel, but also reduce its weight in parts application. In addition, the fine particle size of titanium carbide can reduce the impact toughness of high titanium wear-resistant steel, thus effectively improving its resistance to micro-noise and making it more suitable for applications under extreme working conditions.
    
    In the manufacture of high-strength bolts, the titanium carbide precipitated phase can also form carbide lamination in the matrix of the high-strength bolt. This carbide laminated structure can greatly improve the shear strength, thermal strength, fatigue strength and wear resistance of the bolt.
    
    In addition, the titanium carbide precipitated phase can also be used to refine grains, which can reduce the micro-porosity, mitigate the impact strength of high-strength bolts, and improve the corrosion resistance.
    
    5 Conclusion
    
    In summary, titanium carbide precipitated phase plays a very important role in solidification structure of high titanium wear-resistant steel. It not only improves the service life and performance of high titanium wear-resistant steel, but also has a great influence on the production and application of products. Therefore, it is necessary to further research and investigate its formation mechanism, structure and application in wear-resistant steel.

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