Abstract: Taking TiCNp and 20Cr high chromium cast iron powder as raw materials, reinforced high chromium cast iron with 10wt%—30wt% TiCNp in this work was fabricated by supersolidus liquid phase sintering (SLPS) method. The influence of TiCNp addition amount and sintering temperature on its densification, constituent phase, microstructure and mechanical properties have been investigated systematically. The results show that the relative density of the TiCNp sintered through SLPS technique could reach to 97.5%, and it's phase composition containing TiCN, Cr7C3 carbides, martensite and a small amount of austenite. Besides, with the increment of TiCNp addition amount, TiCNp gradually forming a net distribution along the grain boundary. Meanwhile, more and more Cr7C3 carbides were precipitated and coarsened in the unmelted alloy matrix, which could lead to the linearly increment of the hardness of the TiCNP but decreases their bending strength and impact toughness. And in general it is worth noting that the sintered composite with 30wt% TiCNp has great mechanical properties with hardness of 87.8HRA, bending strength of 1 304 MPa and impact toughness of 2.35 J/cm2.
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2023, Vol. 37 
