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Hierarchical carbide-boride architectures in novel wear-resistant cast irons
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DOI：10.1016/j.matchar.2026.116408.png)
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Abstract
En 中文
This work investigates the phase constitution, multiscale microstructural architecture and wear-related relationships of rapidly solidified Fe-Cr-C-B cast irons modified with Nb and Mo, produced by centrifugal casting, using an integrated characterization approach combining X-ray diffraction and electron microscopy. Addition of Nb and Mo promotes a hierarchical reinforcement architecture composed of carbides (M7C3 and NbC) and boride networks (M2B and M3B2) embedded in a refined ferritic matrix. Transmission electron microscopy and selectedarea diffraction confirm the crystallographic nature and three-dimensional continuity of the boride skeleton, which constrains ferritic grain growth during solidification, while scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy reveals pronounced elemental partitioning. The Fe68Cr8(C, B)24 and Fe62Cr8Nb4Mo4(C,B)22 alloys exhibit high hardness values of approximately 1175 and 1155 HV0.5, respectively, compared with 666 HV0.5 for the as-cast pig iron, and display markedly improved wear resistance, with specific wear rates of 1.5 & times; 10- 5 and 9.8 & times; 10- 6 mm3 N- 1 m-1, respectively. The superior tribological performance of the Nb- and Mo-containing alloys is attributed to the synergistic action of reinforcing carbides, a percolating boride network and refined secondary borides, demonstrating that multiscale microstructural design is a key strategy for tailoring the performance of advanced wear-resistant cast irons for severe-service applications.
Keywords:
Microstructural refinement
Nanomaterial
Transmission electron microscopy
Tribology
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5.5
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1.1W
Citations:
3.4W
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