Ultra-Thin-Walled Si-Mo SG Castings Reinforced with Titanium–Molybdenum Carbides

Abstract This study presents the development and characterization of ultra-thin-walled Si-Mo SG (ductile iron) castings reinforced with titanium–molybdenum carbides obtained through an in situ SHSB (self-propagating high-temperature synthesis in bath) reaction. The aim was to improve the ductility, toughness, and high-temperature performance of Si-Mo iron by eliminating detrimental eutectic M 6 C carbides and introducing thermodynamically stable (Ti,Mo)C particles. Castings with a wall thickness of only 1 mm were successfully produced using the investment casting process. Metallographic analysis, energy-dispersive X-ray spectroscopy, and electron back-scattered diffraction confirmed the presence of uniformly distributed faceted carbides with excellent casting surface quality. The obtained results demonstrate that the incorporation of in situ synthesized (Ti,Mo)C significantly refines the microstructure and opens new opportunities for ultra-thin-walled castings in high-temperature applications.