| Abstract Scope |
This research investigates the impact of varying cerium concentrations on the microstructure and mechanical properties of free-cutting steel. Free-cutting steel typically contains sulfur to improve machinability. However, the formation of manganese sulfide inclusions are prone to elongate during the hot working process and adversely affect mechanical properties. To address these challenges, cerium is added to modify MnS inclusions, reducing their occurrence and transforming them into smaller, spherical, cerium-containing particles. This modification process plays a crucial role in refining grain size and improving mechanical properties. Experimental methods include high-vacuum arc melting to incorporate cerium, analyzing composition, morphology, distribution, and nano-hardness of non-metallic inclusions. Tensile tests, hot rolling, heat treatment, and nanoindentation are employed to evaluate macroscopic and microscopic mechanical properties. The study aims to provide valuable insights into the role of cerium as an inclusion modifier and develop free-cutting steels with enhanced cutting characteristics and superior mechanical properties. |