Effect of Ca/Mg on Distribution and Morphology of MnS Inclusions in 45MnVS Non-Quenched and Tempered Steel

The influence of Ca treatment, Mg treatment and Ca–Mg combined on the inclusions in 45MnVS non-quenched tempered steel were studied present work. After melting experiment, a hot rolling test was carried out ingot. Additionally, composition, quantity morphology samples analyzed by automatic scanning electron microscopy (ASPEX) an energy dispersive X-ray spectrometer connected to microscope (SEM-EDS). results indicated that mainly consisted large amount sulfides small oxides. Sulfide could be nucleated precipitated using oxides as core during solidification. proportion spindle-shaped sulfide with smaller sizes higher. MnS–oxide larger than those MnS. rolling, MnS complex oxide cores increased significantly. Compared more formed which can turn become for nucleation precipitation. Thus, increased. conducive formation sulfides, steel. proportions 23.31%, 19.39% 43.24%, respectively.