Abstract：To clarify the influence of Ca treatment on the effect of Rare Earth (RE) in C-Mn steel, scanning electron microscope, optical microscope and ultra-depth three-dimensional microscope were used to observe inclusion and microstructure for test steels. Combining with thermodynamic calculation and impact fracture analysis, the influence of RE and Ca-RE complex treatment on mechanical behavior of C-Mn steel was studied comparatively. The conclusions were as follows: after RE added into steel, the inclusion was changed into nearly spherical complex inclusions containing RE oxide, the size and aspect ratio of the inclusion decreased. For the steel treated by Ca-RE，almost all the inclusions became spherical complex inclusions of RE-Ca, and the cleanliness of steel increased. Ca in steel can increase the yield of RE from 7.6% to 42.4% improving the utilization rate of RE effectively. After the complex treatment of Ca-RE, the content of pearlite increased and so did in the strength of steel. All findings indicated that it is feasible to use Ca to improve the effect of RE in C-Mn steel.
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2020, Vol. 55 
