Abstract
The effects of cerium (Ce) addition (0, 0.015% and 0.045%) on the microstructure, inclusions and impact toughness of Fe-18%Mn-0.6%C twinning-induced plasticity (TWIP) steel were investigated. The results show that the addition of Ce has no significant effect on the texture of TWIP steel. The grain size of TWIP steel decreases, and the volume fraction of twins increases slightly with Ce addition. Typical MnO-MgO-MnS complex inclusions and MnS were observed in TWIP steel without Ce. The inclusions gradually transform from the long strip MnS-Ce oxysulfide complex inclusions to ellipsoidal Ce oxysulfides with the increase in Ce addition from 0.015% to 0.045%. Notably, the transverse impact toughness of TWIP steel with 0.015% Ce addition is much lower than that of the other samples and exhibits serious anisotropy, and these differences are attributed to the stronger deformation ability of the complex inclusions with MnS and Ce oxysulfides compared with Ce oxysulfides. Fine grain size and ellipsoidal inclusions lead to excellent isotropic properties in TWIP steel with 0.045% Ce addition.
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