The effect of Ca treatment on the modification of inclusions in Al-killed GCr18Mo bearing steel was studied and a thermodynamic and kinetic model was established.The experimental results showed that oxygen content in ...The effect of Ca treatment on the modification of inclusions in Al-killed GCr18Mo bearing steel was studied and a thermodynamic and kinetic model was established.The experimental results showed that oxygen content in the steel could be reduced from 120ug/g to the range 5.5-21.6ug/g by Al-Ca complex deoxidization at 1873 K.An appropriate increase in Ca/Al mass ratio is beneficial to reduce the total oxygen content in steel.When the content of dissolved aluminum was in the range of 0.03%-0.3%,w让h the increase of Ca/Al mass ratio from 0.8-1.6 to 2.4-3.2,the number of inclusions per unit area significantly reduced.In addition,the main types of inclusions were modified from large-sized Al2O3 clusters to plastic or semiplastic liquid phase calcium aluminates.The experimental results matched well with the thermodynamic analysis.展开更多
基金This study was financially supported by the Shanghai University and the Joint Funds of the National Natural Science Foundation of China(Grant No.U1560202).
文摘The effect of Ca treatment on the modification of inclusions in Al-killed GCr18Mo bearing steel was studied and a thermodynamic and kinetic model was established.The experimental results showed that oxygen content in the steel could be reduced from 120ug/g to the range 5.5-21.6ug/g by Al-Ca complex deoxidization at 1873 K.An appropriate increase in Ca/Al mass ratio is beneficial to reduce the total oxygen content in steel.When the content of dissolved aluminum was in the range of 0.03%-0.3%,w让h the increase of Ca/Al mass ratio from 0.8-1.6 to 2.4-3.2,the number of inclusions per unit area significantly reduced.In addition,the main types of inclusions were modified from large-sized Al2O3 clusters to plastic or semiplastic liquid phase calcium aluminates.The experimental results matched well with the thermodynamic analysis.
