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《Iron & Steel》 2017-12
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Modification of sulphide inclusions in 20CrMnTi steel by calcium-magnesium treatment

LIU Wei;YANG Shu-feng;LI Jing-she;LI Ji-kang;ZHANG Shuo;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;  
The resulphurized 20CrMnTi steel is with good machinability,but the mechanical property is poor. Ca-Mg duplex treatment can reduce the harm of sulphide in this steel. The effect of Ca-Mg duplex treatment with different proportions on resulfurized 20CrMnTi steel was studied through high temperature experiment and SEM-EDS analysis. The results show that the duplex treatment can modify the II type sulfide inclusion from strip and chain shapes to spherical shape or wrap on oxide inclusion core. The average aspect ratio and diameter decrease dominantly after treatment. During the duplex treatment,Ca mainly reacts with S in steel,which strengthens the spheroidization of sulfide inclusion,and Mg mainly reacts with O in steel,which generates diffusing oxide core of small size. The inclusion types are MnS-CaS-MgO(-Al2O_3-CaO)after treatment.If adding superfluous Mg,MgS will show up insulfide inclusion and if adding superfluous Ca,CaO will show up in oxide inclusion. The Mg in the treatment strengthens the modification effect of Ca,which means that less Ca is needed to reach the same modification,and duplex treatment is better than Ca treatment.
【Fund】: 国家自然科学基金资助项目(51674023)
【CateGory Index】: TG142.1
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