Abstract：Duplex stainless steel has excellent properties of austenitic and ferritic stainless steel,which is widely used in shipbuilding,chemical industry,nuclear reaction and other fields. In order to further improve the mechanical properties and corrosion resistance of S32550 duplex stainless steel,S32550 duplex stainless steel was successfully smelted with vacuum induction furnace first. Furthermore,the effects of rare earth Ce on the microstructure,inclusion morphology and impact properties of the alloy after forging and rolling were studied. The results show that the addition of rare earth Ce can refine the grain of the structure and homogenize the strontium ferrite structure and the austenite structure with uneven shape distribution,improve the shape distribution of inclusions,modify the harmful inclusions MnS,reduce the S content,and make the excess S element react with Ce to form Ce2O2S,Ce2S2 inclusions dispersed in steel.In addition,the addition of rare earth Ce can improve the impact toughness of S32550 duplex stainless steel under the impact of room temperature and low temperature (-40,-20 ℃). At low temperature,the dimple zone can appear,which reduces the damage of steel to cold and brittle effect.
杨吉春, 王军, 任磊, 富晓阳, 刘香军, 张泽宁. 铈对S32550双相不锈钢微观组织及冲击性能的影响[J]. 钢铁, 2020, 55(1): 86-92.
YANG Ji-chun, WANG Jun, REN Lei, FU Xiao-yang, LIU Xiang-jun, ZHANG Ze-ning. Effect of Ce on microstructure and impact propertiesof S32550 duplex stainless steel. Iron and Steel, 2020, 55(1): 86-92.
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2020, Vol. 55 
