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| Effect of Ce on inclusion modification in a new type super duplex stainless steel 2707HD |
| GAO Jian-bing1，CHANG Peng-fei2，ZHANG Bin-bin2，JIANG Zhou-hua2，LI Hua-bing2 |
（1. Shanxi Taigang Stainless Steel Co.， Ltd.， Taiyuan 030003， Shanxi， China
2. School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China） |
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Abstract In order to improve the cleanliness of the steel and realize the harmlessness control of the inclusions, the effect of Ce on inclusion modification behavior of a new type super duplex stainless steel 2707HD was researched. The possible inclusions generate type in super duplex stainless steel with Ce was preliminary determined by thermodynamics calculation. The sizes，morphology and type of inclusions were characterized and analyzed by metallographic microscope，scanning electron microscope，energy dispersive spectrometer and Image-Pro6.0. The results showed that the tiny inclusions （less than 1 μm） and 1-2 μm inclusions increase，while the proportion of inclusions larger than 2 μm decrease in the super duplex stainless steel with mass percent of 0.03% Ce. The proportion of inclusions smaller than 2 μm decreased，and inclusions larger than 5 μm were formed with mass percent of 0.06% Ce. Ce can transform irregular Al2O3 inclusions into regular Ce2O3 and Ce2O2S rare earth inclusions and accompanied by the formation of Ce2O3-Ce2O2S and CeAlO3-Ce2O2S composite inclusions. Moreover Ce element can effectively decrease the amount of irregular inclusions.
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Received: 14 March 2018
Published: 11 October 2018
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2018, Vol. 53 
