Effect of cerium on non-metallic inclusions in Fe-28Mn-10Al-1C lightweight steel
To study the effect of rare-earth Ce on the formation of inclusions in Fe-28Mn-10Al-1C lightweight steels,the morphology,composition,size and number of inclusions in Fe-28Mn-10Al-1C lightweight steels before and after rare earth addition was analyzed by SEM-EDS and Image J analysis software.The results show that the typical inclusions were mainly AlN and AlN-MnS complex inclusions in the current lightweight steel,and a large number of single AlN inclusion was with an average size of 3.64 μm.When 0.001 9%Ce(mass percent)was added,the main inclusions were spherical AlN-Ce2S3,AlN-Ce2S3-MnS,AlN-MnS complex inclusions and single AlN inclusions,the total number of inclusions was the least,and the average diameter and aspect ratio of the inclu-sions were decreased.The size distribution of inclusion was the most uniform and the average size was 3.08 μm.When 0.013%Ce(mass percent)was added,the main inclusions were spherical Ce2S3,AlN-Ce2S3 and single AlN inclusions,the number of inclusions increased abnormally,and the inclusions was with an average size of 2.52 μm.The rare earth treatment can effectively refine the size of inclusions and improve the morphology of Al2O3 and MnS inclusions with a large size,and no single Al2O3 and MnS inclusions were detected in the steel.In addition,the pre-cipitation behavior and evolution process of rare earth Ce on AlN,MnS inclusions and the formation mechanism of rare earth inclusions in Fe-28Mn-10Al-1C lightweight steel were calculated by FactStage8.0.The calculation results show that AlN could be formed during the smelting process,and MnS inclusion trend to heterogeneous nucle-ation.After the addition of 0.001 9%Ce(mass percent),Ce2S3 inclusion precipitated on the surface of AlN and pre-vented the formation of MnS inclusion.With the addition of 0.013%Ce(mass percent),a large number of fine Ce2S3 precipitated in the lightweight steel.
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