Crystallization of alumina modified by rare earth elements in SWRS82B steel
WANG Yi1,2, LI Chang-rong1,2, ZENG Ze-yun1,2, XI Zuo-bing1,2
1. School of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China; 2. Guizhou Key Laboratory of Metallurgical Engineering and Process Energy Conservation, Guiyang 550025, Guizhou, China
Abstract:In order to further study and control the alumina inclusions in SWRS82B steel,the modification of alumina with rare earth element cerium was studied. The thermodynamics and edge-edge matching model were used to calculate the precipitation conditions of rare earth inclusions and the degree of interatomic mismatch between Al2O3 and rare earth oxygen (sulfide) compounds,and between γ-Fe and rare earth oxygen (sulfide) compounds, which investigate the effectiveness of rare earth cerium inclusions as heterogeneous nucleation of Al2O3 and γ-Fe,and further prove the effectiveness of rare earth cerium elements to modify B-type alumina inclusions and improve the properties of steel. The calculation results show that in the temperature range from 0 to 2 000 K,the Gibbs free energy for the reaction to generate CeAlO3 inclusions is the lowest,and the possibility of cerium oxide (sulfide) formation is low under the same conditions,and the rare earth cerium oxide (sulfur) compound can be used as the core of heterogeneous nucleation of Al2O3,and the rare earth cerium oxy (sulfide) compound can be used as the core of heterogeneous nucleation of γ-Fe;Al2O3 can effectively nucleate on the rare earth cerium oxide (sulfide) compound,and Al2O3 is preferentially heterogeneous nucleation occurs on Ce2O2S;γ-Fe can effectively nucleate on Al2O3 and rare earth cerium (sulfide) compounds,and γ-Fe preferentially nucleates on Al2O3,causing irregularly shaped alumina inclusions to transform into near-spherical cerium aluminate inclusions,revealing the mechanism of non-metallic inclusions in SWRS82B steel to degenerate. The actual effect of plastic inclusion treatment provides a theoretical basis.
王奕, 李长荣, 曾泽芸, 席作冰. SWRS82B钢中稀土元素对氧化铝改性的晶体学[J]. 钢铁, 2020, 55(10): 69-74.
WANG Yi, LI Chang-rong, ZENG Ze-yun, XI Zuo-bing. Crystallization of alumina modified by rare earth elements in SWRS82B steel[J]. Iron and Steel, 2020, 55(10): 69-74.
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