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Refinement mechanism of cerium addition on solidification structure and sigma phase of super austenitic stainless steel S32654

查看全文 作　　者：Shucai [1]Zhang;Jiangtao [1]Yu;Huabing [1]Li;Zhouhua [1]Jiang;Yifeng [2]Geng;Hao [1]Feng;Binbin [1]Zhang;Hongchun [1]Zhu 高影响力作者 机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,China;[2]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2022年第7期,共10页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. U1860204, 52004061);Talent Project of Revitalizing Liaoning (Grant No. XLYC1802101);Project funded by China Postdoctoral Science Foundation (Grant No. 2020M670777);Northeastern University Postdoctoral Funds (Grant No. 20200321);Fundamental Research Funds for the Central Universities (Grant No. N2125017)。 摘　　要：The influence of Ce addition on the solidification structure and σphase of super austenitic stainless steel S32654 was systematically investigated via microstructural characterization and thermodynamic calcula- tion. The results indicate that a small addition of Ce could modify MgO and MnS into Ce-bearing inclu- sions Ce_(2)O_(3)and Ce_(2)O_(2)S. Ce addition led to noticeable refinement of both the dendrite structure and σphase. The refinement mechanism could be attributed to the combined actions of effective Ce-bearing inclusions and solute Ce. Effective Ce-bearing inclusions could serve as heterogeneous nucleation cores of austenite as well as σphase, which provided a favorable prerequisite for their refinement. Solute Ce significantly enhanced the undercooling degree of the system, further promoting dendrite structure re- finement. Meanwhile, solute Ce improved the eutectic precipitation conditions of σphase and further promoted its nucleation, while the dendrite refinement limited its growth space. Finally, more fine and dispersed σphase particles formed in S32654 with Ce addition. The refinement of dendrite structure and σ phase will reduce the temperature and time required for high-temperature homogenization, which is beneficial to the hot working of this steel. 关 键 词：Super austenitic stainless steel CERIUM Solidification structure Sigma phase REFINEMENT
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