HTM ›› 2020, Vol. 45 ›› Issue (1): 26-30.DOI: 10.13251/j.issn.0254-6051.2020.01.006

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Effect of rare earth Ce on solidification structure and inclusions of 253MA heat-resistant steel

Yang Lilin1,2, Qi Jianbo1,2, Zhao Liping1,2, Jia Yongjie2   

  1. 1. Inner Mongolia Key Laboratory of New Metal Material, Baotou Inner Mongolia 014010, China;
    2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China
  • Received:2019-06-17 Online:2020-01-25 Published:2020-04-03

Abstract: The solidification structure and the morphology, composition and structure of inclusions of 253MA steel with different content of rare earth Ce were characterized and analyzed by confocal laser scanning microscope, field emission scanning electron microscopy (FESEM) and electron backscatter diffraction (EBSD). The results show that by comparing the solidification structures of two specimens, the equiaxial grain rate and columnar crystal refining effect can be promoted by the addition of cerium. The rare earth inclusions are CeO 2 and (CeO) 2 SO 4 , which have fine and near-spherical dispersion distributions. It is found according to the statistical analysis and grading that the increase of rare earth Ce content is beneficial to the increase of D-type spherical inclusions, which helps to improve the high temperature resistance and oxidation resistance of the 253MA steel.

Key words: rare earth Ce, heat-resistant steel 253MA, solidification structure, inclusion

CLC Number: