Distribución y crecimiento de inclusiones en la solidificación de barras de acero para rodamientos con cromo y alto contenido de carbono

Chao Gu; Yan-ping Bao; Lu Lin

doi:10.3989/revmetalm.089

Authors

Chao Gu State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing https://orcid.org/0000-0002-0668-4859
Yan-ping Bao State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing https://orcid.org/0000-0002-1881-0939
Lu Lin State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing https://orcid.org/0000-0002-3096-4164

DOI:

https://doi.org/10.3989/revmetalm.089

Keywords:

Billets, Distribution of inclusions, Formation sequence, Total oxygen contents

Abstract

Variation of cleanliness and distribution of inclusions in thickness and width direction of high-carbon chromium bearing steel billets has been studied using total oxygen and nitrogen analysis and SEM/EDS, and the growth behavior of inclusions during solidification was studied with the help of solidification model. The region with relatively high total oxygen contents in the cross profile of billets is between inner arc side 3/16 and outer arc side 1/4; between left edge side 5/16 and right edge side 5/16. The formation sequence of inclusions is MgO-Al₂O₃ > TiN > MnS. MnS could wrap MgO-Al₂O₃ and reduces the damage to steel matrix caused by the latter, but generally could not effectively wrap TiN. Besides, TiN could wrap MgO-Al₂O₃ before MnS, which would weaken the protective capacity of MnS. Moreover, compared with MgO-Al₂O₃ inclusions, the sizes of TiN inclusions are generally larger. Thus the control of TiN inclusions should be strengthened. In thickness direction, the maximum size regions of TiN and MnS inclusions are inner arc side 1/3 and outer arc side 1/3; in width direction, the regions are edge side 1/3. During bearing processing, these regions and the regions with high total oxygen content should be avoided.

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