TY - JOUR AU - Gu, Chao AU - Bao, Yan-ping AU - Lin, Lu PY - 2017/03/30 Y2 - 2024/03/29 TI - Cleanliness distribution of high-carbon chromium bearing steel billets and growth behavior of inclusions during solidification JF - Revista de Metalurgia JA - Rev. metal. VL - 53 IS - 1 SE - Articles DO - 10.3989/revmetalm.089 UR - https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/1404 SP - e089 AB - 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-Al<sub>2</sub>O<sub>3</sub> > TiN > MnS. MnS could wrap MgO-Al<sub>2</sub>O<sub>3</sub> and reduces the damage to steel matrix caused by the latter, but generally could not effectively wrap TiN. Besides, TiN could wrap MgO-Al<sub>2</sub>O<sub>3</sub> before MnS, which would weaken the protective capacity of MnS. Moreover, compared with MgO-Al<sub>2</sub>O<sub>3</sub> 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. ER -