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Effect of Cooling Rate on Oxide Inclusions During Solidification of 304 Stainless Steel
Author(s) -
Wang Yi,
Yang Wen,
Zhang Lifeng
Publication year - 2019
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900027
Subject(s) - materials science , metallurgy , oxide , inclusion (mineral) , precipitation , growth rate , matrix (chemical analysis) , composite material , mineralogy , chemistry , physics , geometry , mathematics , meteorology
Laboratory experiments are carried out to investigate the effect of cooling rate on oxide inclusions during the solidification of Si‐Mn killed 304 stainless steel. The oxide inclusions in the 304 stainless steel were Al 2 O 3 ‐SiO 2 ‐CaO‐MnO‐MgO system. During the cooling process, the change of inclusions is supposed to consist of two steps. The first step is the precipitation and growth of SiO 2 ‐MnO‐Al 2 O 3 type inclusions during the solidification process of steel. The second step is the transformation of inclusions into the MnO‐Cr 2 O 3 ‐Al 2 O 3 system in solid steel by the interaction between inclusions and the steel matrix. Smaller cooling rate led to the more complete growth and transformation of inclusions. With decreasing the cooling rate, the number of large inclusions increased while that of small inclusions decreased. Meanwhile, the diameter of the inclusions increased. The main reason for the size difference of inclusions at different cooling rates is the difference of inclusion growth during solidification.