TY - JOUR
T1 - The effects of addition of deoxidation elements on the morphology of (Mn,Cr)S inclusions in stainless steel
AU - Oikawa, K.
AU - Sumi, S. I.
AU - Ishida, K.
N1 - Funding Information:
The authors wish to thank Prof. Emer. T. Nishizawa for invaluable guidance of this investigation. They also would like to thank Mr. Yoshio Kawashita for his help in carrying out this study. They wish to also thank Dr. L. Chandrasekaran of DERA, U.K. for his help in the final preparation of the manuscript for publication. This work was supported by the Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture, Japan.
PY - 1999
Y1 - 1999
N2 - The effects of additions of C, Si, Ti, and Al on the morphology of (Mn,Cr)S inclusions in Fe-15CrlMn-0.3S (mass%) and Fe-15Cr-0.5Mn-0.3S base alloys have been investigated using optical and scanning electron microscopy. Three types of (Mn,Cr)S inclusions morphology have been observed (1) globular-shaped sulfide, (2) rodlike (Mn,Cr)S, and (3) angular (Mn,Cr)S, depending on the Mn content and the presence of additional elements. The formation mechanisms of (Mn,Cr)S inclusions are discussed on the basis of phase diagram information. It is shown that (a) the globular (Mn,Cr)S inclusions observed in 1 % Mn alloys are formed through the metastable monotectic reaction, (b) the rodlike (Mn,Cr)S observed on the addition of Ti and Al are the products of a stable eutectic reaction that proceeds by nucleation of (Mn,Cr)S crystals by the high-melting-point particles such as TiN and Al2O3, (c) the globular (Mn,Cr)S morphology observed in 0.5 % Mn base alloys is the result of a stable monotectic reaction that proceeds through the formation of the low-melting globular (Mn,Cr)S inclusions, and (d) the addition of C and Si promote the stable eutectic reaction by lowering the melting point of Fe-rich solid solution.
AB - The effects of additions of C, Si, Ti, and Al on the morphology of (Mn,Cr)S inclusions in Fe-15CrlMn-0.3S (mass%) and Fe-15Cr-0.5Mn-0.3S base alloys have been investigated using optical and scanning electron microscopy. Three types of (Mn,Cr)S inclusions morphology have been observed (1) globular-shaped sulfide, (2) rodlike (Mn,Cr)S, and (3) angular (Mn,Cr)S, depending on the Mn content and the presence of additional elements. The formation mechanisms of (Mn,Cr)S inclusions are discussed on the basis of phase diagram information. It is shown that (a) the globular (Mn,Cr)S inclusions observed in 1 % Mn alloys are formed through the metastable monotectic reaction, (b) the rodlike (Mn,Cr)S observed on the addition of Ti and Al are the products of a stable eutectic reaction that proceeds by nucleation of (Mn,Cr)S crystals by the high-melting-point particles such as TiN and Al2O3, (c) the globular (Mn,Cr)S morphology observed in 0.5 % Mn base alloys is the result of a stable monotectic reaction that proceeds through the formation of the low-melting globular (Mn,Cr)S inclusions, and (d) the addition of C and Si promote the stable eutectic reaction by lowering the melting point of Fe-rich solid solution.
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U2 - 10.1361/105497199770335749
DO - 10.1361/105497199770335749
M3 - Article
AN - SCOPUS:0032655118
VL - 20
SP - 215
EP - 223
JO - Bulletin of Alloy Phase Diagrams
JF - Bulletin of Alloy Phase Diagrams
SN - 1547-7037
IS - 3
ER -