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Morphology Control of Sulfide in Fe-Cr-S alloys during the solidification

Published online by Cambridge University Press:  15 February 2011

Katsunari Oikawa ,
Tamio Ikeshoji ,
Hajime Mitsui  and
Kiyohito Ishida
Katsunari Oikawa
Affiliation:
Tohoku National Industrial Research Institute, Materials Engineering Division, 4-2-1, Nigatake, Miyagino-ku, Sendai, Japan.
Tamio Ikeshoji
Affiliation:
Tohoku National Industrial Research Institute, Materials Engineering Division, 4-2-1, Nigatake, Miyagino-ku, Sendai, Japan.
Hajime Mitsui
Affiliation:
Graduated Student, Tohoku Univ., Sendai, Japan.
Kiyohito Ishida
Affiliation:
Dept. of Materials Science and Engineering, Tohoku Univ., Sendai, Japan.
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Abstract

The evolution of sulfide morphology in the Fe- (0.3 to 18) mass% Cr -0.3 mass% S alloys during solidification and its modification by additions of elements such as Mn, Ti, Zr and C have been investigated by means of optical microscopy, scanning electron microscopy and X-ray diffraction. The sulfide morphologies in the Fe-Cr-S ternary alloy are classified under three types: (i) cellwall (ii) fine particle and (iii) globular sulfides. The iron-rich cellwall sulfide is formed in the Fe-(0.3-1) %Cr-0.3 %S alloys. This sulfide morphology changes to the globular type with increasing Cr content and the size of that is more than 51gm. Fine sulfide particles of size smaller than 2 gtm also coexist in the Fe-(0.3-5) %Cr-0.3 %S alloys. Zr or Ti additions change this morphology from the globular type to the rod-like type in the Fe-18 %Cr-0.3 %S alloy, but Mn addition does not have the same effect. The mechanism of the formation of different sulfide morphologies is discussed on the basis of phase diagram information.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 369
Copyright
Copyright © Materials Research Society 2000

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