Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
The Relationship between Internal Cracking and the Austenite Grain Boundary Segregation of Sulfur Atoms in 9% Ni Cast Steels
Junichiro MURAYAMAHiroo OHTANIYasuya OHMORI
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1987 Volume 73 Issue 1 Pages 191-198

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Abstract

The effect of austenite grain boundary segregation of S atoms on internal cracking in 9% Ni cast steels has been studied mainly by means of Ion Microprobe Mass Analyzer (IMMA).
Internal cracks originate at the austenite grain boundaries which are also primary dendrite interfaces. Internal cracking, however, is not due to the formation of the grain boundary layers of low melting point substance, but arises from the decrease in grain boundary cohesion by S segregation. The segregation of S atoms is largely reduced by Mo addition and such an effect of Mo addition has also been discussed.

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© The Iron and Steel Institute of Japan
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