The Relationship between Internal Cracking and the Austenite Grain Boundary Segregation of Sulfur Atoms in 9% Ni Cast Steels

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  • 9% Ni鋳鋼の内部われとSの粒界偏析
  • 9パーセントNi チュウコウ ノ ナイブワレ ト S ノ リュウカイ ヘンセキ

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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).<BR>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.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 73 (1), 191-198, 1987

    The Iron and Steel Institute of Japan

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