SEDL / STP / STP1532-EB / STP153220120008

The Effect of Si on the Precipitates for Nb Bearing High Purity Ferritic Stainless Steel

Ito, Masatoshi
Kyushu Univ., Fukuoka,

Honda, Yuma
Kyushu Univ., Fukuoka,

Aramaki, Masatoshi
Research Associate, Kyushu Univ., Fukuoka,

Kato, Yasushi
Senior Researcher, JFE Steel Corporation, Chiba,

Furukimi, Osamu
Professor, Kyushi Univ., Fukuoka,

Pages: 6    Published: Apr 2012

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Abstract

The effect of Si on the precipitation of the Laves phase in high purity 17Cr–0.5Nb ferritic stainless steel was investigated. Precipitation was observed using a scanning electron microscope and transmission electron microscope. Quantitative analysis of the amount of precipitates as Laves phase was performed. The precipitation rate of the Laves phase and the equilibrium amount of precipitates of the Laves phase increased with the amount of Si. A Si peak was detected in the Laves phase in 0.5Si steel by energy dispersive X-ray spectrometer analysis. It was revealed that precipitation of the Laves phase was promoted and the chemical composition of the Laves phase was changed by the addition of Si.