σ-Phase formation in chromium ferritic steels
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An increase in the nitrogen and carbon contents in chromium ferritic steels contributes to a slowing of the sigmatization process in the region of 600°C, i.e., at that temperature when the rate of sigmatization is maximum in the pure steels.
Contamination of chromium steels with molybdenum and aluminum expands the two-phase α+σ-region. Acceleration of σ-phase formation is observed simultaneously.
It is recommended that the temperature-time relationships plotted for the outset of σ-phase formation in chromium ferritic steels be used in selecting the heat-treatment regime.
KeywordsNitrogen Aluminum Chromium Molybdenum Carbon Content
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