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Effect of manganese on the stability of austenite in Fe-Cr-Ni alloys

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Abstract

The phase equilibria between austenite and ferrite in the Fe-Cr-Mn-Ni quaternary system have been computed in the temperature range of 900 ° to 1150 °, using recent thermodynamic interaction parameters. From the computed results, the effectiveness of Mn in replacing Ni as an austenite stabilizer has been evaluated as a function of composition and temperature. The results show that, for 18 wt pct Cr alloys, the computed Ni equivalent of Mn is around zero and becomes negative at higher Cr contents, which is rather surprizing. The function of Mn in 200-type stainless steels is then not so much to stabilize austenite but to supplement the role of Cr in increasing the solubility in austenite of N, which appears to be the more important austenite-stabilizing element.

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  1. Indian Institute of Technology, 110 016, New Delhi, India

    V. Raghavan (Professor)

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  1. V. Raghavan
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Raghavan, V. Effect of manganese on the stability of austenite in Fe-Cr-Ni alloys. Metall Mater Trans A 26, 237–242 (1995). https://doi.org/10.1007/BF02664662

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