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Manganese as an austenite stabilizer in FeCrMnC steels

1988; Elsevier BV; Volume: 102; Issue: 1 Linguagem: Inglês

10.1016/0025-5416(88)90539-3

1873-4936

R.L. Klueh, P.J. Maziasz, E.H. Lee,

Welding Techniques and Residual Stresses

As part of an alloy development program for a nickel-free stainless steel, five FeMn, 13 FeCrMn and 15 FeCrMnC alloys were examined to determine the austenite-stable region in the FeCrMnC system. After various heat treatments, optical and electron microscopy studies and magnetic measurements were used to assess the microstructural constituents present. The results indicate that the Schaeffler diagram, which was developed to predict the phases present in FeCrNiC stainless steels, cannot be directly applied to FeCrMnC steels. Manganese has a lower austenite-stabilizing capability against δ-ferrite formation than the Schaeffler diagram predicts by simply considering it half as effective as nickel. However, its stabilizing capability against martensite formation is higher than predicted by the diagram on the same basis. The new results can be used to establish the austenite-stable composition region that should be suitable for alloying to develop a manganese-stabilized stainless steel.