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Rem: Revista Escola de Minas

Print version ISSN 0370-4467

Abstract

BUBANI, Franco de Castro et al. Effect of the temperature on the structure and stability of Fe - 18 Cr - (0 to 60) Ni alloys. Rem: Rev. Esc. Minas [online]. 2010, vol.63, n.1, pp.45-50. ISSN 0370-4467.  http://dx.doi.org/10.1590/S0370-44672010000100008.

The material studied consists of a series of alloys with a basic composition (weight %): 18Cr - 0.01 C - 0.2 Si - 0.4 Mn, and levels of nickel varying from zero to 60%. Alloys in the annealed condition and after deformation at room temperature, 350 and 700°C to simulate the high temperatures achieved during machining were observed by optical microscopy. Equilibrium diagrams were generated by computational thermodynamics (Thermocalc) to predict the behavior of these alloys in a wide range of temperatures. The theoretical thermodynamic equilibrium conditions of the system were compared to the observed microstructures, indicating that the CFC phase in alloys with nickel content between 10% and 30% is, in fact, in a metastable condition at room temperature. Martensitic transformation induced by cold work in the alloy with 10% Ni was observed, validating the computer calculations.

Keywords : Stainless steel; nickel-based alloys; microstructure; machinability; computational thermodynamics.

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