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Kinetic Study to Predict Sigma Phase Formation in Duplex Stainless Steels

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Abstract

This work presents an improved kinetic study of sigma phase formation during isothermal aging between 973 K and 1223 K (700 °C and 950 °C), based on Kolmogorov-Johnson-Mehl-Avrami (K-J-M-A) model, established from volume fraction of sigma phase determined in backscattered electron images over polished surfaces of aged samples. The kinetic study shows a change in the main mechanism of sigma formation between 973 K and 1173 K (700 °C and 900 °C), from a nucleation-governed stage to a diffusion-controlled growth-coarsening stage, confirmed by a double inclination in K-J-M-A plots and microstructural observations. A single inclination in K-J-M-A plots was observed for the 1223 K (950 °C) aging temperature, showing that kinetic behavior in this temperature is only related to diffusion-controlled growth of sigma phase. The estimated activation energies for the nucleation of sigma phase are close to the molybdenum diffusion in ferrite, probably the controlling mechanism of sigma phase nucleation. The proposed time-temperature-transformation (TTT) diagram shows a “double c curve” configuration, probably associated to the presence of chi-phase formed between 973 K and 1073 K (700 °C and 800 °C), which acts as heterogeneous nuclei for sigma phase formation in low aging temperatures.

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Acknowledgments

The authors would like to thank Professor Carlos de Moura Neto (in memoriam) for his kind and untiring support throughout the development of this work. The authors also would like to thank the Brazilian National Council of Scientific and Technological Development—CNPq (Process 141094/2011-7) for the financial support.

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Authors and Affiliations

  1. Ignatian Educational Foundation (FEI), Av. Humberto Castelo Branco, 3972, São Bernardo do Campo, SP, 09850-901, Brazil

    Daniella Caluscio dos Santos (Assistant Professor) & Rodrigo Magnabosco (Professor)

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  1. Daniella Caluscio dos Santos
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  2. Rodrigo Magnabosco
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Correspondence to Daniella Caluscio dos Santos.

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Manuscript submitted June 15, 2015.

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dos Santos, D.C., Magnabosco, R. Kinetic Study to Predict Sigma Phase Formation in Duplex Stainless Steels. Metall Mater Trans A 47, 1554–1565 (2016). https://doi.org/10.1007/s11661-016-3323-z

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  • DOI: https://doi.org/10.1007/s11661-016-3323-z

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