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The relationship between chromium nitride and secondary austenite precipitation in duplex stainless steels

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Abstract

A detailed investigation of the early stages of secondary austenite precipitation in five duplex stainless steel (DSS) commercial alloys (UNS S32304, S32205, S32550, S32750, and S32760) has been conducted using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on this study, a model is proposed that describes the interaction betwee Cr2N and austenite (intergranular and intragranular) precipitation in these alloys. Depending on nitrogen availability and interface mobility, Cr2N precipitation along existing ferrire/austenite interfaces precedes intergranular secondary austenite growth. The low-energy interfaces formed between the Cr2N, the ferrite, and the austenite, along with the coupled diffusion processes, are the factors controlling this phase transformation. Finally, in the case of the intragranular nitrides, a mechanism is proposed whereby the nitrides serve as sites for heterogeneous nucleation of intragranular secondary austenite.

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Authors and Affiliations

  1. the Industrial, Welding and Systems Engineering Department, The Ohio State University, 43221, Columbus, OH

    A. J. Ramirez (Research Associate) & J. C. Lippold (Professor)

  2. the Metallurgical and Materials Engineering Department, University of São Paulo, São Paulo, SP, Brazil

    S. D. Brandi (Professor)

Authors
  1. A. J. Ramirez
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  2. J. C. Lippold
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  3. S. D. Brandi
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Ramirez, A.J., Lippold, J.C. & Brandi, S.D. The relationship between chromium nitride and secondary austenite precipitation in duplex stainless steels. Metall Mater Trans A 34, 1575–1597 (2003). https://doi.org/10.1007/s11661-003-0304-9

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