Metallurgical and Materials Transactions A

, Volume 34, Issue 8, pp 1575–1597 | Cite as

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

  • A. J. Ramirez
  • J. C. Lippold
  • S. D. Brandi
Article

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.

Keywords

Ferrite Austenite Nitrides Material Transaction Orientation Relationship 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2003

Authors and Affiliations

  • A. J. Ramirez
    • 1
  • J. C. Lippold
    • 1
  • S. D. Brandi
    • 2
  1. 1.the Industrial, Welding and Systems Engineering DepartmentThe Ohio State UniversityColumbus
  2. 2.the Metallurgical and Materials Engineering DepartmentUniversity of São PauloSão PauloBrazil

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