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

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 t...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2003-08, Vol.34 (8), p.1575-1597
Main Authors: RAMIREZ, A. J, LIPPOLD, J. C, BRANDI, S. D
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metallurgy
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Solid-phase precipitation
Steel
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Summary: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 between Cr^sub 2^N and austenite (intergranular and intragranular) precipitation in these alloys. Depending on nitrogen availability and interface mobility, Cr^sub 2^N precipitation along existing ferrire/austenite interfaces precedes intergranular secondary austenite growth. The low-energy interfaces formed between the Cr^sub 2^N, 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. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-003-0304-9