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

被引：323
作者：
Ramirez, AJ [1 ]
Lippold, JC
Brandi, SD
机构：
[1] Ohio State Univ, Ind Welding & Syst Engn Dept, Columbus, OH 43221 USA
[2] Univ Sao Paulo, Dept Mat & Met Engn, Sao Paulo, SP, Brazil
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2003年 / 34A卷 / 08期
关键词：
Ferrite; Austenite; Nitrides; Material Transaction; Orientation Relationship;
D O I：
10.1007/s11661-003-0304-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 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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页码：1575 / 1597
页数：23
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