Evolution of microstructure and tensile properties of Fe-18Ni-12Cr based AFA steel during aging at 700 °C

被引：35

作者：

Wang, Man ^{[1
,2
]}

Sun, Hongying ^{[3
]}

Phaniraj, Madakashira P. ^{[4
,5
]}

Han, Heung Nam ^{[4
,5
]}

Jang, Jinsung ^{[2
]}

Zhou, Zhangjian ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 10083, Peoples R China

[2] Korean Atom Energy Res Inst, Nucl Mat Dev Div, Daejeon 305353, South Korea

[3] Anyang Inst Technol, Sch Mech Engn, Anyang 455002, Peoples R China

[4] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea

[5] Seoul Natl Univ, Res Inst Adv Mat, Seoul 151744, South Korea

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 672卷

关键词：

Alumina-forming austenitic steel; Aging; Precipitate; Tensile properties; AUSTENITIC STAINLESS-STEEL; HIGH-TEMPERATURE CREEP; MECHANICAL-PROPERTIES; OXIDATION RESISTANCE; LAVES PHASE; PRECIPITATION; BEHAVIOR; STRENGTH; ALLOYS;

D O I：

10.1016/j.msea.2016.06.060

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effects of aging at 700 degrees C on the microstructure and tensile properties of an alumina-forming austenitic (AFA) stainless steel were investigated. With increasing aging time, B2-NiAl and Laves phase precipitated first on grain boundaries (GB) and then in the grain interior. The GB precipitate coverage reached 74% after aging for 1000 h. The GB precipitates not only suppressed grain coarsening during aging, but also influenced the tensile fracture mode at 700 degrees C by partitioning stress concentration on triple junctions. Moreover plate-like and spherical NbC particles precipitated during aging. Spherical NbC with size of around 5 nm were stable, while plate-like NbC grew to 89 nm after aging for 1000 h. These precipitates played an important role on the tensile strength. Age hardening contributed to the increasing tensile strength at RT with aging time, while the softening mechanism of dynamic recovery dominated the tensile tests at 700 degrees C. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：23 / 31

页数：9

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