Effect of aging temperature on phase decomposition and mechanical properties in cast duplex stainless steels

被引：29
|
作者：
Mburu, Sarah [1 ]
Kolli, R. Prakash [1 ]
Perea, Daniel E. [2 ]
Schwarm, Samuel C. [1 ]
Eaton, Arielle [2 ]
Liu, Jia [2 ]
Patel, Shiv [1 ]
Bartrand, Jonah [2 ]
Ankem, Sreeramamurthy [1 ]
机构：
[1] Univ Maryland, Dept Mat Sci & Engn, 2144 Chem & Nucl Engn Bldg,090, College Pk, MD 20742 USA
[2] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 690卷
基金：
美国国家科学基金会;
关键词：
Spinodal decomposition; Duplex stainless steel; Atom probe tomography; m(23)C(6) carbide; G-phase; ATOM-PROBE TOMOGRAPHY; FE-CU STEEL; SPINODAL DECOMPOSITION; SPECIMEN PREPARATION; TERNARY ALLOYS; KINETICS; FERRITE; CR; PRECIPITATION; SEPARATION;
D O I：
10.1016/j.msea.2017.03.011
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure and mechanical properties in unaged and thermally aged (at 280 degrees C, 320 degrees C, 360 degrees C, and 400 degrees C to 4300 h) CF-3 and CF-8 cast duplex stainless steels (CDSS) are investigated. The unaged CF-8 steel has Cr-rich M23C6 carbides located at the delta-ferrite/gamma-austenite heterophase interfaces that were not observed in the CF-3 steel and this corresponds to a difference in mechanical properties. Both unaged steels exhibit incipient spinodal decomposition into Fe-rich alpha-domains and Cr-rich alpha'-domains. During aging, spinodal decomposition progresses and the mean wavelength (MW) and mean amplitude (MA) of the compositional fluctuations increase as a function of aging temperature. Additionally, G-phase precipitates form between the spinodal decomposition domains in CF-3 at 360 degrees C and 400 degrees C and in CF-8 at 400 degrees C. The microstructural evolution is correlated to changes in mechanical properties.
引用
收藏
页码：365 / 377
页数：13
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