Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 30, Issue 4, Pages 451-457Publisher
MANEY PUBLISHING
DOI: 10.1179/1743284713Y.0000000366
Keywords
Duplex stainless steel; Isothermal aging; Precipitation; Microstructure; Grain growth
Funding
- National Natural Science Foundation of China [51071049, 51131008, 51134010]
- Shanghai First-class Academic Discipline Project [S1201YLXK]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20123120120005]
- Foundation for Fostering Young Teachers in Higher Education Institutions of Shanghai [51-13-303-103]
- Doctoral Starting Foundation of the University of Shanghai for Science and Technology [1D-10-303-002]
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The precipitation evolution in UNS S82441 duplex stainless steel during isothermal aging at 700 degrees C was investigated using scanning electron microscopy and transmission electron microscopy. The image analysis results revealed that nitrides, carbides and sigma and x phases nucleate simultaneously, and the growth of the intermetallic phases lags behind that of nitrides and carbides. Nitrides and carbides precipitated at the ferrite/ferrite interfaces are dissolved, and the x phase transforms to the s phase with prolonged aging. In the initial aging stages, the granular s and x phases grow and coalesce according to Ostwald ripening. With a treatment time exceeding 4 h, intermetallic grains having a size larger than those of the adjacent ferrite phase grow following a normal grain growth law, while those small in size keep ripening. The grain growth process of the intermetallic phases has been verified theoretically.
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