期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.11.091
关键词
Electron microscopy; Ferrous alloy; Sheet forming; Precipitation
类别
资金
- CISRI [S44660]
- Baosteel (Shanghai)
This study presents research works on the effects of precipitation on microstructure, mechanical properties and corrosion resistance of 27.4Cr-3.8Mo-2.1Ni and 24.7Cr-3.4Mo-1.9Ni ferritic stainless steels after heat treatment. Results show that fine precipitates such as a phase and x phase were observed in the 27.4Cr-3.8Mo-2.1Ni ferrite substrate after 0.5 h aging at 950 C. The orientation relationship between the precipitate and substrate lattice interface was (6 0 0) sigma//(0 0 2) alpha; [0 2 0] sigma//[1 1 0]. The a phase and chi Phase precipitates could be dissolved after 0.5-h solution treatment at 1100 degrees C. Mechanical properties such as RT ductility and macro hardness were significantly affected by aging temperature. The ductile-brittle transition temperature ((DBTT)) of 27.4Cr-3.8Mo-2.1Ni impact samples with thickness of 2 mm was approximately -50 degrees C. The order of the pitting potential (E-pit) of the specimens in a 6 wt.% NaCl solution of pH 1.0 at 60 degrees C was: Incone1625 approximate to 9#>1#>6#>>Incoloy825. (C) 2011 Elsevier B.V. All rights reserved.
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