Room temperature ductility of NiAl-strengthened ferritic steels: Effects of precipitate microstructure

被引：32
|
作者：
Teng, Z. K. [1 ]
Liu, C. T. [1 ,2 ,3 ]
Miller, M. K. [4 ]
Ghosh, G. [5 ]
Kenik, E. A. [4 ]
Huang, S. [1 ]
Liaw, P. K. [1 ]
机构：
[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] City Univ Hong Kong, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
[3] Auburn Univ, Auburn, AL 36849 USA
[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[5] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 541卷
关键词：
Ductility; Ferritic steels; NiAl; Precipitation; MECHANICAL-PROPERTIES; CR ALLOYS; FRACTURE; BEHAVIOR; DEFORMATION; DISPERSION; IRON; PARTICLES; CRYSTALS; CREEP;
D O I：
10.1016/j.msea.2012.01.103
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of precipitate microstructure on the room temperature ductility of a series of carefully designed Fe-Al-Ni-Cr-Mo steels were investigated. Transmission electron microscopy (TEM), ultra small angle X-ray scattering (USAXS), and atom probe tomography (APT) were conducted to quantify the nano-scaled precipitates. The accuracy of the characterization results was verified by a numerical analysis. Three point bending tests results demonstrated that ductility was a function of the precipitate volume fraction and the Al and Ni concentrations in the Fe matrix, these relationships were discussed in terms of possible mechanisms. The ductility was also found to be independent of the precipitate size and inter-particle spacing in the studied range, which was validated by a theoretical model. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：22 / 27
页数：6
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