Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe-Cr-Al steels.pdf (2.16 MB)
Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe-Cr-Al steels
journal contribution
posted on 2015-10-13, 13:09 authored by Tong Liu, Linbo Wang, Chenxi Wang, Hailong Shen, Hongtao ZhangHongtao ZhangAddition of Al can improve the corrosion resistance of oxide dispersion
strengthened (ODS) steels. However, Al reacts with Y2O3 to form large Y-Al-O
particles in the steels and deteriorates their mechanical properties. Herein, we
successfully prepared Y2Ti2O7 nanoparticles (NPs) by the combination of hydrogen
plasma-metal reaction (HPMR) and annealing. Y2Ti2O7 NPs with contents of 0.2 or 0.6 wt.% were then added into the Fe-14Cr-3Al-2W-0.35Ti (wt.%) steel to substitute the conventional Y2O3 NPs by mechanical alloying (MA). The Y2Ti2O7 NPs transformed into amorphous-like structure after 96 h MA. They crystallized with a fine size of 7.4±3.7 nm and shared a semi-coherent interface with the matrix after hot isostatic pressing (HIP) of the ODS steel with 0.6 wt.% Y2Ti2O7. With the increasing Y2Ti2O7 content from 0.2 to 0.6 wt.%, the tensile strength of the ODS steel increased from 1238 to 1296 MPa, which was much higher than that (949 MPa) of the ODS steel added with Y2O3. The remarkably improved mechanical properties of the Al-containing ODS steels were attributed to the increasing number density of Y2Ti2O7 nanoprecipitates. Our work demonstrates a novel route to fabricate high performance
ODS steels with both high mechanical strength and good corrosion resistance.
Funding
The authors acknowledge the support of this work by the Joint Funds of the National Natural Science Foundation of China (No. U1560106), the Aeronautical Science Foundation of China (No. 2014ZF51069), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Materials & DesignVolume
88Pages
862 - 870Citation
LIU, T. ...et al., 2015. Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe-Cr-Al steels. Materials & Design, 88, pp.862–870.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2015-08-22Publication date
2015-08-29Notes
This paper was accepted for publication in the journal Materials & Design and the definitive published version is available at http://dx.doi.org/10.1016/j.matdes.2015.08.118ISSN
0264-1275Publisher version
Language
- en