Tribological properties of the Fe-Al-Cr alloyed layer by double glow plasma surface metallurgy

Published on Jul 21, 2016in Journal of Materials Engineering and Performance1.819
· DOI :10.1007/S11665-016-2235-9
Xixi Luo7
Estimated H-index: 7
(NUAA: Nanjing University of Aeronautics and Astronautics),
Zhengjun Yao29
Estimated H-index: 29
(NUAA: Nanjing University of Aeronautics and Astronautics)
+ 2 AuthorsZhangzhong Wang5
Estimated H-index: 5
(NJIT: Nanjing Institute of Technology)
Sources
Abstract
A Fe-Al-Cr alloyed layer was deposited onto the surface of Q235 low-carbon steel via double glow plasma surface metallurgy (DGPSM) to improve the steel’s wear resistance. After the DGPSM treatment, the Fe-Al-Cr alloyed layer grown on the Q235 low-carbon steel was homogeneous and compact and had a thickness of 25 µm. The layer was found to be metallurgically adhered to the substrate. The frictional coefficient and specific wear rate of the sample with a Fe-Al-Cr alloyed layer (treated sample) were both lower than those of the bare substrate (untreated sample) at the measured temperatures (25, 250 and 450 °C). The results indicated that the substrate and the alloyed layer suffered oxidative wear and abrasive wear, respectively, and that the treated samples exhibited much better tribological properties than did the substrate. The formation of Fe2AlCr, Fe3Al(Cr), FeAl(Cr), Fe(Cr) sosoloid and Cr23C6 phases in the alloyed layer dramatically enhanced the wear resistance of the treated sample. In addition, the alloyed layer’s oxidation film exhibited a self-healing capacity with lubrication action that also contributed to the improvement of the wear resistance at high temperature. In particular, at 450 °C, the specific wear rate of treated sample was 2.524 × 10−4 mm3/N m, which was only 45.2% of the untreated sample.
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