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Mechanical Properties and Formation Mechanism of Surface Hard Nanocrystalline Carbon Diffusion Layer on 18Cr2Ni4WA Steel Induced by Supersonic Fine Particle Bombarding.
- Source :
- Journal of Materials Engineering & Performance; Sep2023, Vol. 32 Issue 17, p7980-7990, 11p
- Publication Year :
- 2023
-
Abstract
- Nanostructured carbon diffusion layers were produced on the 18Cr2Ni4WA low carbon steel using supersonic fine particles bombarding (SFPB) with activated carbon powders and low-temperature annealing at 500 °C. The microstructures and the formation mechanism of hard nanocrystalline carbon diffusion layers were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and molecular dynamics simulation. Additionally, the nano-hardness of the diffusion layer was measured by nanoindentation apparatus and the tribological properties were tested by wear tester. The results show that the thickness of the hard nano-carburized layer is about 20 μm. During SFPB treatment, high-speed Al<subscript>2</subscript>O<subscript>3</subscript> particles carrying activated carbon powder impact on the surface of 18Cr2Ni4WA steel, resulting in the formation of high-density dislocations and nano-surface structure, and a large amount of carbide precipitates at grain boundaries and internal defects. The carbon content of the steel surface increased from 0.17 to 4.2% (wt.%). After annealing treatment, the nano-hardness of the carburized layer reaches 7.6 GPa and the friction coefficient decreases to 0.63. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10599495
- Volume :
- 32
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Journal of Materials Engineering & Performance
- Publication Type :
- Academic Journal
- Accession number :
- 170407450
- Full Text :
- https://doi.org/10.1007/s11665-022-07695-3