Effects of constrained groove pressing, severe shot peening and ultrasonic nanocrystal surface modification on microstructure and mechanical behavior of S500MC high strength low alloy automotive steel
| Autor: | Erfan Maleki, Ibrahim Karademir, Auezhan Amanov, Okan Unal, Fazil Husem, Mustafa Bahattin Celik |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
UNSM Alloy General Physics and Astronomy 02 engineering and technology engineering.material 010402 general chemistry Shot peening 01 natural sciences Nanocrystallization Wear Surface layer S500MC Composite material Groove (music) SSP Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 0104 chemical sciences Surfaces Coatings and Films engineering Surface modification Strength Severe plastic deformation Elongation 0210 nano-technology |
| Zdroj: | APPLIED SURFACE SCIENCE |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2020.147935 |
| Popis: | S500MC high strength low alloy automotive steel is exposed to bulk severe plastic deformation (SPD) via constrained groove pressing (CGP) and surface severe plastic deformation (S2PD) via severe shot peening (SSP) and ultrasonic nanocrystal surface modification (UNSM). SSP and UNSM could create a nanocrystallization layer till 50–100 µm away from outmost surface. EBSD investigations showed average nano-grain size obtained via SSP and UNSM was found to be below 100 nm regime. The strength was improved via 1st to 4th pass of CGP, but elongation percentage decreased abruptly. UNSM achieves both strength-ductility improvement with gradient structure. SSP improves the total elongation however a slight decrease on strength is observed. SSP and UNSM showed better wear and friction resistance particularly at lower loads compared to CGP and untreated specimens. Nevertheless, wear and friction behavior at higher loads showed better responses for Bulk-SPD applications regardless of pass numbers. The frictional load increase played a detrimental role in removing a nanocrystallization surface layer and diminishing the positive influence of SSP and UNSM. |
| Databáze: | OpenAIRE |
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