Designing spherical cementite in bainitic matrix (SCBM) microstructures in high carbon powder metal steels to improve dry sliding wear resistance
| Autor: | Ahmet Güral, Onur Altuntaş |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Quenching
Materials science Cementite Mechanical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials Powder metallurgy Martensite General Materials Science Lamellar structure Composite material Pearlite 0210 nano-technology Eutectic system |
| Zdroj: | Materials Letters. 249:185-188 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2019.04.095 |
| Popis: | Spherical cementite particles in the bainitic matrix in high carbon steel processed by powder metallurgy (PM) method were produced and compared with separately sintered, fully bainitic and spherical cementite in the ferritic matrix microstructures for their microstructure-hardness-dry sliding wear properties. The primary cementite plus dense lamellar pearlite structures were achieved in the sintered specimens. The spherical cementites in the ferritic matrix (SCFM) were obtained by over-tempering of the martensite phase produced by quenching after the sintering process. To produce spherical cementite in the bainitic (SCBM) microstructure, SCFM specimens were partially austenitised at 735 degrees C over Ac-1 eutectoid temperature for 3 min and austempered at 300 degrees C for 1-2 h. Dry sliding wear resistance behavior of the specimens were examined under the constant load of 10 N at sliding distance of 1500 m. The dry sliding wear resistances of the SCBM specimens were much better than the microstructures produced by conventional heat treatments. (C) 2019 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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