The Effect of Thermo-Mechanical Treatment on Structure of Ultrahigh Carbon PM Steel
| Autor: | Stefan Szczepanik, Łukasz Rogal, Piotr Nikiel, S. J. Skrzypek |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Austenite Materials science Cementite Mechanical Engineering Analytical chemistry 02 engineering and technology Strain rate 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Crystallography chemistry.chemical_compound Lattice constant chemistry Mechanics of Materials Powder metallurgy 0103 physical sciences General Materials Science Crystallite 0210 nano-technology Diffractometer |
| Zdroj: | Journal of Materials Engineering and Performance. 26:1562-1568 |
| ISSN: | 1544-1024 1059-9495 |
| DOI: | 10.1007/s11665-017-2587-9 |
| Popis: | The effects of thermo-mechanical treatment on selected properties related to the structure of Fe-0.85Mo-0.65i-1.4C powder metallurgy (PM) steel are reported. Three kinds of initial microstructure of specimens, i.e., pearlite + ferrite + cementite, martensite + retained austenite and α + spheroidized cementite were examined. Processing was carried out on a plastometer-dilatometer Bahr machine by compression cylindrical specimens at 775 °C at a strain rate of 0.001 s−1. X-ray diffraction was carried out with symmetrical Bragg-Brentano and grazing incident angle methods on a D8-Advance diffractometer with filtered radiation of cobalt CoK α . The following features were determined: texture, density of dislocations, density of vacancies, lattice parameter of Fe α and mean size of crystallites. Significant differences in structure were observed, especially in quenched specimen, as a result of the thermo-mechanical treatment. Regardless of initial state of the specimens, the determined properties were on a similar level. Crystallite size was in the range 97-106 nm, crystallite texture (I{200}/I{110}) × 10 = 1.15-1.62 and density of vacancies I{110}/I{220} = 7.06-7.52. |
| Databáze: | OpenAIRE |
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