Cementite
نویسندگان
چکیده
منابع مشابه
Influence of silicon on cementite precipitation in steels
The mechanism by which relatively small concentrations of silicon influence the precipitation of cementite from carbon supersaturated austenite and ferrite are investigated. It is found that one condition for the retardation of cementite is that the latter must grow under para-equilibrium conditions, i.e. the silicon must be trapped in the cementite. However, this is not a sufficient condition ...
متن کاملStructure and stability of Fe3C-cementite surfaces from first principles
We report results of gradient-corrected pseudopotential-based density functional theory calculations on bulk Fe3C in the cementite structure and its (0 0 1), (1 1 0), (0 1 1), (1 0 0), (1 0 1), (0 1 0), and (1 1 1) surfaces. Bulk properties are in reasonable agreement with available experimental data. The cementite local density of states shows predominantly metallic character, along with some ...
متن کاملSubstitutional solution of silicon in cementite: A first-principles study
Cementite precipitation from austenite in steels can be suppressed by alloying with silicon. There are, however, no validated thermodynamic data to enable phase equilibria to be estimated when silicon is present in cementite. The formation energies of Fe3C, (Fe11Si 4c Fe)C4 and (Fe11Si 8d Fe)C4 have therefore been estimated using firstprinciples calculations based on the total-energy all-electr...
متن کاملDilatometric analysis of cementite dissolution in hypereutectoid steels containing Cr
Cementite dissolution in hypereutectoid steels containing Cr is analyzed using dilatometry combined with the consideration of the carbon content in the austenite. The results suggest that the austenite transformed from the mixture of ferrite and cementite can be approximated to have a carbon content corresponding to equilibrium with ferrite. The overall dissolution behavior of cementite is desc...
متن کاملElectropulse - induced cementite nanoparticle formation in deformed pearlitic steels
Passing one electric-current pulse through deformed pearlitic steel wires at room temperature causes the formation of cementite particles around 30 nm in size. This is found not only in some particular locations but throughout the cementite area, which reveals a different mechanism from traditional spheroidization of cementite plates because the latter leads to the formation of particles with m...
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ژورنال
عنوان ژورنال: International Materials Reviews
سال: 2019
ISSN: 0950-6608,1743-2804
DOI: 10.1080/09506608.2018.1560984