Journal ArticleDOI
Thermodynamics and phase diagram of the Fe-C system
TLDR
A critical review of published data provides a fairly accurate knowledge of the thermodynamic properties of all of the phases of the system Fe-C that are stable or metastable at atmospheric pressure as discussed by the authors.Abstract:
A critical review of published data provides a fairly accurate knowledge of the thermodynamic properties of all of the phases of the system Fe-C that are stable or metastable at atmospheric pressure. Selected data are shown as tables and equations. A proposed phase diagram differs only slightly from others recently published but has the following features. Peritectic compositions and the α-γ equilibrium are shown to agree with measured values of the activity of iron in the solid and liquid solutions and the thermodynamic properties of pure iron. Of all the reported carbides of iron only two may be studied under equilibrium conditions. The solubilities of cementite and of χ-carbide in α-Fe are deduced from measured equilibria. Both are metastable at all temperatures with respect to graphite and its saturated solution in iron. The χ-carbide becomes more stable than cementite below about 230° Certain published data on e-carbide permit an estimate of its free energy as a precipitate during the aging process.read more
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Bessemer Memorial Lecture: The dimensions of steel
TL;DR: In this paper, the physical and descriptive dimensions of steel are described, and the magnetic properties of steel have been investigated, such as the thermal expansion coefficient of austenite versus ferrite.
Journal ArticleDOI
Non-oxidative Methane Coupling over Silica versus Silica-Supported Iron(II) Single Sites
Petr Šot,Mark A. Newton,Dirk Baabe,Marc D. Walter,Alexander P. van Bavel,Andrew D. Horton,Christophe Copéret,Jeroen A. van Bokhoven,Jeroen A. van Bokhoven +8 more
TL;DR: In this article, the role of these sites and their speciation under reaction conditions are poorly understood, but they are shown to rapidly initiate CH4 coupling at 1000 °C, leading to 15-22 % hydrocarbons selectivity at 3-4 % conversion.
Journal ArticleDOI
Carbon partitioning between metal and silicate melts during Earth accretion
Carolin E. Fichtner,Max W. Schmidt,Christian Liebske,Anne-Sophie Bouvier,Lukas P. Baumgartner +4 more
TL;DR: In this paper, the authors used secondary ionization mass spectrometer (SIMS) and Raman spectra to identify C-species in the silicate melt and found that the carbon concentration in the carbon-rich silicate melts is higher than the metal melts.
Journal ArticleDOI
Carbon solubilities in iron at elevated temperatures analysed by statistical thermodynamics
TL;DR: In this paper, the carbon solubilities in iron at elevated temperatures (>1000 K) were analyzed on the basis of statistical thermodynamics and the results suggest that the carbon atom is most stable in molten FeCx and least stable in (α-FeCx).
Journal ArticleDOI
Kinetic approach to superconductivity hidden behind a competing order
TL;DR: In this article, a new kinetic approach was proposed to avoid the first-order phase transition to a competing charge order and uncover metastable superconductivity hidden behind, by using current pulse-based rapid cooling of up to ~10 7 K s −1, where the electronic states at low temperatures depend on the history of thermal quenching.
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