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
Citations
More filters
Journal ArticleDOI
Effect of sulfur on the stability of cementite
TL;DR: In this paper, it was shown that in CO-H{sub 2}S/H{ sub 2} ratios and temperatures in which iron is inert against metal dusting, corresponds to the range where a monolayer of sulfur is adsorbed in iron.
Journal ArticleDOI
On the solidification of nodular cast iron and its relation to the expansion and contraction
TL;DR: In this article, Mg-treated cast iron alloys were evaluated in terms of the volume fraction of liquid, austenite and graphite, and the formation of small macropores was observed at the very end of the solidification process.
Journal ArticleDOI
Microstructural heterogeneity and its relationship to the strength of martensite
Guillaume Badinier,Guillaume Badinier,Chad W. Sinclair,Xavier Sauvage,Xiang Wang,V. Bylik,Mohamed Gouné,Frédéric Danoix +7 more
TL;DR: In this article, a set of controlled experiments were performed to highlight how carbon redistribution during quenching and/or low temperature tempering can affect mechanical response, and the gradual transition from elastic to plastic deformation was interpreted based on possible sources of microstructural heterogeneity.
Journal ArticleDOI
Phase relationships in the Fe-Cr-Ni system at solidification temperatures
D. M. Kundrat,J. F. Elliott +1 more
TL;DR: The phase relationship between the liquid phase and the primary solid phases was investigated in the iron-rich corner of the Fe-Cr-Ni system as part of a larger study.
Journal ArticleDOI
On Peritectic Reactions and Transformations in Low-Alloy Steels
Hani Nassar,Hasse Fredriksson +1 more
TL;DR: In this article, it was shown through thermodynamic analysis of the equilibrium at the triple point that the increase in energy of the two phases due to this strain can result in undercooling below the equilibrium peritectic temperature and decreases in equilibrium per-itectic concentrations.
References
More filters