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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Desiliconization and decarburization behavior of molten Fe-C-Si(-S) alloy with CO2 and O2
TL;DR: In this article, the authors investigated the desiliconization and decarburization behavior of Fe-C-Si alloy with CO2 and O2 and found that silicon should be oxidized in preference to carbon over 0.60 mass pct Si under the condition of sSiO2=aC=1 at 1573 K.
Journal ArticleDOI
Study on the microstructure and mechanical performance for integrated resistance element welded aluminum alloy/press hardened steel joints
Abstract: Resistance element welding (REW) is a recently developed hybrid joining process for aluminum (Al)/steel dissimilar materials. In this study, the microstructure and mechanical performance of the Al/press hardened steel (PHS) joints generated using an integrated REW process were investigated. The microstructure of fusion zone (FZ) between rivet and PHS was lath martensite, which was transformed from the fast cooling of austenite. The Al could be divided into four zones according to the microstructure and microhardness distribution: re-solidified zone (RZ), softening zone (SZ), transition zone (TZ) and base metal (BM). The dissolution and coarsening of the precipitates are responsible for the hardness reduction of Al sheet. The variation of mechanical performance was explained in light of the increasing FZ size and the softening Al sheet as heat input rising. Moreover, four block shear models were introduced to predict the peak load of REW joints using the average hardness of SZ in Al sheet, among which the models from Architectural Institute of Japan (AIJ) provided a relatively good prediction. Considering both the average hardness of SZ and sheet thickness, an analytical model was established to predict the variation of critical nugget sizes and explain the failure mode transition.
Journal ArticleDOI
Soret separation of highly siderophile elements in Fe-Ni-S melts: Implications for solid metal-liquid metal partitioning
James M. Brenan,Neil R. Bennett +1 more
TL;DR: In this paper, the authors investigated the properties of melts consisting of Fe (+ 1-10 wt.% Ni) with added C, Si or S and trace highly siderophile elements (HSE; Ru, Rh, Pd, Re, Os, Ir, Pt and Au).
Journal ArticleDOI
Multiphase-field approach with parabolic approximation scheme
TL;DR: The study compares the driving forces derived from different schemes, but also reveals the interaction of ferrite, austenite and liquid phase during the isothermal solidification, which proves the practicability of the parabolic approximation scheme.
Journal ArticleDOI
Short- and Intermediate-Range Structure and Dynamics of Fe-Ni-C Liquid Under Compression
TL;DR: In this paper, first-principles molecular dynamics simulations were employed to compute the properties of an Fe-Ni-C liquid with a composition of Fe3.7Ni0.37C at 1673 K and pressures from 0 to 67 GPa to benchmark computational methods on pressure effects on the structure and properties of the liquid relative to low pressure experimental results.
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