Thermodynamic Reoptimization of the Fe-P System

Zhan-Min, CAO; Wang, Kunpeng; Qiao, Zhiyu; Guang-Wei, DU

doi:10.3866/pku.whxb201111172

Cited by 13 publications

(1 citation statement)

References 19 publications

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“…So far, the Fe-P [13][14][15][16][17][18][19] and Fe-Si [20][21][22][23][24][25][26][27] systems have been thermodynamically modeled in many studies and were recently reoptimized by the present authors [28,29]. A complete thermodynamic modeling of the Si-P system was performed by Jung and Zhang [30] and Liang and Schmid-Fetzer [31].…”

Section: Introductionmentioning

confidence: 99%

Critical Evaluation and Thermodynamic Re-Optimization of the Si–P and Si–Fe–P Systems

et al. 2023

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Thermodynamic modeling of the Si–P and Si–Fe–P systems was performed using the CALculation of PHAse Diagram (CALPHAD) method based on critical evaluation of available experimental data in the literature. The liquid and solid solutions were described using the Modified Quasichemical Model accounting for the short-range ordering and Compound Energy Formalism considering the crystallographic structure, respectively. In the present study, the phase boundaries for the liquidus and solid Si phases of the Si–P system were reoptimized. Furthermore, the Gibbs energies of the liquid solution, (Fe)3(P,Si)1, (Fe)2(P,Si)1, and (Fe)1(P,Si)1 solid solutions and FeSi4P4 compound were carefully determined to resolve the discrepancies in previously assessed vertical sections, isothermal sections of phase diagrams, and liquid surface projection of the Si–Fe–P system. These thermodynamic data are of great necessity for a sound description of the entire Si–Fe–P system. The optimized model parameters from the present study can be used to predict any unexplored phase diagrams and thermodynamic properties within the Si–Fe–P alloys.

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Section: Introductionmentioning

confidence: 99%

Critical Evaluation and Thermodynamic Re-Optimization of the Si–P and Si–Fe–P Systems

et al. 2023

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Reductive Heating Experiments on BOF-Slag: Simultaneous Phosphorus Re-Distribution and Volume Stabilization for Recycling

Yang

Lee

et al. 2016

steel research int.

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Basic-oxygen furnace (BOF) slag is the second abundant by-product from the steel-making process. It is not readily recycled for high phosphorus content and volume instability. To eliminate its phosphorus-hosting dicalcium silicate (C 2 S) and volumetrically unstable free-lime, reductive heating experiments on BOF-slag are carried out at 1300-1600 8C using quartz-sand or serpentine as a basicity modifier. In the products, C 2 S and free-lime are consumed through reacting with CaO and MgO, which are produced by Ca-ferrite and Mg-wustite reduction, respectively, to form merwinite and akermanite. The products are also characterized by silicatemetal segregation and the extent of that increases with increasing temperature and decreasing particle size of starting mixtures. Thermodynamic calculations show that phosphorus in C 2 S is mostly converted to Fe 2 P in the metal domain. Compared to the slag-serpentine experiments, the slag-quartz experiments resulted in higher extents of silicate-metal segregation with lower phosphorus contents of %0.1% in the silicate domain, which therefore is recyclable. To optimize silicate-metal segregation for recycling BOF-slag, it is suggested (i) bringing the BOF-slag composition within the low-temperature side of the C 2 S-merwinite-akermanite Alkemade triangle by adding quartz-sand; (ii) reductively heating to 1500-1600 8C; and (iii) cooling slowly then quenching to suppress C 2 S crystallization from melts.

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Experimental Study of High Temperature Phase Equilibria in the Iron-Rich Part of the Fe-P and Fe-C-P Systems

Bernhard

Presoly

Fuchs

et al. 2020

Metall Mater Trans A

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During the solidification of steel, phosphorus strongly segregates in the interdendritic liquid phase. In the continuous casting process, even low levels of P may have a detrimental effect on the final product quality. However, phosphorus is partly added up to 0.10 wt pct to improve the mechanical properties of advanced steel grades nowadays, e.g., High-Strength Interstitial-Free (HSIF). To provide new experimental data for the development of thermodynamic databases and solidification models for P alloyed steel grades, phase equilibria in the Fe-P and Fe-C-P key systems were studied up to 1550 °C using differential scanning calorimetry (DSC) and high temperature laser scanning confocal microscopy (HT-LSCM). Special focus was placed on solid/liquid equilibrium temperatures in the Fe-rich part of the binary Fe-P system between 0.025 and 9 wt pct P. In the ternary system, three isoplethal sections with 0.10 mass pct. P, 0.20 mass pct. C and constant mass percent ratio P/C of 2 were investigated. In the latter section, HT-LSCM observations were linked with DSC signals to optically identify present phase stabilities. Particularly at [pct P] < 1, significant differences between performed measurements and calculated phase equilibrium temperatures using thermodynamic assessments from the literature were identified. In all ternary sections, the experiments indicate less influence of P on the hypo-peritectic range compared to the thermodynamic calculations.

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Thermodynamic Reoptimization of the Fe-P System

Cited by 13 publications

References 19 publications

Critical Evaluation and Thermodynamic Re-Optimization of the Si–P and Si–Fe–P Systems

Critical Evaluation and Thermodynamic Re-Optimization of the Si–P and Si–Fe–P Systems

Reductive Heating Experiments on BOF-Slag: Simultaneous Phosphorus Re-Distribution and Volume Stabilization for Recycling

Experimental Study of High Temperature Phase Equilibria in the Iron-Rich Part of the Fe-P and Fe-C-P Systems

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