Papers by Keyword: Liquidus

Abstract: This paper presents a methodology in order to predict A1, solidus and liquidus temperatures using a relatively simple approach. The proposed approach is based on the combined use of the thermodynamic software Thermo-Calc and the composite centered design of experiments (DOE) method. Four important alloying elements (C, Ni, Mn and Cr) were considered in the DOE. The impact of each alloying element on the transformation temperatures was determined and discussed. It was found that carbon has the most important impact on solidus and liquidus whereas Ni, Mn, and Cr have a significant impact on A1. The proposed models were generated using Analysis of Variance (ANOVA) method. A good agreement between experimental and predicted results was found with a maximum error of 1.1 % for transformation temperatures. Furthermore, the proposed models were validated using a large amount of experimental data published in the literature with a maximum error equal to 7.8 %.

Abstract: This paper provides a new lead-free alloys with Sn, Ni, P and Mg. The liquidus of Sn-Ni alloys, Sn-P alloys, and Sn-Mg alloys was tested. And each of element affection was analyzed. The wettablity of Sn-Ni alloys ,Sn-P alloys, and Sn-Mg alloys was tested. And each of element affection was analyzed. In addition, the comparison of the liquidus and wettablity of different alloys was gave.

Abstract: Nickel-base alloys with different boron contents were prepared by vacuum arc furnace. The effect of the boron contents to metallography was characterized simultaneously by XRD and SEM with EDS part. The thermal behavior was analyzed by DSC curves which mainly represents the eutectic temperature of alloys. The Vickers hardness and ball-on-flat wear test were carried out to reveal the relationship between metallographic phase formation and wear resistance. The results indicated that main composites are eutectic Ni-Cr as matrix and CrB, Ni₃B as precipitated phase. A considerable amount of dislocation and stacking faults exist in the specific orientation (200) of Ni₃B. 2.0~4.0%B alloys melt at 1060oC, while the boride-poor alloy melts at 1085oC. 3.0~4.0%B alloys performed the best on wear resistance. Wear volume reduces along with increasing hardness at the beginning, and then keeps invariant. Borides are main reinforcing phases, which affects hardness and wear resistance greatly.

Abstract: To provide essential data for an efficient utilization of vitrified bottom ash slag, the thermodynamic properties of the CaO-Al₂O₃-SiO₂-FeO_x-MgO-Na₂O oxide system is highly required. As one of the related oxide subsystems, the equilibrium phase relations and liquidus of CaO-SiO₂-FeO_x-Al₂O₃ system is of great significance to interpret and predict the thermodynamic properties in multi-component oxide systems. In this paper, phase diagrams for the CaO-Al₂O₃-FeO_x and SiO₂-Al₂O₃-FeO_x systems were calculated by using CALPHAD method with FactSage program. The liquid phase area changed with changing oxygen partial pressure from 1Pa to 10^-3Pa and temperature from 1673K to 1773K. The equilibrium phase relations of CaO-Al₂O₃-FeO_x and SiO₂-Al₂O₃-FeO_x systems were discussed.

Abstract: Using the ESTPHAD (Estimation of Phase Diagrams) method, the liquidus and solidus curves in the equilibrium phase diagram can be created by thermodynamic based equations. By these determined equations, the liquidus or solidus temperatures as a function of concentration can be calculated with the required precision. The main advantages of the ESTPHAD method are as follows: the parameters of functions can be calculated simply, it gives a precise result and the calculation time is short. This paper shows the reconstruction of the liquidus curves of the CaO-Al2O3 phase diagram (0-60 wt% Al2O3 range) by using the ESTPHAD method on the basis of the measured data. The divergences between the measured and calculated (ESTPHAD) data are less than the given measurement error (±10 K).