Time Dependent Effects in Surface Tension Measurements of an Industrial Fe‐alloy

Wunderlich, R.; Fecht, Hans‐Jörg; Schick, M.; Egry, Iván

doi:10.1002/srin.201000156

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…Due to the lower surface tension of Si as compared to that of Fe, Cr, and Mo, Si can be considered as surface active element. The model of Egry 33 for an Fe‐0.40at%Si alloy gives 34 σ ( T liq ) = 1.80 Nm −1 which is close to the value measured in the ground based experiment. Thus, the initial Si content of the alloy of 0.5 at% can not account for the reduced surface tension observed in the parabolic flight experiment.…”

Section: Resultssupporting

confidence: 83%

Thermophysical Properties of a Fe‐Cr‐Mo Alloy in the Solid and Liquid Phase

Wunderlich

Fecht

Egry

et al. 2011

steel research int.

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Results of a thermophysical characterization of a Fe‐Cr‐Mo alloy in the solid and liquid phases are reported. Methods applied include calorimetry, dilatometry; the laser flash technique for thermal diffusivity measurement and ultrasound pulse echo for the measurement of the room temperature sound velocities and elastic constants. Density in the liquid phase and surface tension were measured by optical dilatometry and by the oscillating drop method on electromagnetic levitated specimen. In addition, surface tension and viscosity were measured by the oscillating drop method on board parabolic flights under reduced gravity conditions. The methods applied and results obtained are presented. This work represents a collaborative effort, including round robin measurements in different laboratories for a characterization of the basic thermophysical properties needed for process simulation.

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Section: Resultssupporting

confidence: 83%

Thermophysical Properties of a Fe‐Cr‐Mo Alloy in the Solid and Liquid Phase

Wunderlich

Fecht

Egry

et al. 2011

steel research int.

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“…8. A negative slope of the surface tension versus temperature is found by Wunderlich et al [39] in Fe-C binary with a negligible amount of surface active elements (sulfur). The difference of the data of the present work to the literature for all three independent methods cannot be interpreted in terms of variation in the chemical composition.…”

Section: Discussionmentioning

confidence: 78%

“…Fig. 8 Results of the surface tension measurements for AISI 304 steel and the literature data of Brooks et al [9], Matsumoto et al [33], and Wunderlich et al [39]…”

Section: Discussionmentioning

confidence: 84%

Surface tension and density data for Fe–Cr–Mo, Fe–Cr–Ni, and Fe–Cr–Mn–Ni steels

et al. 2015

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The temperature dependence of surface tension and density for Fe-Cr-Mo (AISI 4142), Fe-Cr-Ni (AISI 304), and Fe-Cr-Mn-Ni TRIP/TWIP high-manganese (16 wt% Cr, 7 wt% Mn, and 3-9 wt% Ni) liquid alloys are investigated using the conventional maximum bubble pressure (MBP) and sessile drop (SD) methods. In addition, the surface tension of liquid steel is measured using the oscillating droplet method on electromagnetically levitated (EML) liquid droplets at the German Aerospace Centre (DLR, Cologne). The data of thermophysical properties for Fe-Cr-Mn-Ni is of major importance for modeling of infiltration and gas atomization processes in the prototyping of a ''TRIP-Matrix-Composite.'' The surface tension of TRIP/TWIP steel increased with an increase in temperature in MBP as well as in SD measurement. The manganese evaporation with the conventional measurement methods is not significantly high within the experiments (D Mn \ 0.5 %). The temperature coefficient of surface tension (dr/dT) is positive for liquid steel samples, which can be explained by the concentration of surface active elements. A slight influence of nickel on the surface tension of Fe-Cr-Mn-Ni steel was experimentally observed where r is decreased with increasing nickel content. EML measurement of high-manganese steel, however, is limited to the undercooling state of the liquid steel. The manganese evaporation strongly increased in excess of the liquidus temperature in levitation measurements and a mass loss of droplet of 5 % was observed.

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“…To develop and improve existing casting models, thermophysical property data needs to be collected. In several parabolic flight campaigns, the surface tension, viscosity, and density of a variety of steel grades were investigated, [49,62,63] together with groundbased measurements for thermophysical properties in the solid-state. [63] Stainless steels based on the Fe-Cr-Ni alloy system are common materials; however, these alloys are very interesting for the study of competing nucleation kinetics of different phases.…”

Section: Alloy Selectionmentioning

confidence: 99%

Investigating Thermophysical Properties Under Microgravity: A Review

Mohr

Fecht

2020

Adv Eng Mater

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The advancement of metallic alloys is generally driven by alloy development, but furthermore requires the development of suitable production and processing routines. Almost all metallic products are formed through the solidification processing from the liquid phase. Although the solid-state is not influenced by gravitational effects, the processing of liquids is strongly impacted by earth's gravity-this influences interface phenomena, momentum, heat, and mass transport and, consequently, the solidification events. Experiments on liquid metallic alloys in microgravity avoid these influences and therefore allow benchmark experiments. This allows, for example, to obtain reliable thermophysical properties, improve the understanding of nucleation, phase selection, crystal growth, and other basic features of the liquid phase and the liquid-solid transition. The basic methodology, as well as a number of recent results obtained in the long-duration microgravity environment on board the international space station, are presented and discussed.

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Time Dependent Effects in Surface Tension Measurements of an Industrial Fe‐alloy

Cited by 4 publications

References 30 publications

Thermophysical Properties of a Fe‐Cr‐Mo Alloy in the Solid and Liquid Phase

Thermophysical Properties of a Fe‐Cr‐Mo Alloy in the Solid and Liquid Phase

Surface tension and density data for Fe–Cr–Mo, Fe–Cr–Ni, and Fe–Cr–Mn–Ni steels

Investigating Thermophysical Properties Under Microgravity: A Review

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