3 research outputs found
Surface tension and density data for Fe–Cr–Mo, Fe–Cr–Ni, and Fe–Cr–Mn–Ni steels
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
(DMn\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