Hyper-cooling limit, heat of fusion, and temperature-dependent specific heat of Fe-Cr-Ni melts. (November 2019) - Jeon, Sangho
Highlights: Enthalpy-related properties of six Fe0.72 Cr w Ni(0.28− w ) melts were measured using ESL. The hypercooling limit and heat of fusion of the Fe0.72 Cr w Ni(0.28− w ) melts were estimated as a function Cr concentration. A new method was developed to predict the temperature dependence for specific heat of undercooled melts. The C p of the Fe0.72 Cr w Ni(0.28− w ) melts increases in the undercooled region. Abstract: Thermophysical properties of Fe-Cr-Ni melts are studied using electrostatic levitation and rapid solidification techniques. Six hypoeutectic Fe0.72 Cr w Ni(0.28− w ) alloys with a Cr/Ni ratio of around 0.8 were melted and solidified at different degrees of undercooling. From the observed relationship between the undercooling and thermal plateau time, the hyper-cooling limit and heat of fusion of Fe0.72 Cr w Ni(0.28− w ) melts are determined as a function of Cr mass fraction. A ratio of specific heat and total hemispherical emissivity of the Fe-Cr-Ni melts is calculated using the time-temperature profiles. A new method is presented to evaluate the temperature dependence of specific heat for undercooled melts and applied to this alloy family.