Controlled undercooling of liquid iron in contact with Al2O3 substrates under varying oxygen partial pressures |
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Authors: | Martin E Valdez Pello Uranga Katsuhiro Fuchigami H Shibata Alan W Cramb |
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Affiliation: | (1) Present address: the Department of Materials Science and Engineering, Carnegie Mellon University, USA;(2) Tenaris/CINI, B2804MHA Campana, Argentina;(3) CEIT and TECNUN (University of Navarra), E-20018 Donostia-San Sebastian, Basque Country, Spain;(4) the Research and Development Lab., Nippon Steel Corporation at Oita, 870-0992 Oita, Japan;(5) the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 980-8577 Sendai, Japan;(6) Present address: the Department of Materials Science and Engineering, Carnegie Mellon University, 15213 Pittsburgh, PA;(7) Rensselaer Polytechnic Institute, 12180 Troy, NY |
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Abstract: | The objective of this study was to determine the conditions under which alumina can act as a heterogeneous nucleant to initiate
the solidification of undercooled liquid iron. The undercooling of a pure iron sessile droplet in contact with Al2O3 substrates was measured under controlled oxygen partial pressures by observing droplet recalescence. The experimental results
indicated that the undercooling of liquid iron, in contact with an Al2O3 substrate, did not have a unique value, varied from 0 °C to 290 °C, and was significantly affected by the oxygen content
of the gas phase and the degree of interaction between the oxide and the metal. Deep undercoolings are possible at low oxygen
potentials, provided the oxygen potential is such that substantial substrate decomposition does not occur. The measured undercooling
was a strong function of gas phase oxygen content and a maximum in undercooling of 290 °C was measured at PO2=10−19 atm. The variation in undercooling was related to the wetting of the substrate by the liquid metal, where the deepest undercoolings
occurred when the highest contact angle between the substrate and the liquid droplet was achieved. |
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