Stability of a plain carbon steel in a temperature gradient
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Stability of a Plain Carbon Steel in a Temperature Gradient B. S. LIM AND J. P. STARK Operation of alloy materials at high temperatures usually involves high temperature gradients as well, which causes the microstructure change responsible for the deterioration of the high temperature mechanical properties. For the iron-carbon system, several studiesl-Shave been accomplished as to the carbon movement under the temperature gradient. For 3,-iron, Shewmon 2 found that Q*(3'-Fe), the heat of transport of carbon, is negligible up to about 950 °C, and for a-iron, he demonstrated ~ that the carbon migrated in the form of spheroidite to the hot end of a sample. However, similar experiments carried out by Shelton and Stark 4,5 showed, interestingly, no major redistribution of carbon in a-Fe under the conditions seemingly as severe as those of Shewmon's. Stark 6-1° subsequently developed a series of theoretical descriptions for the microstructure evolution of the second phase under the applied field. According to Stark 9, the differences in the above two experiments in c~-iron are based on the influence of particle size and flux discontinuities and the differing results are understandable. As a consequence B. S. LIM is Graduate Student, and J. P. STARK is Professor, The University of Texas at Austin, Austin, TX, 78712. Manuscript submitted December 15, 1980.
ISSN 0360-2133/81/0413-0688500.75/0 © 1981 AMERICAN SOCIETY FOR METALS AND THE METALLURGICAL SOCIETY OF
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