Investigation of (Cr,Co)7C3-fcc-graphite equilibrium in the temperature interval 1373 to 1473 K |
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| Authors: | Theérèse Sterneland Andreas Markström Susanne Norgren Ragnhild E. Aaune Seshadri Seetharaman |
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| Affiliation: | (1) Department of Material Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden;(2) KIMAB, Stockholm, Sweden;(3) Sandvik Tooling R&D, Stockholm, Sweden;(4) Department of Material Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden;(5) Present address: Outokumpu Stainless AB, Avesta, Sweden |
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| Abstract: | In the current study, the phase equilibria between fcc, graphite and M7C3 (M = Cr,Co) have been studied at 1373 °K, 1423 °K, and 1473 °K. The solubility of Co in the M7C3 phase and the solubility of Cr and C in the fcc phase have been determined by the high-temperature equilibration and quenching technique. Appropriate mixtures of Cr7C3 + Co or M7C3 + Co + C were equilibrated and subsequently quenched in liquid nitrogen. The quenched samples were characterized by X-ray diffraction and by metallographic examination. The studies were carried out on the samples to determine the homogeneity of the sample as well as the phases and their composition. From the results, the compositional regions of the three-phase triangle M7C3 + fcc + graphite could be accurately determined. The results show that the Co solubility in the Cr7C3 in the experimental temperature interval is higher than previous investigations performed at higher temperatures. |
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