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The amount and composition of binary and ternary eutectics in the structure of high-manganese steels as well their crystallization temperature were estimated by the proposed model which was developed on the basis of the Scheuer’s and Schroeder’s equations . For experimental verification of the calculation results, about 40 bars of 40 mm diameter by different content of elements, wt.% [C] = 0.2–1.6, [P] = 0.02–0.31, and [Mn] = 12–14, were produced by melting with different rate of crystallization. It was shown that the higher the crystallization rate, the fewer eutectics were found in the structure of bars at the same content of carbon. Moreover the amount of binary eutectic is mainly determined by the carbon, while the phosphorus mainly increases the amount of ternary eutectic in the steel. By transmission electron microscopy (TEM) of replicas, the composition of ternary eutectic corresponds to γ + (Fe, Mn)3C + (Fe, Mn)3P with content of carbon of 1.4 wt.% and phosphorus of 7.3 wt.%. Estimated crystallization temperature of binary eutectic γ + (Fe, Mn)3C was 1510–1530 K, and the ternary eutectic 1250 K.
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- The Formation of Eutectic Phases at the Crystallization of High-Manganese Steel
- Chapter 11
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