Abstract
The growth of austenite from pearlite in high-carbon low alloy steel occurs with and without alloy element redistribution depending on the amount of superheating above the eutectoid temperature. The transition temperature of austenite growth (denoted PNTT) is calculated as a function of pearlite transformation temperature and subsequent holding time, which affect the degree of partitioning in pearlite, using experimental partition coefficients k θ/α of Mn, Cr, Co, Si, and Ni reported in the literature. PNTT is the highest in Cr-containing alloys which have the largest k θ/α in pearlite. Post-transformation aging, usually accompanied by cementite spheroidization, leads to a marked increase of PNTT in Mn and Cr alloys. PNTT of Ni alloy does not depend on pearlite transformation temperature because practically the formation of partitioned pearlite is severely limited in this alloy for kinetic reasons. Above PNTT, austenite growth occurs fast initially, but slows down in the order of ten seconds when the ferrite disappears, and the remaining small carbide particles dissolve very slowly under the control of alloy element diffusion.
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The support from the National Science Foundation of China (Grants 51471094) is gratefully acknowledged. M. Enomoto acknowledges the support on the Foreign Experts Recruitment Program of China Government.
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Manuscript submitted February 12, 2015.
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Yang, Z.N., **a, Y., Enomoto, M. et al. Effect of Alloying Element Partition in Pearlite on the Growth of Austenite in High-Carbon Low Alloy Steel. Metall Mater Trans A 47, 1019–1027 (2016). https://doi.org/10.1007/s11661-015-3272-y
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DOI: https://doi.org/10.1007/s11661-015-3272-y