Abstract
Brittle pro-eutectoid cementite that forms along prior-austenite in hypereutectoid steels is deleterious to mechanical properties. The optimum process parameters which suppress the formation of pro-eutectoid cementite in hypereutectoid steels with carbon content in the range of 0.8%–1.3% in mass fraction, were investigated. Pro-eutectoid cementite formation is effectively hindered by increasing the deformation temperature and decreasing the amount of strain. Transformation at lower temperatures close to the nose of the cooling-transformation diagram also reduces the tendency of the formation of pro-eutectoid cementite. Control of prior-austenite grain size and grain boundary conditions is important. Due to larger number of nucleation sites, finer prior-austenite grain size results in the acceleration of transformation to pro-eutectoid cementite. However, large prior-austenite and straight boundaries lead to less nucleation sites of pro-eutectoid cementite. The cooling rate and carbon content should be reduced as much as possible. The transformation temperature below 660 °C and the strain of 0.5 at deformation temperature of 850 °C are suggested.
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Foundation item: Project(51222405) supported by the National Science Foundation for Outstanding Young Scholars of China, Project(51034002) supported by the National Natural Science Foundation of China; Project(132002) supported by the Fok Ying Tong Education Foundation, China; Project(N120502001) supported by the Basic Scientific Research Operation of Center University of China
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Guan, Rg., Zhao, Zy., Chao, Rz. et al. Effects of deformation parameters on formation of pro-eutectoid cementite in hypereutectoid steels. J. Cent. South Univ. 21, 1256–1263 (2014). https://doi.org/10.1007/s11771-014-2060-y
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DOI: https://doi.org/10.1007/s11771-014-2060-y