Effect of Austenitizing Temperature on Pearlite Transformation of a Medium-Carbon Steel


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Pearlite transformation is a necessary step in the production of ultra-high strength wires and nanostructured bainitic steels. The initial austenite grain size has an important influence on the bainite and pearlite transformation. The effect of austenitizing temperature on the austenite-to-pearlite transformation in a medium-carbon steel was investigated by using a Gleeble 1500 simulator. The initial austenite grains coarsened from 33.7 to 68.5 μm when the austenitizing temperature increased from 850°C to 1100°C. The phase-volume percentage and interlamellar spacing of the pearlitic microstructure decreased from 86.6% to 5.2%, and from 114 nm to 110 nm, respectively, in the same austenitizing temperature range. The starting temperature of the pearlite transformation was inversely proportional to the austenitizing temperature. The pearlite-transformation temperature range (43–48°C) did not change visibly with austenitizing temperature. The Vickers hardness of the transformed microstructure (pearlite + martensite) was proportional to the austenitizing temperature.

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G. Wu

The State Key Laboratory of Refractories and Metallurgy, International Research Institute for Steel Technology, Wuhan University of Science and Technology

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Email: 1528241169@qq.com
中国, Wuhan

K. Wu

The State Key Laboratory of Refractories and Metallurgy, International Research Institute for Steel Technology, Wuhan University of Science and Technology

Email: 1528241169@qq.com
中国, Wuhan

O. Isayev

The State Key Laboratory of Refractories and Metallurgy, International Research Institute for Steel Technology, Wuhan University of Science and Technology

Email: 1528241169@qq.com
中国, Wuhan

O. Hress

The State Key Laboratory of Refractories and Metallurgy, International Research Institute for Steel Technology, Wuhan University of Science and Technology

Email: 1528241169@qq.com
中国, Wuhan

S. Yershov

The State Key Laboratory of Refractories and Metallurgy, International Research Institute for Steel Technology, Wuhan University of Science and Technology

Email: 1528241169@qq.com
中国, Wuhan

V. Tsepelev

Center for Liquid Metal Physics, Ural Federal University

Email: 1528241169@qq.com
俄罗斯联邦, Yekaterinburg

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