Kinetics of austenite grain growth in medium-carbon niobium-bearing steel |
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Authors: | Ying-li ZHAO Jie SHI Wen-quan CAO Mao-qiu WANG Gang XIE |
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Institution: | (1) School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China;(2) Dongbei Special Steel Group, Dalian, 116031, China; |
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Abstract: | In order to locate a reasonable heating system, the austenite grain growth behavior of Nb microalloyed medium carbon steel
has been experimentally studied at various austenitizing temperatures and for different holding times. It is indicated that
austenite grain growth increases with increasing austenitizing temperatures and holding times. Particularly when the austenitizing
temperature was above 1100 °C, austenite grains grew rapidly, and an abnormal austenite grain growth was observed. When the
austenitizing temperature was lower than 1100 °C, austenite grain size and growth rate were small. The activation energy of
grain growth in the tested steel is 397 679.5 J/mol. To ensure an absence of coarse grains in microstructures, the heating
technology of the tested steel should be controlled for 1 h at 1100 °C. The relationships of austenite average grain size
with soaking temperature and time of tested steel were obtained by mathematical calculation, and austenite average grain size
was found to be in agreement with the measured size for different holding times. |
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