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Effect of simulated thermomechanical processing on transformation behavior and microstructure of 82B steel

Journal of Iron and Steel Research International 2019年第1期26卷 69-77页

作者： He Wei Yin-li Chen Lan Su Di Tang Collaborative Innovation Cemer of Steel Technology University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing 100083China

The effects of loop-laying temperature and austenite deformation on the phase(ransformation behavior during continuous cooling,microstructure,and pearlite interlaminar spaci ng in 82B steels were *** and dynamic conti nu ous cooling transformation(CCT)diagrams were measured with a Gleeble-3500 thermal simulator,and the mechanisms governing changes in the initial temperature,initial time,and duration of the phase transformation zone were also analyzed and *** results show that CCT diagram shifted to the bottom right,the initial temperature of the phase transition decreased,the initial time of the phase transition increased,the duration of the phase transition increased,and the lamellar spacing of pearlite was finer as the loop-layi ng temperature in *** initial phase transition time decreased,and the phase transition duration first reduced,then increased,and finally decreased in the static condition and in the dynamic condition at 850℃as the cooling rate ***,the phase transition duration continuously decreased in the dynamic condition at 900℃.At a given loop-laying temperature,the lamellar spacing in pearlite was finer due to austenite deformation compared with the undeformed *** with the results shown in the dynamic CCT diagram,the corresponding phase diagrams of the static CCT diagram slightly shifted to the bottom ***,there was a clear lin ear relationship between the reciprocal of the lamellar spaci ng in pearlite and the average undercooling degree in the phase transformation zone.

关键词： 82B steel Phase transformation loop-laying temperature Austenite deformation Microstructure

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