IMPROVED PROCESSING FOR MICROSTRUCTURES AND MECHANICAL PROPERTIES OF A COMMERCIAL PIPELINE STEEL
来源期刊：Acta Metallurgica Sinica2005年第2期
论文作者：Y.S.Li M.C.Zhao K.Yang Y.C.Wang
Key words：hot-deformation simulation; thermo-mechanical control processing; acicular ferrite dominated microstructure;
Abstract: The transformation productions of hot-deformation simulation experiments were investigated us ing a Gleeble-1500 hot simulator for a commercial pipeline steel. Based on the investigation results, the improved thermo-mechanical control processing (TMCP) schedules containing a two stage multi-pass controlled rolling coupled with moderate cooling rates were applied to hot rolling experiments and acicular ferrite dominated microstructure was obtained. Microstructures and mechanical properties of hot rolled plates were related to TMCP processing, and regression equations describing the relation between processing parameters and mechanical properties in the current TMCP were developed, which could be used to predict mechanical properties of the experimental steel during commercially processing. It was found that with an increase in cooling rate after hot rolling, grain size in the microstructure became smaller, the amount of polyg onal ferrite decreased and acicular ferrite increased, and accordingly mechanical properties increased.
Y.S.Li1，M.C.Zhao2，K.Yang2，Y.C.Wang1
(1.School of Material & Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2.Intstiute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China)
Abstract:The transformation productions of hot-deformation simulation experiments were investigated us ing a Gleeble-1500 hot simulator for a commercial pipeline steel. Based on the investigation results, the improved thermo-mechanical control processing (TMCP) schedules containing a two stage multi-pass controlled rolling coupled with moderate cooling rates were applied to hot rolling experiments and acicular ferrite dominated microstructure was obtained. Microstructures and mechanical properties of hot rolled plates were related to TMCP processing, and regression equations describing the relation between processing parameters and mechanical properties in the current TMCP were developed, which could be used to predict mechanical properties of the experimental steel during commercially processing. It was found that with an increase in cooling rate after hot rolling, grain size in the microstructure became smaller, the amount of polyg onal ferrite decreased and acicular ferrite increased, and accordingly mechanical properties increased.
Key words:hot-deformation simulation; thermo-mechanical control processing; acicular ferrite dominated microstructure;
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