Modeling of microstructure evolution and mechanical properties during hot-strip rolling of Nb steels  

作　　者：Yunbo Xu Yongmei Yu Xianghua Liu Cruodong Wang 

机构地区：[1]State Key Laboratory of Rolling and Automation, Northeastem University, Shenyang 110004, China

出　　处：《Journal of University of Science and Technology Beijing》2008年第4期396-401,共6页北京科技大学学报（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China (No.50504007, No.50474086, and No.50334010).

摘　　要：An integrated metallurgical model was developed for Nb steels to predict the microstructure evolution and mechanical properties during the hot-strip rolling and cooling process. On the basis of the industrial data, the transformation kinetics, strength, and elongation rate were evaluated for different chemical compositions and processing parameters. The yield strength and tensile strength increase with increasing Nb content or decreasing finishing temperature. The bainite distributed in finer ferrite matrix, which is produced at relatively low coiling temperatures, can greatly increase the strength of steel, especially tensile strength, thereby decreasing the yield ratio. A reasonable agreement was found between the predicted and measured results. It indicates that the present models can be used to simulate the actual production process.

关 键 词：hot-strip rolling TRANSFORMATION MICROSTRUCTURE mechanical properties grain size 

分 类 号：TG142[一般工业技术—材料科学与工程] TG335.11[金属学及工艺—金属材料]