Microstructural evolution and tensile properties of low-carbon steel with martensitic microstructure during warm deforming and annealing  

作　　者：Yuwei Gao Tianfu Jing Guiying Qiao Jinku Yu Tiansheng Wang Qun Li Xinyu Song Shuqiang Wang Hong Gao 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China [2]College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China

出　　处：《Journal of University of Science and Technology Beijing》2008年第3期245-249,共5页北京科技大学学报（英文版）

基　　金：the National Natural Science Foundations of China(Nos.50271060 and 50371074);the Natural Science Foundation of Hebei Province,China(No.503291).

摘　　要：For preparing large-scale nano-grained and ultrafine-grained steel sheets by warm rolling and annealing, the effects of deforming temperature on both the flow stress and the microstructure evolution of 09MnNiD steel with lath martensitic microstructure were studied by warm-compression test and transmission electron microscopy （TEM） observation. Thereafter, the steel with the lath martensitic structure was multi-pass warm-rolled and then annealed. TEM results indicate that nano-grained and ultrafine-grained steel sheets are formed by warm rolling at 400℃ and annealing at 400-600℃. In comparison with the as-warm-rolled specimen, the tensile strength at room temperature changes a little when the rolled samples are annealed below 450℃, and the tensile strength is greatly lowered as the annealing temperature increases to above 550℃.For preparing large-scale nano-grained and ultrafine-grained steel sheets by warm rolling and annealing, the effects of deforming temperature on both the flow stress and the microstructure evolution of 09MnNiD steel with lath martensitic microstructure were studied by warm-compression test and transmission electron microscopy （TEM） observation. Thereafter, the steel with the lath martensitic structure was multi-pass warm-rolled and then annealed. TEM results indicate that nano-grained and ultrafine-grained steel sheets are formed by warm rolling at 400℃ and annealing at 400-600℃. In comparison with the as-warm-rolled specimen, the tensile strength at room temperature changes a little when the rolled samples are annealed below 450℃, and the tensile strength is greatly lowered as the annealing temperature increases to above 550℃.

关 键 词：warm deformation MARTENSITE flow stress NANOMATERIALS mechanical properties 

分 类 号：TG156[金属学及工艺—热处理]