退火时间对冷轧中锰TRIP钢组织和力学性能的影响  

Efect of annealing time on the microstructure and mechanical properties of a cold rolled medium-manganese TRIP steel

作　　者：尹鸿祥[1] 赵爱民[1] 赵征志[1] 李振[1] 汪志刚[1] 孙璐[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《北京科技大学学报》2013年第9期1158-1163,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(50904006);中央高校基本科研业务费专项(FRF-TP-10-001A);教育部博士学科点专项科研基金资助项目(20110006110007)

摘　　要：采用CCT-AY-Ⅱ型钢板连续退火机模拟分析了退火时间对中锰TRIP钢0.1C-7Mn组织性能的影响规律.利用扫描电镜、透射电镜、电子背散射衍射和X射线能量色散谱等研究了不同工艺下制备的0.1C-7Mn钢的微观组织和成分,利用X射线衍射法测量了残留奥氏体量,利用拉伸试验测试了其力学性能.0.1C-7Mn钢在650℃保温3 min退火后获得最佳的综合力学性能,其强度为1329 MPa,总延伸率为21.3%,强塑积为28 GPa·%.分析认为,0.1C-7Mn钢的高塑性是由亚稳奥氏体的TRIP效应和超细晶铁素体共同提供的,而高强度是由退火冷却过程中奥氏体转变的马氏体和拉伸变形过程中TRIP效应转变的马氏体的强化作用造成的.The effects of annealing time on the microstructure and mechanical properties of a cold rolled medium-manganese TRIP steel 0.1C-7Mn were analyzed on a CCT-AY-Ⅱ heat treatment system for thin steel sheet. The microstructure and composition of the steel obtained through different annealing processes were investigated by means of scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction, and energy dispersive X-ray spectroscopy. The amount of retained austenite in the steel was determined by X-ray diffraction analysis and the mechanical properties were measured by tensile testing. The steel annealed at 650 ℃ for 3 min has the best comprehensive mechanical properties, with the tensile strength of 1329 MPa, the total elongation of 21.3%, and the product of tensile strength and elongation of 28 GPa.%. It is believed that the high plasticity is provided by the TRIP effect of metastable austenite together with ultra-fine grained ferrite. The high strength is caused by martensite which is directly transformed from austenite in the cooling process during annealing and obtained during the tensile deformation attributed to the TRIP effect.

关 键 词：锰钢 冷轧 退火 微观组织 力学性能 汽车材料 

分 类 号：TG335.3[金属学及工艺—金属压力加工]