Nb-V-Ti低碳微合金钢的热变形加工图及其应用  

Processing map and its application of Nb-V-Ti low carbon microalloyed steel

作　　者：向嵩[1,2] 刘国权[3] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550003 [2]贵州省材料结构与强度重点实验室,贵阳550003 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料科学与工艺》2011年第1期26-31,共6页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50901022);贵州省优秀科技教育人才省长基金资助项目(200815)

摘　　要：为了优化Nb-V-Ti低碳微合金钢的变形工艺参数,利用Gleeble-1500热/力模拟实验机对其进行了热压缩实验,得到热加工图用于研究热变形行为.研究发现,加工图中存在两个动态再结晶峰区及失稳区:峰区Ⅰ:峰值对应的变形温度和变形速率分别为1000℃,2 s-1,峰值效率21%;峰区Ⅱ:变形温度1050℃,变形速率0.01～0.001 s-1,峰值效率45%.将加工图与CSP生产工艺参数进行对比,合理解释了CSP生产过程中出现混晶的现象.因此,动态材料模型加工图可作为研究新材料变形参数的有力工具.To optimize deformation parameters,the hot deformation behavior of Nb-V-Ti microalloyed steel was studied by hot compressing tests on a Gleeble-1500 stimulator.The processing map of the steel was developed on the basis of the principle of Dynamic Material Modeling（DMM）.The results exhibit that there are two peaks in the processing map： one is at the temperature of 1000 ℃ and strain rate of 2 s-1,and another is at 1050 ℃ and 0.01~0.001 s-1,and the peak efficiency of power dissipation of the two peaks is 21% and 45% respectively.The optical microstructure observations show that they represent two dynamic recrystallization domains.Compared with the parameters of compact strip product process,the phenomena of mixed grain in the microalloyed steel produced by CSP line can be explained by the map reasonably.The processing map is a useful tool in developing a new steel and optimizing hot deformation parameters.

关 键 词：低碳微合金钢 加工图 薄板坯连铸连轧 热变形 动态再结晶 

分 类 号：TG111.7[金属学及工艺—物理冶金]