Nb、V、N微合金化热轧TRIP钢的动态连续冷却相变  

Dynamic continuous cooling transformation of Nb,V and N microalloyed hot-rolled TRIP steel

作　　者：高绪涛 张元 李强[1] 李熙 张明明 Gao Xutao;Zhang Yuan;Li Qiang;Li Xi;Zhang Mingming(Sehool of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;Subway Operation Technology Center,Beijing Mass Transit Railway Operation Co.,Ltd.,Beijing 102208,China;,Shanghai Eleetric Nuelear Power Equipment Co.,Ltd.,Shanzhai 201306.China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]北京市地铁运营有限公司地铁运营技术研发中心,北京102208 [3]上海电气核电设备有限公司,上海201306

出　　处：《金属热处理》2018年第9期1-6,共6页Heat Treatment of Metals

基　　金：山东省科技重大专项(2015ZDXX0102A01)

摘　　要：采用Gleeble-3500热模拟机测定了C-Si-Mn-Nb、C-Si-Mn-Nb-V、C-Si-Mn-Nb-V-N这3种成分热轧TRIP钢在变形后以不同速率冷却时的热膨胀数据,结合不同冷速下的显微组织,绘制3种成分热轧TRIP钢动态CCT曲线。结果表明：C-Si-Mn-Nb与C-Si-MnNb-V试验钢在冷速大于30℃/s后,几乎没有铁素体生成,基体组织主要是贝氏体和马氏体;而C-Si-Mn-Nb-V-N试验钢当冷速达到60℃/s仍然可见细小的铁素体,并且多分布在奥氏体的三叉界和晶界处。与C-Si-Mn-Nb和C-Si-Mn-Nb-V试验钢的动态CCT曲线相比,随着冷速的增大,C-Si-Mn-Nb-V-N试验钢铁素体相区左移,贝氏体相区变小。The thermal expansion data of three kinds of hot-rolled TRIP steel of C-Si-Mn-Nb,C-Si-Mn-Nb-V and C-Si-Mn-Nb-V-N with different cooling rates after deformation were measured by Gleeble-3500 thermal simulator,and the dynamic CCT curves of the three kinds of hot-rolled TRIP steel were drawn by combining the microstructure at different cooling rates. The results show that there is almost no ferrite formation in the C-Si-Mn-Nb and C-Si-Mn-Nb-V tested steel when the cooling rate is greater than 30 ℃/s,and the matrix structure is mainly bainite and martensite. While there are fine ferrite grains observed in C-Si-Mn-Nb-V-N steel when the cooling rate reaches 60 ℃/s,which distribute at the triple junction or grain boundaries of austenite. Compared with the dynamic CCT curves of C-Si-Mn-Nb and C-Si-Mn-Nb-V tested steel,with the increase of the cooling rate,the phase region of the ferrite phase in the C-Si-Mn-Nb-V-N shifts left and the bainite phase area becomes smaller.

关 键 词：热轧TRIP钢 Nb、V、N微合金化 连续冷却转变曲线 铁素体 贝氏体 马氏体 

分 类 号：TG115.21[金属学及工艺—物理冶金]