钛铌微合金化钢强韧化机理研究  

Study on Strengthening and Toughening Mechanism of Ti and Nb Micro-alloyed Steel

作　　者：甘晓龙[1] 岳江波[1] 杜涛[1] 闻臻[1] 陈子宏[1] 张青[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《热加工工艺》2013年第22期89-91,94,共4页Hot Working Technology

摘　　要：用真空感应炉冶炼了含0.041%Nb和0.125%Ti的微合金化钢,进行了轧制和拉伸试验,利用OM、TEM分析了钢的显微组织、第二相析出粒子形貌和尺寸等。结果表明,实验钢种的力学性能为屈服强度568 MPa、抗拉强度672 MPa和伸长率22.8%。该钢强度提高有两个原因,第一是由微合金元素的碳氮析出物阻止晶粒长大而得到的细小晶粒的细晶强化作用;第二是由基体中纳米级析出的(Nb,Ti)(C,N)粒子阻碍位错运动而起到的析出强化作用。结果表明,在普通C-Mn钢中添加0.041%Nb和0.125%Ti可提高钢材的力学性能,而且可通过添加Ti代替部分Nb起到强化作用,以降低生产成本。A 0.041% Nb and 0.125% of Ti micro alloying steel was refined in vacuum induction furnace and rolled on two-high hot mill. The tensile tests were conducted. The microstructure, morphology and size of precipitates were analyzed by OM and TEM. The results show that the mechanical property of the steel is that the yield strength and tensile strength is 568 MPa and 672 MPa, respectively, and the elongation rate is 22.8%. There are two reasons for the strength increase of steel. The precipitates of micro-alloyed elements can prevent the growth of grain, which can lead to the fine grain and the fine-grain strengthening. The nanometer scale （Nb, Ti）（C, N） compound precipitates block dislocation motion, which can cause the precipitation strengthening.The test results prove that the mechanical properties of plain C-Mn steel can be remarkablly increased by the addition of 0.041%Nb and 0.125% of Ti. The addition of Nb and Ti can increase the mechanical properties, so that the production cost of high strength steel can be reduced by adding Ti instead of Nb.

关 键 词：Ti-Nb微合金化 (Nb袁Ti)(C袁N)复合析出 细晶强化 析出强化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]