采用拉伸实验、电镜观察、化学相分析、X射线衍射等方法，定性定量地研究了700 MPa级高钛高强度热轧带钢力学性能分布特点和Ti在钢中析出行为的关系。结果表明，钢卷纵向力学性能分布不均，钢卷中部屈服强度大于外部约89 MPa；钢卷中部Ti的析出率明显高于外部；钢卷中部碳氮化物析出相中细小颗粒的比例（即空间弥散度）明显高于外部，析出相中60 nm以下颗粒的质量分数是外部的2.42倍。经计算，得到中部和外部10 nm以下Ti的碳氮化物析出强化量差为38 MPa，小于10 nm细小粒子的强化作用显著，是造成钢卷中部和外部二者强度差别的重要原因。
The relationship between precipitation of Ti and mechanical properties of hot rolled high strength steel was studied by means of qualitative and quantitative tests, such as tensile test,SEM,TEM and chemical phase analysis. It was found that the strength of the coil middle part is higher than that of the outer part by about 89 MPa. The results of chemical phase analysis indicate that the percentage of precipitated Ti and the proportion of the fine carbonitride precipitates in the coil middle part are higher than that of outer part.For example, the mass percentage of fine precipitates(＜60 nm) is 1.42 times higher than that of outer part. The contribution of carbonitride of Ti smaller than 10 nm to precipitation strengthing in the coil middle part is higher than that of outer part by about 38 MPa. It comes to a conclusion that the unequal Ti precipitation in different parts is the major reason that causes property nonuniformity of steel coil.
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