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以首钢热轧72AU2带钢卷取后的冷却过程为研究对象,借助有限元模拟软件ABAQUS采用顺序耦合的方式对钢卷卷取后的温度场及热应力场进行了研究。首先,对热轧钢卷冷却过程进行传热分析,建立了热轧钢卷冷却过程中的温降模型。模拟计算表明,钢卷在冷却过程进行约50 min后达到温差最大值206℃,随着冷却进行冷却最慢点从径向靠近内径44%处移动到了26%处。随后模拟得到了钢卷冷却过程中的热应力场状态,冷却过程中钢卷最大的Mises应力为680 MPa,冷却后最大残余应力为382 MPa;通过观察钢卷各部位的组织,得出钢卷冷却后边部珠光体含量高于心部,导致不均匀膨胀。
Taking the cooling process of 72AU2 hot rolled strip after hot rolling in Shougang as the research object, the temperature field and the thermal stress field of the coiled steel coil were studied by means of sequential coupling with finite element simulation software ABAQUS. First, the heat transfer analysis of the cooling process of hot-rolled coil was established, and the temperature drop model of the hot-rolled coil during cooling was established. The simulation results show that the coil reaches 206 ℃, which is the maximum temperature difference about 50 minutes after the cooling process, and the slowest point decreases from 44% at the radial direction to 26% at the slowest point with cooling. Afterwards, the thermal stress field in the cooling process of the steel coil was simulated. The maximum Mises stress of the steel coil during cooling was 680 MPa and the maximum residual stress after cooling was 382 MPa. By observing the microstructure of each part of the steel coil, After cooling, the pearlite content is higher than the center of the heart, leading to uneven expansion.