20MnSi钢筋冷却的淬透层深度

Quenched Depth of 20MnSi Steel Bar in the Process of Controlled-Cooling

通过数值方法求解20MnSi钢筋在线冷却过程中的温度场,进而求得组织场,并分析了各控冷工艺参数对20MnSi钢筋在线冷却过程中的淬透层深度的影响.结果表明:组织场的实验结果与计算结果符合较好,可以通过调整控冷工艺参数控制淬透层深度,为得到高强钢筋需要增大冷却水量,降低冷却水温;钢筋端面单元剖分的粗细会影响计算结果,使淬透层深度与控冷工艺参数之间呈阶跃式变化。

By means of numerical method,the temperature field and then the structure field of 20MnSi steel bar in the process of controlled-cooling was simulated. The effect of the process parameters on the quenched depth was discussed. The results show that the calculated results is in accordance with the experimental results for the structure field, and the quenched depth can be controlled by changing the cooling process parameters. The strength of the steel bar increases with increasing the amount of cooling water and lowering the temperature of cooling water. In addition, it is found that the element size meshed on the section of the steel bar has significant effect on the simulation results, and makes it the step change of the relation trend between the quenched depth and the process parameter of controlled- cooling,