摘要
非调质钢具有优异的强度和塑性配合,因其无需进行淬火和回火热处理而被广泛应用于汽车、建筑和重型机械当中。其中,中大尺寸的非调质钢的最终力学性能主要依赖于产线上控轧控冷过程的组织调控,而冷却过程中的传热过程直接影响中大尺寸非调质钢的性能均匀性与生产效率。针对38MnVS6非调质钢轧制控制冷却过程中的传热行为,建立了冷却传热仿真模型,结合有限元法模拟中大尺寸(直径90 mm、100 mm、120 mm)非调质钢棒材在冷却过程中的温度场动态变化,模拟实际控制冷却127 m生产线布局中的6个不连续水冷和风冷段。通过有限元仿真获得的非调质钢控制冷却全过程的温度变化和温度场云图结果表明,棒材在水冷阶段的冷却过程可分为初始快速降温、汽化加速冷却和温度逐渐放缓3个阶段,水冷结束后在空气中冷却时芯部热量向表面传递。随着棒材尺寸增大,传热时间显著延长,表面与芯部温差扩大,冷却均匀性调控难度增加,可能影响最终组织性能。该研究揭示了冷却参数优化在提升温度和性能均匀性中的重要性。仿真结果与现场红外高温计测试吻合度较高,为非调质钢控轧控冷工艺的优化提供了理论依据和技术支持。
Non-quenched steels have excellent strength and plasticity and are widely used in automotive,construction,and heavy machinery because they do not require quenching and tempering heat treatment.The final mechanical properties of non-quenched steels depend on the structure control of controlled rolling and controlled cooling process in the production line,and the heat transfer process in the cooling process directly affects the performance uniformity and production efficiency of non-quenched steels.Aiming at the heat transfer behavior during controlled cooling of 38MnVS6 non-quenched steel rolling,a cooling heat transfer simulation model was established,and the dynamic change of temperature field of large and medium size(diameter 90 mm,100 mm,120 mm)non-quenched steel bar during cooling was simulated by finite element method.Simulation of 6 discontinuous water-cooled and air-cooled sections in the 127 m production line layout.The temperature change in the whole process of controlled cooling of non-quenched steel was obtained by finite element simulation.The results of the temperature field cloud map show that the cooling process of bar in the water-cooling stage can be divided into three stages:initial rapid cooling,accelerated vaporization cooling,and gradual slowing down of temperature.After the end of water cooling,core heat is transferred to the surface in air cooling.With the increase of bar size,the heat transfer time is significantly extended,the temperature difference between the surface and the core is enlarged,and the control difficulty of cooling uniformity is increased,which may affect the final microstructure properties.This study reveals the importance of cooling parameter optimization in improving temperature uniformity and performance uniformity.The simulation results are in good agreement with the field infrared pyrometer test,which provides theoretical basis and technical support for the optimization of the controlled rolling and cooling process of non-quenched steels.
作者
陈良勇
马为涛
宋仁伯
彭绍峰
戴观文
任鹏飞
Chen Liangyong;Ma Weitao;Song Renbo;Peng Shaofeng;Dai Guanwen;Ren Pengfei(Shijiazhuang Iron and Steel Co.,Ltd.,Shijiazhuang 050031,Hebei;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《河北冶金》
2026年第1期64-71,共8页
Hebei Metallurgy
基金
河钢集团重点科技项目计划(HG2023242)。
关键词
非调质钢
控轧控冷
传热
有限元
温度场
边界条件
反温
non-quenched steel
controlled rolling and cooling
heat transfer
finite element method(FEM)
temperature field
boundary condition
temperature inversion
