中厚钢板回温轧制温度场的数值模拟和试验

Numerical simulation of temperature field and experiment during temperature-reverting rolling process of heavy steel plate

采用有限元模型,对中厚钢板回温轧制(TRRP,Temperature-Reverting Rolling Process)工艺时的温度场进行了数值模拟,分析水流密度对表层超细晶形成的影响,并在实验室对回温轧制获得的钢板性能进行了评价。结果表明,试验钢获得超细晶的临界冷却温度为580℃;给定回温温度时,随着水流密度增加,冷却时间降低,钢板表层冷却到临界温度以下的厚度增加;与传统TMCP(Thermo-Mechanical Control Process)工艺相比,TRRP工艺下精轧时,钢板内部温度更高,意味着大压下量轧制更容易进行。在实验室进行的TRRP轧制试验,得到了表层超细晶钢,提高了力学性能。

Numerical simulation of temperature field of tested heavy steel plate during water cooling and reverting process of TRRP was conducted by finite element method. The effect of water flow density on formation of ultra-fine grains in the steel was analyzed.Furthermore,properties of the plate by TRRP in laboratory were evaluated. The results show that critical cooling temperature to obtain surface with ultra-fine grains for the steel is 580 ℃. For a given reverting temperature,the depth of surface layer cooled to critical temperature increases by the increasing of water flow density. Comparing with traditional TMCP process,the inner temperature of the steel plate during finish rolling is higher by TRRP process. It indicates that large reduction rolling is easier to proceed. Plate of surface layer with ultra-fine grains is obtained by TRRP rolling experiment conducted in laboratory,and the mechanical properties are enhanced.