Typical Steel Heat Transfer In Controlled Cooling Process And Its Application

Steel plate and shaft is typical steels that usually applicated in the engineering. Whenafter rolling usually take the controlled cooling technology for reprocessing. Differentcooling rate will cause different transformation of the steel plate and shaft organization,which will ultimately affect the final mechanical properties of the steel plate and shaft.The integrated heat transfer coefficient on the surface is an important parameter whicheffect of cooling rate. So the integrated heat transfer coefficient on the surface of steelplate and shaft is one of the key content of the research in the process of controlledcooling.In this paper comprehensive research are carried on of heat transfer coefficient on thesurface of the steel plate and shaft. At present there are lots of methods solving theintegrated heat transfer coefficient on the surface, but compared with other methods, theinverse heat transfer method is more accurate. Therefore, in order to obtain the integratedheat transfer coefficient on the surface of steel plate and shaft, this paper adopt the inverseheat transfer method.Based on the plate specimen and shaft specimen as the research object, separatelycarries on the heating, air cooling, water cooling experiment, obtained under the conditionof the corresponding temperature curve. Then according to the inverse heat transfermethod, nonlinear estimation method and finite difference method, and considering theinfluence of phase change latent heat, got the integrated heat transfer coefficient on thesurface of the plate specimen and shaft specimen under the working condition of heating,air cooling, water cooling.In order to verify the accuracy of the integrated heat transfer coefficient on thesurface of the plate specimen and shaft specimen, different plate specimen and shaftspecimen are selected to carry on heating, air cooling, water cooling experiments. Andthen finite element model under the condition of heating, air cooling, water cooling basedon the the integrated heat transfer coefficient on the surface of plate specimens and shaftspecimen is established by the means of large finite element software. Temperature field under corresponding working conditions are simulatedAt last, in this paper the temperature field and thermal stress field under heating, aircooling, water cooling conditions of steel plate are simulated according to the obtain theintegrated heat transfer coefficient on the surface of plate specimen and shaft specimen.