The solidification microstructure has an important effect on the mechanical properties of castings.Therefore,an FE (Finite Element) CA (Cellular Automaton) coupling model was developed for the simulation of solidifica...The solidification microstructure has an important effect on the mechanical properties of castings.Therefore,an FE (Finite Element) CA (Cellular Automaton) coupling model was developed for the simulation of solidification structure during the continuous casting process of 72A tire cord steel.In the model,the effect of phase transformation (l→g→a) during solidification was considered based on a thermodynamic database.The effect of electromagnetic stirring (EMS) was determined by increasing both the thermal conductivity and crystal formation rate in the liquid phase.The results show that the cooling curves and solidification structure calculated by this model agree well with the experimental results.The optimum pouring temperature range for tire cord steel casting was also discussed based on the present model.By comprehensive consideration of billet quality and smooth production,the pouring temperature should be controlled at about 1,495℃ under the casting conditions of the local plant in this study.展开更多
采用CAFE模型(Cellular automata finite element method)模拟第二代镍基高温合金CMSX4凝固过程中的晶粒生长,并探讨浇注温度和冷却速度对凝固组织的影响。结果表明:凝固开始时,首先在铸锭底部会形成一层取向随机的细小等轴晶,由于晶粒...采用CAFE模型(Cellular automata finite element method)模拟第二代镍基高温合金CMSX4凝固过程中的晶粒生长,并探讨浇注温度和冷却速度对凝固组织的影响。结果表明:凝固开始时,首先在铸锭底部会形成一层取向随机的细小等轴晶,由于晶粒间的竞争生长,晶粒数目减小,晶粒尺寸增大,?001?晶向与热流方向偏离角较大的晶粒逐渐被偏离角较小的晶粒淘汰。浇注温度的提高会使晶粒尺寸变大、晶粒数目变小,而冷却速度的升高却会使晶粒尺寸变小,与理论分析一致。展开更多
We mainly studied effects of nucleation parameters((35)T_(v,max) and(35)T_(s,max)) and superheat on solidification structure of ZG12 MnMoV low-alloy steel by integration of CAFE and experimentation. The result shows t...We mainly studied effects of nucleation parameters((35)T_(v,max) and(35)T_(s,max)) and superheat on solidification structure of ZG12 MnMoV low-alloy steel by integration of CAFE and experimentation. The result shows that grain dimension is not only related with nucleation parameters, but also with superheat. The smaller(35)T_(v,max) and(35)T_(s,max) get, the tinier grain turns. The lab experimentation on optimum parameter is conducted, the mean diameter of grain in lab test specimen is 153.2 μm, and the mean diameter calculated by CAFE model is 151.1 μm. The calculated solidification structure agrees with the experimental result in the main.展开更多
基金supported by the National Basic Research Program of China (grant No.2010CB630806)
文摘The solidification microstructure has an important effect on the mechanical properties of castings.Therefore,an FE (Finite Element) CA (Cellular Automaton) coupling model was developed for the simulation of solidification structure during the continuous casting process of 72A tire cord steel.In the model,the effect of phase transformation (l→g→a) during solidification was considered based on a thermodynamic database.The effect of electromagnetic stirring (EMS) was determined by increasing both the thermal conductivity and crystal formation rate in the liquid phase.The results show that the cooling curves and solidification structure calculated by this model agree well with the experimental results.The optimum pouring temperature range for tire cord steel casting was also discussed based on the present model.By comprehensive consideration of billet quality and smooth production,the pouring temperature should be controlled at about 1,495℃ under the casting conditions of the local plant in this study.
文摘采用CAFE模型(Cellular automata finite element method)模拟第二代镍基高温合金CMSX4凝固过程中的晶粒生长,并探讨浇注温度和冷却速度对凝固组织的影响。结果表明:凝固开始时,首先在铸锭底部会形成一层取向随机的细小等轴晶,由于晶粒间的竞争生长,晶粒数目减小,晶粒尺寸增大,?001?晶向与热流方向偏离角较大的晶粒逐渐被偏离角较小的晶粒淘汰。浇注温度的提高会使晶粒尺寸变大、晶粒数目变小,而冷却速度的升高却会使晶粒尺寸变小,与理论分析一致。
文摘We mainly studied effects of nucleation parameters((35)T_(v,max) and(35)T_(s,max)) and superheat on solidification structure of ZG12 MnMoV low-alloy steel by integration of CAFE and experimentation. The result shows that grain dimension is not only related with nucleation parameters, but also with superheat. The smaller(35)T_(v,max) and(35)T_(s,max) get, the tinier grain turns. The lab experimentation on optimum parameter is conducted, the mean diameter of grain in lab test specimen is 153.2 μm, and the mean diameter calculated by CAFE model is 151.1 μm. The calculated solidification structure agrees with the experimental result in the main.
