The method based on transient heat transfer model is adopted to simulate electro-slag remelting process. The calculated results of the model show that the process is in the quasi-steady state, and the shape of pool re...The method based on transient heat transfer model is adopted to simulate electro-slag remelting process. The calculated results of the model show that the process is in the quasi-steady state, and the shape of pool remains unchanged when the height of ingot is approximately 2.5-3 times the thickness of slab ingot. The change in the shape of pool is found to be strongly dependent on the pattern of melting rate, and hence, the power input; the depth of the molten pool increases with the increase in melting speed. It is concluded that a transient heat transfer model has to be used to obtain reliable input information for the entire, operatina time.展开更多
The slag pool is a complex system which gathers electromagnetic field,thermal field and flow field in the process of electroslag remelting(ESR)for production of large slab ingots.In this manuscript,mathematic foundati...The slag pool is a complex system which gathers electromagnetic field,thermal field and flow field in the process of electroslag remelting(ESR)for production of large slab ingots.In this manuscript,mathematic foundation and boundary conditions of the numerical simulation for thermal field in the ESR process of large slab ingots were analyzed, and mathematic model of heat generation in the slag pool and the solidification in the metal molten pool were founded by using the finite element software ANSYS.According to the simulation results,it can be found that the temperature distribution in the process of ESR for production of large slab ingots with double electrode series is different from that in the electroslag furnace with a single electrode.The region of the biggest current density and the highest temperature in the electroslag furnace with a single electrode is below the electrode,while the same region in the process of ESR with the double electrode series for production of large slab ingots locates between the two electrodes.The depth of the metal pool and the temperature of the slag bath simulated by mathematical model were close to the measured value in the experimental process,which verifies the reliability of the simulation method and the model,and it will provide a theoretical basis for the quality control of large slab ingots in the process of ESR.展开更多
12Cr2Mo1VR钢板生产的流程为100 t EAF-LF-VOD-CC-ESR-轧制工艺。电渣重熔过程中,采用熔速降低(160~180)kg/h及氮气保护等工艺;轧制过程采用低速大压下量轧制工艺;轧后采用650~700℃长时保温扩氢退火工艺;热处理采用930-950℃正火(加速...12Cr2Mo1VR钢板生产的流程为100 t EAF-LF-VOD-CC-ESR-轧制工艺。电渣重熔过程中,采用熔速降低(160~180)kg/h及氮气保护等工艺;轧制过程采用低速大压下量轧制工艺;轧后采用650~700℃长时保温扩氢退火工艺;热处理采用930-950℃正火(加速冷却)+680-700℃回火工艺。生产的钢板表面质量良好,探伤级别满足NB/T47013.3-2015及第1号修改单TⅠ级要求,钢板成分、显微组织均匀,力学性能满足技术要求。展开更多
文摘The method based on transient heat transfer model is adopted to simulate electro-slag remelting process. The calculated results of the model show that the process is in the quasi-steady state, and the shape of pool remains unchanged when the height of ingot is approximately 2.5-3 times the thickness of slab ingot. The change in the shape of pool is found to be strongly dependent on the pattern of melting rate, and hence, the power input; the depth of the molten pool increases with the increase in melting speed. It is concluded that a transient heat transfer model has to be used to obtain reliable input information for the entire, operatina time.
基金Item Sponsored by Central University of basic scientific research expenses in the National Natural Science Foundation of China Youth Project (51104038) Basic scientific research expenses of young teachers'scientific research project (N100302006)
文摘The slag pool is a complex system which gathers electromagnetic field,thermal field and flow field in the process of electroslag remelting(ESR)for production of large slab ingots.In this manuscript,mathematic foundation and boundary conditions of the numerical simulation for thermal field in the ESR process of large slab ingots were analyzed, and mathematic model of heat generation in the slag pool and the solidification in the metal molten pool were founded by using the finite element software ANSYS.According to the simulation results,it can be found that the temperature distribution in the process of ESR for production of large slab ingots with double electrode series is different from that in the electroslag furnace with a single electrode.The region of the biggest current density and the highest temperature in the electroslag furnace with a single electrode is below the electrode,while the same region in the process of ESR with the double electrode series for production of large slab ingots locates between the two electrodes.The depth of the metal pool and the temperature of the slag bath simulated by mathematical model were close to the measured value in the experimental process,which verifies the reliability of the simulation method and the model,and it will provide a theoretical basis for the quality control of large slab ingots in the process of ESR.
文摘12Cr2Mo1VR钢板生产的流程为100 t EAF-LF-VOD-CC-ESR-轧制工艺。电渣重熔过程中,采用熔速降低(160~180)kg/h及氮气保护等工艺;轧制过程采用低速大压下量轧制工艺;轧后采用650~700℃长时保温扩氢退火工艺;热处理采用930-950℃正火(加速冷却)+680-700℃回火工艺。生产的钢板表面质量良好,探伤级别满足NB/T47013.3-2015及第1号修改单TⅠ级要求,钢板成分、显微组织均匀,力学性能满足技术要求。
