New Method for Calculating Thermal Stress of Continuous Casting Slab Solidified Shell
The secondary cooling et al.process factors of casting process determine the temperature field of the slab.The existence of temperature gradient inside the slab is the root cause of producing thermal stress.However,the thermal stress is too large will lead to the crack initiation of slab solidifying front.Therefore,when optimizing the second cooling process,the corresponding change generated by the thermal stress of slab solidifying front changing with the temperature field need to be obtained timely.Given the low efficiency and being not conducive to on-line analysis of the commonly used numerical solution to solve the thermal stress,when establishing the model,this article made this hypothesis that the solidified shell is only make one-dimensional heat transfer in the thickness direction and use the compensation method deduce the thermal stress formula of the continuous casting slab solidified shell,proposing a new calculation method.The deduction formula is simple and its physical meaning is clear.Compared with numerical methods for solving thermal stress,this derived theoretical formula ensures the premise of the accuracy and greatly improve the thermal stress calculation speed.But the formula derived in this paper has some limitations,since the solidified shell was reduced to the flat when deriving the formula.Namely,there is no liquid phase in the solidifying front.Therefore,when selecting and determining the critical strain of the formation of the internal crack,the location which corresponds to solidus temperature should be regarded as the solidifying front.
continuous casting slab solidifying front finite element thermal stress
Dongfeng HE Sheng CHANG
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,100083,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
629-632
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）