Simulation of evolution behavior of alumina inclusions in thick plates of high-strength marine steel
In order to investigate the influence laws of rolling process on the crushing condition in inclusions of high-strength marine steel,the thick plates containing inclusions were analyzed by finite element,and physical simulation of inclusion evolution was conducted through thermal compression deformation experiments.The results show that the crushing of Al2O3 inclusions is gradually transmitted from the surface in contact with the matrix to the center,and the fractures occur in the middle position.The larger the inclusion size is,the easier it is to crush.When the size reaches to a certain value,the influence of the size on the crushing behavior of the inclusion dimini-shes progressively.Compared with isothermal rolling under the same reduction rate,differential temperature rolling leads to more uniform deformation in the thickness direction,it is easier to achieve the crushing condition of inclusions at the center position.The thermal de-formation results show that the inclusions with larger size(Φ80-Φ100 µm)are seriously crushed,while the inclusion with smaller size(≤Φ5 pm)is not obviously crushed,which is consistent with the finite element simulation result.
differential temperature rollingAl2O3 inclusionfinite elementsub-model technologycohesive zone model
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