1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:Crack initiation and growth are usually caused by non-metallic inclusions (NMI) during the rolling process, and it is necessary to study the effects of NMIs on the mechanical properties of low-density steel. The influences of typical NMIs such as single Al2O3, MnS, AlN, TiN and Al2O3-AlN、AlN-MnS complex NMIs on the stress field in low-density steel were investigated using Abaqus software, and then the effects of type, size, direction, distribution of NMIs on stress field were also studied. The results show that the deformability, shape, and size of NMIs significantly affect the distribution of stress field, and the maximum stress value caused by NMIs and nearby matrix are TiN, AlN, Al2O3, and MnS in descending order. The maximum stress value and range of stress field are positively associated with the size of NMI. Moreover, the angle between the longitudinal axis of NMI and loading direction affects the crack initiation location and propagation direction. As for TiN and AlN inclusions, the sharp corner located in the loading direction can inhibit the stress concentration. In addition, the aggregated NMIs are more likely to cause the stress concentration, and the maximum stress value has a negative correlation in the distance of NMIs. For Al2O3-AlN complex inclusion, the internal Al2O3 could prevent deformation of complex inclusion and increase the stress value, and increase the harmfulness of AlN. However, for AlN-MnS complex inclusion, the stress concentration in corner of AlN could be relieved by externally wrapping with MnS inclusion, and the harmfulness of AlN could be decreased. Therefore, to decrease the harmfulness of NMIs on properties of low-density steel, the number and size of brittle NMIs and aggregated AlN should be controlled, and the damage of AlN inclusion to be reduced by AlN-MnS complex inclusion.
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