Deformation behavior of typical inclusions in GCr15 during hot rolling process
J. Min. Metall. Sect. B-Metall., 60 (3) (2024) 381-394. DOI:10.2298/JMMB240905031J
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Available online 13 decembar 2024
(Received 05 September 2024; Accepted 10 December 2024)
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Non-metallic inclusions have a considerable influence on the lifespan of bearing steel. Studying the deformation behavior of these inclusions during the rolling process is crucial for controlling their shape and size in production. This study focuses on GCr15 bearing steel, a representative grade of bearing steel, and utilizes ABAQUS finite element software to simulate the deformation of Al2O3 inclusions, MnS inclusions, and Al2O3-MnS composite inclusions after hot rolling of GCr15 steel. The findings indicate that when the size of the inclusions is within 10 µm, their type and shape have a greater influence than variations in size. Among them, Al2O3-MnS composite inclusions damage the steel matrix the least. The stress concentration of Al2O3 inclusions will occur on the MnS cladding layer, which can slow down the occurrence of cracks. In additionally, the aspect ratio of MnS inclusions decreases after rolling, which reduces their influence on the anisotropy of the steel matrix. At the same time, composite inclusions can harmonize the deformation capabilities of the inclusions and the steel matrix, minimizing the likelihood of void formation. Consequently, in the smelting process, it is beneficial to modify inclusions into regular circular shapes and form composite Al2O3-MnS inclusions to mitigate their detrimental effects on the steel matrix.
Keywords: Hot rolling; Complex inclusions; Stress concentration; Strain difference; Finite element simulation
Correspondence Address:
J.-L. Li,
Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, China; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, China;
email: jli@wust.edu.cn
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