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Article

The Influence of Insertion Depth of Inorganic Materials on Solidification Microstructure and Segregation of 2.5-ton 42CrMo Ingot

State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
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Authors to whom correspondence should be addressed.
Submission received: 4 June 2024 / Revised: 17 June 2024 / Accepted: 17 June 2024 / Published: 25 June 2024

Abstract

In this work, a novel internal heat absorption technology using inorganic material rods is employed during the solidification process of steel ingots, aiming to control their solidification and improve the quality of the final product. The study investigates the effect of the insertion depth of inorganic materials on the solidification microstructure and macrosegregation of 2.5-ton 42CrMo ingots. The mechanical properties of samples from the product are also tested. A numerical simulation model for casting 2.5-ton ingots is established and implemented in Ansys Fluent fluid simulation software, with inorganic material rods set at different preset depths. The simulation explores the physical processes of the melting and floating of inorganic materials in molten steel, as well as their effects on the temperature and flow fields of the material. The results show that deeper insertion of inorganic materials (200 mm from the hot top) reduces the tendency for macrosegregation compared to that at the insertion depth of 100 mm. Specifically, the positive segregation area decreases by 10.35%, while the negative segregation area decreases by 15.32%. Moreover, deeper insertion results in a significant refinement of the solidification microstructure, ultimately enhancing the mechanical properties of the products machined from the ingots (i.e., the yield strength increased by 4.7%). The numerical simulation results indicate that as the placement depth of inorganic materials in the ingot mold increases, the cooling effect becomes more significant, the flow area of molten steel initiated by the inorganic materials expands, and the linear velocity of the double-circle flow increases. This further explains why the solidification quality of the ingots improves with the increasing placement depth of inorganic materials.
Keywords: inorganic materials; solidification microstructure; segregation; ingot inorganic materials; solidification microstructure; segregation; ingot

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MDPI and ACS Style

Sun, S.; Du, Y.; Zhang, Z.; Jiang, D.; Xu, S.; Ren, Z. The Influence of Insertion Depth of Inorganic Materials on Solidification Microstructure and Segregation of 2.5-ton 42CrMo Ingot. Metals 2024, 14, 753. https://0-doi-org.brum.beds.ac.uk/10.3390/met14070753

AMA Style

Sun S, Du Y, Zhang Z, Jiang D, Xu S, Ren Z. The Influence of Insertion Depth of Inorganic Materials on Solidification Microstructure and Segregation of 2.5-ton 42CrMo Ingot. Metals. 2024; 14(7):753. https://0-doi-org.brum.beds.ac.uk/10.3390/met14070753

Chicago/Turabian Style

Sun, Shujian, Yonglong Du, Zhenqiang Zhang, Danqing Jiang, Songzhe Xu, and Zhongming Ren. 2024. "The Influence of Insertion Depth of Inorganic Materials on Solidification Microstructure and Segregation of 2.5-ton 42CrMo Ingot" Metals 14, no. 7: 753. https://0-doi-org.brum.beds.ac.uk/10.3390/met14070753

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