Numerical Simulation of the 65Mn-Cr Steel Slab Solidification Process and Analysis of the Formation Mechanism of Internal Cracks
Li Zhang, Lijun Xu, Guifang Zhang, Haibo Zhang, Qi Jiang, Shubiao Yin
TL;DR
This study uses simulation and experiments to understand and reduce internal cracks in 65Mn-Cr steel slabs during solidification.
Contribution
A new approach combining numerical simulation and experiments to analyze and mitigate internal cracks in 65Mn-Cr steel slabs.
Findings
The solidification speed of 65Mn-Cr steel varies at different positions from the meniscus.
Maximum plastic strain exceeds the critical value of 0.004, leading to internal cracks.
Adjusting spray water distribution in the secondary cooling section can reduce internal cracks.
Abstract
There are still internal defects such as triangular zone cracks, centerline cracks, and intermediate cracks in 65Mn-Cr steel during the production process, which mostly occur in the initial solidification. In order to explore the evolution of intermediate cracks during the initial solidification process of 230 mm × 1255 mm slab 65Mn-Cr steel, this study was based on a combination of numerical simulation and experiment, using COMSOL numerical simulation software to establish a flow and heat transfer coupling model and stress model, and carried out simulation research. The results show that the solidification speed of slab 65Mn-Cr steel is different at different positions from the meniscus. At the position where the reheating occurs, the heat transfer speed from the solidification front to the surface of the slab slows down, but the solidification speed varies in different areas of the…
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Taxonomy
TopicsMetallurgical Processes and Thermodynamics · Metallurgy and Material Forming · Aluminum Alloy Microstructure Properties