Mitigation of Black Streak Defects in AISI 304 Stainless Steel via Numerical Simulation and Reverse Optimization Algorithm
Xuexia Song, Xiaocan Zhong, Wanlin Wang, Kun Dou
TL;DR
This paper investigates how to reduce black streak defects in stainless steel by optimizing casting parameters and slag properties using simulations and optimization.
Contribution
A novel reverse optimization algorithm is used to determine optimal mold slag properties for defect mitigation in stainless steel production.
Findings
Black streak defects are caused by slag entrapment during continuous casting.
Increasing casting speed intensifies meniscus turbulence, worsening defects.
Optimized slag properties significantly reduce surface velocity and improve interface temperature.
Abstract
The formation mechanism of black streak defects in hot-rolled steel sheets was investigated to address the influence of the process parameters on the surface quality during the production of 304 stainless steels. Macro-/microstructural characterization revealed that the defect regions contained necessary mold slag components (Ca, Si, Al, Mg, Na, K) which originated from the initial stage of solidification in the mold region of the continuous casting process, indicating obvious slag entrapment during continuous casting. On this basis, a three-dimensional coupled finite-element model for the molten steel flow–thermal characteristics was established to evaluate the effects of typical casting parameters using the determination of the critical slag entrapment velocity as the criterion. Numerical simulations demonstrated that the maximum surface velocity improved from 0.29 m/s to 0.37 m/s…
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Taxonomy
TopicsMetallurgical Processes and Thermodynamics · Aluminum Alloy Microstructure Properties · Welding Techniques and Residual Stresses