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Meeting Materials Science & Technology 2019
Symposium Thermomechanical Processing in Shaping and Forming of Steels
Presentation Title Characterizing Longitudinal Defects in Steel Continuous Casting
Author(s) Matthew L.S. Zappulla, Brian G Thomas
On-Site Speaker (Planned) Matthew L.S. Zappulla
Abstract Scope Serious defects in steel continuous casting, including cracks and depressions, are often related to thermal-mechanical behavior during solidification in the mold. Defect samples have been collected, categorized, and analyzed; and a finite-element model has been developed to simulate the temperature, shape, and stress of the steel shell, as it travels through the mold to explore formation mechanisms and behavior of these defects. The model simulates transient heat transfer in the solidifying steel, between the shell and mold, and is coupled with a stress model that features temperature-, composition-, and phase-dependent elastic-visco-plastic constitutive behavior of the steel, accounting for liquid, delta-ferrite, and gamma-austenite phases. Depressions form when the shell is subjected to either excessive compression or tension, but appearances vary, and the shape of the depression changes when cracks are present. These defects are not mutually exclusive, and samples indicate that sub-surface cracks may be present without obvious surface indications.


Characterizing Longitudinal Defects in Steel Continuous Casting
Deformation Behavior of Non-metallic Inclusions during the Hot Torsion Process of Carbon Steel
Effect of Thermomechanical Strategy and Mo-Nb-B Alloying Additions on High Strength Medium Carbon Q/Q&T Steels
Effect of Vanadium and Aluminum Grain Refining Treatment on Steel Machinability
Effects of Thermomechanical Processing, Microalloying, and Rapid Heat Treatment on Microstructural Development, Carbonitride Precipitation, and Mechanical Behavior of Medium Carbon Steels
Evolution of Inclusions in Solid Steel during Reheating Process
Ferrite and Bainite Transformation from Austenite Grain Boundary in 0.6 wt.% C Steel
Formation of Polygonized Structures and Nuclear Recrystallization under Controlled Rolling of Low-carbon Steels
Some Aspects of Industrial Thermomechanical Processing of Steels
Yield Strength Improvement in 3rd Generation AHSS Through Warm Rolling

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