Periodic transverse depressions called “oscillation marks” are routinely observed on the surface of steel slabs manufactured by continuous casting processes. Additionally, a distinctive sub-surface microstructural feature called a “hook” 4, 5) often accompanies deep oscillation marks in steels with low (< 0.1%) carbon contents . Figure 1 shows typical shapes and sizes of oscillation marks and h...

The purpose of this investigation was to study the intra-oral rehardening of acid-softened enamel and fluoride uptake from SnF2 gel. Bovine enamel slabs were softened with 0.1 mol/L lactate buffer at pH 4.0 for 14 hrs and then mounted in a mandibular removable Hawley appliance. Control slabs were worn for 96 hrs by seven adult males whose teeth were brushed daily with a fluoride-free dentifrice...

Disturbance/discomfort caused by vibrations, induced pedestrian walking on slabs in residential/office buildings, is a typical design issue for lightweight slender slabs, including prestressed concrete ones. Precast are typically made with pretensioned members which allow only partial collaboration the transverse slab direction, becomes even less effective when they dry-assembled without cast-i...

On the basis of Brody–Flemings model and modified Voller–Beckermann model, an analytical micro-segregation is established by considering actual solidification cooling conditions bloom. According to developed interdendritic solute distribution at origin cracking gap obtained. It found that both phosphorus sulfur have quite severe segregation, but carbon manganese slight segregation; these result...

Abstract: A direct-chill (DC) cast process of an aluminum ingot of size 3200×1292×320 mm is analyzed numerically by the analysis of a fixed controlled system. The study investigates the DC processes in which liquid aluminum is cooling continuously in mold and then with water spray at the exit of mold. An inverse method is applied to measure heat transfer coefficient on water cooling surface exp...

This research examined the effects of micro-straight steel fiber percentage and column form on punching shear SFRC slabs. Fibers made micro with a diameter 0.2 mm length 13mm an aspect ratio equal to 65 were used. The content varied between 0.5%, 1%, 1.5% by volume. Four different types concrete mixes adopted tested. Experimental results showed that when fibers in increased, its compressive str...

Continuous casting is a critical step in the steel manufacturing process where molten metal is solidified in the form of slabs of rectangular cross-section. Minor variations in this step can impact the production process widely – from excellent product quality to breakdown in the production chain. In continuous casting the liquid steel from a ladle is first poured into a buffer vessel called a ...

The solidification behavior and structure of continuous casting high rail U71Mn bloom, under different secondary cooling conditions and superheat, were numerically investigated using the Cellular Automaton-Finite Element (CAFE) model implemented with ProCAST software. Nail shooting and macro etch experiments of the bloom samples under different cooling conditions were conducted to verify the mo...

−− An experimental study on solidification structure development and on endogenous inclusion precipitation in a continuously cast resulphurised steel is presented. Results were obtained by investigating two heats of a free cutting C-Mn steel cast in billets with a diameter of 145 mm. The as cast structure was evaluated by macroand microscopic analyses. Primary and secondary dendrite arm spacing...