Quantitative and Qualitative Aspects of Gas–Metal–Oxide Mass Transfer in High-Temperature Confocal Scanning Laser Microscopy

During high-temperature confocal scanning laser microscopy (HT-CSLM) of liquid steel samples, thermal Marangoni flow and rapid mass transfer between the sample and its surroundings occur due to the relatively small sample size (diameter around 5 mm) and large temperature gradients. The resulting eva...

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Bibliographic Details
Published in:JOM (1989) 2018-07, Vol.70 (7), p.1193-1198
Main Authors: Piva, Stephano P. T., Pistorius, P. Chris, Webler, Bryan A.
Format: Article
Language:English
Subjects:
Advanced Real Time Optical Imaging
Automation
Boundary conditions
Calcium
Chemical composition
Chemical reactions
Chemistry/Food Science
Computer simulation
Earth Sciences
Engineering
Environment
Equilibrium
Experiments
Heat
High temperature
Interfaces
Killed steels
Laser microscopy
Lasers
Magnesium
Manganese
Mass transfer
Metals
Microscopy
Nonmetallic inclusions
Organic chemistry
Oxidation
Physics
Sample size
Silicon steels
Slag
Steel
Temperature gradients
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Summary:During high-temperature confocal scanning laser microscopy (HT-CSLM) of liquid steel samples, thermal Marangoni flow and rapid mass transfer between the sample and its surroundings occur due to the relatively small sample size (diameter around 5 mm) and large temperature gradients. The resulting evaporation and steel–slag reactions tend to change the chemical composition in the metal. Such mass transfer effects can change observed nonmetallic inclusions. This work quantifies oxide–metal–gas mass transfer of solutes during HT-CSLM experiments using computational simulations and experimental data for (1) dissolution of MgO inclusions in the presence and absence of slag and (2) Ca, Mg–silicate inclusion changes upon exposure of a Si–Mn-killed steel to an oxidizing gas atmosphere.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-018-2875-3