The Role of Grain Boundary Diffusion in Initial Selective Oxidation Kinetics of a Manganese-Aluminum TRIP Steel

Thorning, Casper; Sridhar, Seetharaman

doi:10.1361/154770305x66691

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The CSLM furnace allowed for in-situ observation of high temperature processes such as melting, solidification, solid state phase transformations, and oxidation. 28,32) Infrared heating via a halogen lamp allowed for rapid heating and cooling. Confocal optics combined with a red He-Ne laser (wavelength 632.8 nm) enabled sample viewing at high temperatures.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…7,13,27) Grain size has also been shown to impact oxidation behavior, influencing overall coverage as well as surface oxide chemistry and morphology. 28) Coarse-grained samples from the study by Thorning et al tended to form a continuous network of manganese-rich oxides along the grain boundary, but sparse oxidation on grain interiors. Oxidation of the finegrained samples was more uniform across the entire surface.…”

Section: Introductionmentioning

confidence: 98%

“…Fine-grained samples also formed some oxides along grain boundaries, but not to the same extent as the coarse-grained samples. 28) The stable phase of iron is determined not only by annealing temperature, but by decarburization that can occur during annealing. Figure 1 below is an Fe-C pseudobinary phase diagram generated using ThermoCalc (version 2015b, TCFE8 database) illustrating that decarburization can lead to the formation of ferrite during annealing in the singlephase austenite field.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Microstructure on Oxidation of a CMnSi Advanced High Strength Steel

Story¹,

Webler²

2017

ISIJ Int.

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The work presented here demonstrated that changes to the near-surface microstructure could promote internal oxidation in a CMnSi advanced high strength steel (AHSS) grade. The starting material was industrially-supplied cold-rolled sheet. Samples with this microstructure were compared against two other conditions: annealed at 1 200°C and 850°C prior to oxidation. The surface regions of both annealed samples were decarburized. All samples were then oxidized at 850°C in an argon atmosphere with approximately 10 − 20 atm oxygen for 5-90 minutes. The oxidation treatments were performed in a high-temperature confocal scanning laser microscope (CSLM) setup that enabled in-situ visualization of surface oxide formation. Analysis of CSLM and scanning electron microscopy (SEM) images of sample surfaces indicated there were differences in oxide morphology and coverage between samples with different starting microstructures. Cold-rolled samples showed little internal oxidation but extensive external oxidation. Samples annealed prior to oxidation exhibited both internal and external oxidation. The differences in behavior were attributed to the formation of a decarburized surface layer during the pre-anneal, which led to ferritic iron near the surface. Another result of the pre-anneal was a reduction in dislocation density, which potentially led to fewer preferential nucleation sites for oxides very close to the sample surface.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Microstructure on Oxidation of a CMnSi Advanced High Strength Steel

Story¹,

Webler²

2017

ISIJ Int.

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“…The presence of Al 2 O 3 did not have a detrimental effect on wetting. Al was shown to have a smaller tendency towards surface segregation than Mn and Si, showing a tendency towards internal oxidation [11,31,32] and did not influence the wetting behaviour.…”

Section: Discussionmentioning

confidence: 96%