Effect of Substrate Grain Size on the Growth, Texture and Internal Stresses of Iron Oxide Scales Forming at 450 °C

Juricic, C.; Pinto, Haroldo Cavalcanti; Cardinali, D.; Klaus, Manuela; Genzel, Ch.; Pyzalla, A.

doi:10.1007/s11085-009-9162-1

Cited by 32 publications

(45 citation statements)

References 59 publications

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“…Finally, compared to previous texture studies [26,33], the texture evolution of magnetite in Fig. 9 is similar to the findings of the oxides formed on an ultra-low-carbon steel that was reheated for 5 s at 1050 °C and subjected to a 70% reduction in height by plane strain compression [26].…”

Section: Formation Mechanism Of the Refined Magnetite Grainssupporting

confidence: 85%

“…This implies that the {001} fibre of magnetite in Fig. 10a is derived from the re-oxidation of the formed oxide at high temperature, which can also be found elsewhere [24,33]. Alternatively, the {110} fibre texture of magnetite in Fig.…”

Section: Formation Mechanism Of the Refined Magnetite Grainsmentioning

confidence: 84%

“…Alternatively, the {110} fibre texture of magnetite in Fig. 10b shares a similar source in the magnetite layer after 1 h of oxidation of the iron single crystal below 450°C [33]. The texture component indicates once again that the inner refined magnetite is also a result of the first nucleated magnetite grains (pro-eutectoid product) and not only a product of oxide scale detachment and inner re-oxidation [37].…”

Section: Formation Mechanism Of the Refined Magnetite Grainsmentioning

confidence: 89%

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Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel

Jiang

Zhao

et al. 2015

Surface and Coatings Technology

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Q. (2015). Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel. Surface and Coatings Technology, Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel AbstractBoth orientational and geometrical characteristics of grains in tertiary oxide scales have been quantitatively investigated using the electron backscatter diffraction (EBSD) technique. Phase and orientation mappings demonstrate that the {001} planes of magnetite and the {0001} planes of hematite are parallel to the direction of oxide growth. Pole figures (PFs) as scattering plots clearly display the direct correlation between the orientations and microstructure sites of magnetite grains. Magnetite grains develop a strong rotated cube texture component that shifts to the {100} component, whereas those with the grain size of 1-5. μm develop the {001} cube texture component. The refined magnetite grains surrounding the abnormal ones can be a combined process, including magnetite pro-eutectoid during hot rolling and cooling and re-oxidation during air-cooling. Our findings offer insights toward further understanding of the link between the geometrical and orientation parameters of grains with respect to the deformation behaviour of oxide scales formed at elevated temperatures.

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Section: Formation Mechanism Of the Refined Magnetite Grainssupporting

confidence: 85%

Section: Formation Mechanism Of the Refined Magnetite Grainsmentioning

confidence: 84%

Section: Formation Mechanism Of the Refined Magnetite Grainsmentioning

confidence: 89%

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Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel

Jiang

Zhao

et al. 2015

Surface and Coatings Technology

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“…The situation within the low-temperature oxidation regime of a-iron, i.e. at 450°C, is treated in [18].…”

Section: Aim Of the Workmentioning

confidence: 99%

“…The hotrolled pure iron polycrystal (Armco-iron) was supplied by REMAG AG, Mannheim, Germany. Its chemical composition is provided in [18]. The average grain size is 25 lm.…”

Section: Ex Situ Oxidation and Thermogravimetrymentioning

confidence: 99%

Evolution of Microstructure and Internal Stresses in Multi-Phase Oxide Scales Grown on (110) Surfaces of Iron Single Crystals at 650 °C

et al. 2009

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The evolution of microstructure and growth stresses in oxide scales grown on a (110) iron single crystal surface at 650°C was studied by electron backscatter diffraction and in situ energy-dispersive diffraction with synchrotron radiation. Within this high temperature regime, the oxidation kinetics and scale microstructure were not significantly different from those encountered in the oxidation of ferrous polycrystals. Thus, epitaxial strains did not determine the stress state within the oxide scale. Relevant sources of growth stresses were inferred to be volumetric differences between the iron oxides in the early stages, and later, inner oxide formation, scale consumption as well as pore formation. These sources caused time-dependent stress cycles in magnetite and wüstite during oxidation. In the hematite layer stress cycles did not occur and creep appeared to be the predominant stress relieving mechanism. On cooling, the differences in thermal expansion caused residual stress gradients through the oxide scale.

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Exploring structural similarities between crystal phases using EBSD pattern comparison

Nolze

Winkelmann

2014

Crystal Research and Technology

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We discuss the application of EBSD for the analysis of structural features of magnetite and hematite relevant in the topotactic growth of both phases. The orientation relationships of both phases are investigated using characteristically related sets of Kikuchi patterns, which were collected from topotactically intergrown hematite variants and their parent magnetite crystal grain. We address the hexagonal description of trigonal and cubic phases with respect to crystallographic relationships. The combination of locally resolved EBSD measurements and microstructural investigations thus offers a promising opportunity to evaluate orientation relationships and intergrowth between magnetite and hematite.

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Effect of Substrate Grain Size on the Growth, Texture and Internal Stresses of Iron Oxide Scales Forming at 450 °C

Cited by 32 publications

References 59 publications

Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel

Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel

Evolution of Microstructure and Internal Stresses in Multi-Phase Oxide Scales Grown on (110) Surfaces of Iron Single Crystals at 650 °C

Exploring structural similarities between crystal phases using EBSD pattern comparison

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