Identification of Surface Selective Oxides on Continuous Annealed Steels

Surface selective oxide layer on continuous annealed steels is difficult to analyze because of its thickness in nanometer scale, but it tremendously affects the properties of the coatings. Detailed photographs about the morphology, distribution and relative surface coverage of different oxides are s...

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Bibliographic Details
Published in:JOM (1989) 2024-06, Vol.76 (6), p.3231-3242
Main Authors: Cai, Ning, Hao, Yulin, Li, Xuetao, Yao, Shicong, Long, Yuan, Cao, Jianping
Format: Article
Language:English
Subjects:
Carbon
Chemical composition
Chemistry/Food Science
Continuous annealing
Corrosion potential
Crystal structure
Dual phase steels
Earth Sciences
Electron diffraction
Emission standards
Energy consumption
Engineering
Environment
Fourier transforms
Grain boundaries
High strength steels
Interstitial free steels
Morphology
Oxidation
Oxides
Physics
Scanning electron microscopy
Single crystals
Steel
Technical Article
Thickness
Tin
Transmission electron microscopy
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Summary:Surface selective oxide layer on continuous annealed steels is difficult to analyze because of its thickness in nanometer scale, but it tremendously affects the properties of the coatings. Detailed photographs about the morphology, distribution and relative surface coverage of different oxides are still limited in relevant literature. With the method of carbon extraction replicas, such oxides are extracted from dual-phase high strength steels and Ti-stabilized interstitial free steel, and they are analyzed by transmission electron microscope (TEM) with energy-dispersive spectroscopy (EDS) and selected area electron diffraction (SAD) attachments. Their chemical composition, crystal structure, size, morphology and distribution are investigated in detail. Four different ternary oxides including Mn 2 SiO 4 , MnCr 2 O 4 , MnAl 2 O 4 and Mn 2 TiO 4 are extracted and confirmed in both crystal structure and chemical compositions. MnAl 2 O 4 and Mn 2 TiO 4 on steel surface are identified by single-crystal SAD and EDS techniques. MnCr 2 O 4 is confirmed to have similar chemical compositions and crystal structure with reported literature but different particle size and location observed. Mn 2 SiO 4 along the grain boundaries is also photographed in low Si content of 0.2–0.7 wt% steels, which is usually reported in high Si-containing steels and low Mn/Si ratio. Among all these oxides, Mn 2 SiO 4 is bigger than the others.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-024-06455-z