Microstructure Observations of Graphite in Gray Cast Iron Using TEM

Makoto Takezawa; Seung Won Lee; Susumu Ikeno; Kenji Matsuda

doi:10.4028/www.scientific.net/MSF.879.1911

Paper Titles

Effect of the Interfacial Thermal Resistance on Effective Thermal Conductivity of Al/SiC Particle-Dispersed Composites
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Influence of β-Mg₁₇Al₁₂ Phase on Initial Pitting Process of AZ91D Magnesium Alloy
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The Low-Nickel Cryogenic Steel Alloyed by Nitrogen
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Three-Dimensional Dynamic Explicit Finite Element Analysis of Charpy Impact Test
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Microstructure Observations of Graphite in Gray Cast Iron Using TEM
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Dispersion of CNTs in Selective Laser Melting Printed AlSi10Mg Composites via Friction Stir Processing
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Design and Characterization of Conductive Biopolymer Nanocomposite Electrodes for Medical Applications
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Thermal Joining of Highly Conductive Bonds by Using Reactive Al-Ni Nanofoils
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Relationship between Microstructure and Mechanical Properties in Q&P-Steels
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HomeMaterials Science ForumMaterials Science Forum Vol. 879Microstructure Observations of Graphite in Gray...

Microstructure Observations of Graphite in Gray Cast Iron Using TEM

Abstract:

Cast iron is an iron alloy mainly composed of carbon and silicon, the amount of carbon is more than 2.1 mass%. Cast irons, gray cast iron and ductile cast iron, have been used as industrial parts and automobile parts widely because they have a good wear resistance and an excellent machinability. Graphite formation mechanism have been proposed, but, it is not established clearly yet. In this study, the microstructure of flake graphite was investigated to reveal the graphite formation mechanisms using FC250 alloy. Transmission electron microscopy (TEM) samples were prepared using focused ion beam (FIB). In the case of a cross section of flake graphite taken perpendicular to its elongated direction using TEM, internal microstructure of flake graphite was observed layered structure. In the case of a cross section of flake graphite taken parallel to its elongated direction, clear microstructure was not observed. Selected area electron diffraction (SAED) from flake graphite showed <0001> direction of graphite are mostly parallel to their thickness.