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  Inhomogeneity of Microstructure and Damping Capacity of a FC25 Disc-Brake Rotor and Their Interrelationship

Park, J., Han, J., Lee, S.-J., Yi, K., Kwon, C., & Lee, Y.-K. (2016). Inhomogeneity of Microstructure and Damping Capacity of a FC25 Disc-Brake Rotor and Their Interrelationship. Metallurgical and Materials Transactions A, 47(8), 3933-3942. doi:10.1007/s11661-016-3580-x.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B6B1-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B6B2-8
Genre: Journal Article

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 Creators:
Park, Jongbin1, Author              
Han, Jeongho1, 2, Author              
Lee, Seung-Joon1, Author              
Yi, Kyoungdon3, Author              
Kwon, Chelwoong3, Author              
Lee, Young-Kook4, Author              
Affiliations:
1Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea, persistent22              
2Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
3Chassis Design 2 Team, Seohan Industry, Hwaseong, Gyeonggi-do, South Korea, persistent22              
4Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Republic of Korea, persistent22              

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Free keywords: Brakes; Cast iron; Cooling; Graphite; Microstructure; Volume fraction, Cooling rates; Damping capacity; Graphite particles; Gray cast iron; Inhomogeneities; Inhomogeneous microstructure; Interphase boundaries; Vibrational modes, Damping
 Abstract: The objective of the present study was to investigate the inhomogeneity of microstructure and damping capacity of a FC25 disc-brake rotor made of gray cast iron (GCI) and their interrelationship. The rotor had inhomogeneous microstructure due to different cooling rates caused by the position of inlets in a mold during casting. The volume fraction and size of graphite decreased with increasing cooling rate. A maximum deviation of the volume fraction of graphite within the rotor was approximately 2 pct, whereas that of the total perimeter of graphite per unit area was approximately 33 pct. Damping capacities measured at the first vibrational mode of both the real rotor and cantilever specimens, which were taken from four different regions within the rotor, depended on the location within the rotor. This result indicates that the damping capacity of the rotor is influenced by the inhomogeneous microstructure; particularly, the damping capacity was proportional to the total perimeter of graphite per unit area. Therefore, it was concluded that the damping of the GCI rotor used in the present study occurs primarily by the viscous or plastic flow at the interphase boundaries between the pearlite matrix and graphite particles at least at the frequencies of below 1140 Hz. © 2016, The Minerals, Metals Materials Society and ASM International.

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Language(s): eng - English
 Dates: 2016-08-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s11661-016-3580-x
BibTex Citekey: Park20163933
 Degree: -

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Title: Metallurgical and Materials Transactions A
  Other : Metallurgical and Materials Transactions A, Physical Metallurgy and Materials Science
  Abbreviation : Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
Source Genre: Journal
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Publ. Info: New York, NY : Springer Sciences & Business Media
Pages: - Volume / Issue: 47 (8) Sequence Number: - Start / End Page: 3933 - 3942 Identifier: ISSN: 1073-5623
CoNE: /journals/resource/954928569608