Effect of graphite morphology on the tensile strength and thermal conductivity of cast iron

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.07.001· OSTI ID:22805779

Liu, Yangzhen ^[1]; Li, Yefei; Xing, Jiandong ^[2]; Wang, Shaogang ^[3]; Zheng, Baochao ^[1]; Tao, Dong; Li, Wei ^[1]

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1. Institute of Advance Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou, Guangdong 510632 (China)
2. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)
3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS, Shenyang 110016 (China)

Highlights: • The graphite morphology is characterized from 3D structure using X–ray tomography. • The size, distribution, shape and interconnectivity of graphite are estimated. • The influences of graphite morphology on tensile properties and thermal conductivity are evaluated. • The mechanism of tensile strength and the model of thermal conductivity are discussed. - Abstract: Graphite morphology is a very important parameter affecting the properties of cast iron. In this study, the graphite morphology was characterized using both 3D and 2D structures. The experimental results revealed that when the graphite was less spheroidal, the graphite had greater interconnectivity in the 3D structure of the cast iron. The size, distribution, volume fraction, and shape of the graphite were estimated. Moreover, the influences of the graphite's morphology, size, and distribution on the tensile property and thermal conductivity at different temperatures were estimated. The experimental results revealed that with an increase in temperature, the thermal conductivity initially increased, and then decreased, whereas the tensile strength decreased slightly at first, and then decreased rapidly. In addition, with an increase in the percentage of compacted graphite, the tensile strength decreased and the thermal conductivity increased. The fracture surfaces of tensile specimens were also estimated. Finally, the mechanism of tensile strength and the model of thermal conductivity were investigated.

• OSTI ID: 22805779
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 144; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CAST IRON
FRACTURES
GRAPHITE
SURFACES
TENSILE PROPERTIES
THERMAL CONDUCTIVITY
TOMOGRAPHY
X RADIATION