Experimental assessment of interfacial contact thermal conductance between graphite and matrix in cast iron

J., Z.; Wen, Quan; Gao, Peihu; Yang, Zhong; Guo, Yongchun; Li, J. P.; Liang, Minxian

doi:10.1080/13640461.2017.1409450

Cited by 3 publications

(8 citation statements)

References 27 publications

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“…Microstructure of cast iron was observed by using a Nicon300 metallographic microscope and was traced by using Pro/E. en an IGES file was generated and imported into ANSYS to establish the FE models [16,17]. Cast iron material can be seen as a kind of composite material [14,18,19].…”

Section: Building Of Fe Modelsmentioning

confidence: 99%

“…According to Yang et al [16], ICTC can be seen as a thermal barrier resistance between diamond and aluminium matrix. Ma [17,19] pointed out that interfacial thermal conductance cannot be ignored in the analysis of heat conduction. As ascribed in the former section, CGI can be seen as a simple composite material.…”

Section: Interfacial Contactmentioning

confidence: 99%

“…erefore, above models are no longer inadequate. Recently, finite element (FE) simulation has been used for analyzing the thermal conductivity of cast iron [16,17]. It is a feasible technical method.…”

Section: Introductionmentioning

confidence: 99%

“…It is a feasible technical method. Ma [17] pointed out that thermal conductivity of CGI increases with vermicularity through FE simulation. e calculation values are close to reality when considering interfacial contact thermal conductance (ICTC).…”

Section: Introductionmentioning

confidence: 99%

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Computational Assessment of Thermal Conductivity of Compacted Graphite Cast Iron

Yang

et al. 2019

Advances in Materials Science and Engineering

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Two-dimensional FE models of CGI with different pearlite contents for thermal conductivity analysis were established according to the real metallographic images obtained by Pro/E and ANSYS. Meanwhile, thermal conductivity of CGI with different pearlite contents was tested through the laser flash method. It is indicated that the thermal conductivity of CGI declines with the increase of pearlite. When pearlite is increased from 10% to 80%, the experimental values decline from 46.63 W/m·K to 36.86 W/m·K, reducing by 21%. However, this declining tendency becomes gentle and slight when pearlite is more than 40%. In addition, the calculation results with the consideration of interfacial contact thermal conductance (ICTC) and pearlite are much close to experimental values; especially when pearlite is 80%, the difference between them is only about 2%. It can be concluded that the FE models are convenient and reasonable to analyze thermal conductivity of CGI.

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Section: Building Of Fe Modelsmentioning

confidence: 99%

Section: Interfacial Contactmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational Assessment of Thermal Conductivity of Compacted Graphite Cast Iron

Yang

et al. 2019

Advances in Materials Science and Engineering

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“…The numerical simulation method can realize the control of a single microstructure variable. Previous studies, combining with experiments and 2-D or 3-D finite element analysis, reported the effects of vermicularity [ 18 ], pearlite content [ 19 ], interfacial contact thermal conductivity (ICTC) [ 20 ] and spatial connectivity [ 21 , 22 ] on the thermal conductivity of VGI, respectively. Nevertheless, finite element modeling of vermicular graphite is difficult considering graphite anisotropy.…”

Section: Introductionmentioning

confidence: 99%

A New Theoretical Method for Studying Effects of Microstructure on Effective Thermal Conductivity of Vermicular Graphite Cast Iron

et al. 2023

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To provide the basis for thermal conductivity regulation of vermicular graphite cast iron (VGI), a new theoretical method consisting of shape interpolation, unit cell model and numerical calculation was proposed. Considering the influence of the graphite anisotropy and interfacial contact thermal conductivity (ICTC), the effective thermal conductivity of a series of unit cell models was calculated by numerical calculation based on finite difference. The effects of microstructure on effective thermal conductivity of VGI were studied by shape interpolation. The experimental results were in good agreement with the calculated ones. The effective thermal conductivity of VGI increases in power function with the decrease in graphite shape parameter, and increases linearly with the increase in graphite volume fraction and thermal conductivity of matrix. When the graphite volume fraction increases by 1%, the thermal conductivity of nodular cast iron increases by about 0.18 W/(m·K), while that of gray cast iron increases by about 3 W/(m·K). The thermal conductivity of cast iron has the same sensitivity to the thermal conductivity of matrix regardless of the graphite shape parameter. The thermal conductivity of matrix increased by 15 W/(m·K) and the thermal conductivity of cast iron increased by about 12 W/(m·K). Moreover, the more the graphite shape deviates from the sphere, the greater the enhancement effect of graphite anisotropy on thermal conductivity than the hindrance effect of interface between graphite and matrix. This work can provide guidance for the development of high thermal conductivity VGI and the study of thermal conductivity of composites containing anisotropic dispersed phase particles with complex shapes.

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3D morphology characterization of graphite and its effect on the thermal conductivity of vermicular graphite iron

Yang

Guo

et al. 2019

International Journal of Materials Research

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It is important to establish the quantitative effect of graphite's 3D morphology on the thermal conductivity of vermicular graphite iron. In the present study, X-ray tomography is utilized to investigate the 3D morphology of graphite in vermicular graphite iron with different vermicularity. A 3D finite element model was built on the basis of graphite's 3D morphology and the equivalent thermal conductivity of vermicular graphite iron can be calculated. The results show that the volume of graphite clusters in vermicular graphite iron is distributed according to y = a (1 − e−bx)c exponential function. The higher the vermicularity, the more obvious the polarization of graphite volume. Compared with vermicularity, 3D connectivity of graphite is a more appropriate characteristic parameter to investigate the thermal conductivity of vermicular graphite iron from the 3D morphology point of view.

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Experimental assessment of interfacial contact thermal conductance between graphite and matrix in cast iron

Cited by 3 publications

References 27 publications

Computational Assessment of Thermal Conductivity of Compacted Graphite Cast Iron

Computational Assessment of Thermal Conductivity of Compacted Graphite Cast Iron

A New Theoretical Method for Studying Effects of Microstructure on Effective Thermal Conductivity of Vermicular Graphite Cast Iron

3D morphology characterization of graphite and its effect on the thermal conductivity of vermicular graphite iron

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