Abstract
AbstractIt 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.
Highlights
The unique mechanical and physical properties of vermicular graphite iron (VGI) have gained the material desirability and increasing demand in both automotive and locomotive industries, for example the cylinder heads of diesel engines
The increase of engine specific power brings about the working temperature rise of the cylinder head, and the mechanical properties of VGI are subject to higher requirements
With the decreasing of the latent capacity of mechanical properties, physical properties of cast iron, especially the thermal conductivity, have received more and more attention since the ability to transfer away heat enhances the resistance to such factors as thermal fatigue and distortion [6 – 10]
Summary
The unique mechanical and physical properties of vermicular graphite iron (VGI) have gained the material desirability and increasing demand in both automotive and locomotive industries, for example the cylinder heads of diesel engines. For high power density diesel engines, whether from the viewpoint of the volume size, corrosion resistance and. The increase of engine specific power brings about the working temperature rise of the cylinder head, and the mechanical properties of VGI are subject to higher requirements. With the decreasing of the latent capacity of mechanical properties, physical properties of cast iron, especially the thermal conductivity, have received more and more attention since the ability to transfer away heat enhances the resistance to such factors as thermal fatigue and distortion [6 – 10]
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