Abstract
The sensitivity of macroscopic mechanical and thermal properties of grey cast iron is computationally investigated for a variety of graphite morphologies over a wide temperature range. In order to represent common graphite morphologies according to EN ISO 945-1, a synthetic approach is used to algorithmically generate simulation domains. The developed mechanical and thermal model is applied in a large simulation study. The study includes statistical volume elements of the graphite morphology classes GJL-150 and IA2 to IA5, with 10, 11 and 12 v.−% of graphite precipitations, respectively, for a temperature range from 20 to 750 °C. Homogenised macroscopic quantities, such as the Young’s moduli, Poisson’s ratios, yield strengths and thermal conductivities, are predicted for different morphology classes by applying simulation and data analysis tools of the research data infrastructure Kadi4Mat. This is the first work to determine the mechanical and thermal properties of the morphology classes defined in EN ISO 945-1.
Highlights
Cast iron with lamellar graphite can be considered as a kind of natural composite material, consisting of a metallic matrix with embedded graphite particles [1,2,3,4]
The creation of a database that maps the relationship between graphite morphology and macroscopic mechanical and thermal properties of cast iron with lamellar graphite can be carried out via a large number of experiments, i.e., entirely without numerical methods
The generation of morphologies corresponding to the graphite classes IA2 to IA5 is realised in a synthetic manner, as the size distribution of the graphite lamellae, given for a graphite class of EN ISO 945-1, does not occur in real castings, because a mixture of the different graphite characteristics is always present in reality
Summary
Cast iron with lamellar graphite can be considered as a kind of natural composite material, consisting of a metallic matrix with embedded graphite particles [1,2,3,4]. In a large temperature range, this approach allows quantitative statements to be made about the influence of different spatial morphology of the graphite lamellae and different graphite volume fractions on macroscopic mechanical and thermal material properties. The creation of a database that maps the relationship between graphite morphology and macroscopic mechanical and thermal properties of cast iron with lamellar graphite can be carried out via a large number of experiments, i.e., entirely without numerical methods. Such an approach would require a non-destructive detection of the morphology, for example, before tensile tests are carried out, using the focused ion beam method [18] or microtomography [19].
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