Abstract
The study of the micromechanical performance of materials is important in explaining their macrostructural behavior, such as fracture and fatigue. This paper is aimed, among other things, at reducing the deficiency of microstructural models of grey cast irons in the literature. For this purpose, a numerical modeling approach based on the crystal plasticity (CP) theory is used. Both synthetic models and models based on scanning electron microscope (SEM) electron backscatter diffraction (EBSD) imaging finite element are utilized. For the metal phase, a CP model for body-centered cubic (BCC) crystals is adopted. A cleavage damage model is introduced as a strain-like variable; it accounts for crack closure in a smeared manner as the load reverses, which is especially important for fatigue modeling. A temperature dependence is included in some material parameters. The graphite phase is modeled using the CP model for hexagonal close-packed (HCP) crystal and has a significant difference in tensile and compressive behavior, which determines a similar macro-level behavior for cast iron. The numerical simulation results are compared with experimental tensile and compression tests at different temperatures, as well as with fatigue experiments. The comparison revealed a good performance of the modeling approach.
Highlights
Cast iron has been one of the most widespread materials used by humankind for industrial applications
The micromechanical modeling of grey cast irons was taken further by means of crystal plasticity (CP) modeling: the material was simulated in tension and compression, as well as in fatigue
The specifics of the mechanical behavior of grey cast iron are taken into account at the microstructural level
Summary
Cast iron has been one of the most widespread materials used by humankind for industrial applications. In turn, is the most commonly used metal material in foundries [1]. The popularity of grey irons is determined by their outstanding physical properties, which provide a good machinability combined with low manufacturing and processing costs. Grey cast irons possess numerous disadvantages, one of which being the low ductility of the material. On the one hand, is a natural lubricant that provides a high wear resistance. On the other hand, being much less rigid than metal, it can cause local stress concentrations in the metal matrix. In this context, a proper study of the damage initiation and propagation (including fatigue) should be conducted at the microstructural level
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