Uncovering the local inelastic interactions during manufacture of ductile cast iron: How the substructure of the graphite particles can induce residual stress concentrations in the matrix

Abstract

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Residual Stresses around Individual Graphite Nodules in Ductile Iron: Impact on the Tensile Mechanical Properties

“…As can be seen in Fig. 1 (c), taken from [7], the maximum magnitude of the local residual stresses, associated with the elastic strain measured via X-ray diffraction, is likely in the order of the macroscopic proof stress of DI. This suggests that these stresses might have a significant influence on the mechanical properties of the material.…”

“…Note that the strain refers to the Fdirection, which is perpendicular to the diffraction planes sketched in (a). (c) Von Mises stress in the matrix as a function of the radial distance from the nodule, as predicted by the model developed in [7], which was validated against the X-ray diffraction data.…”

“…In parallel, a theoretical model has been developed to provide a quantitative description of the thermo-elastic behavior of the nodules [6]. This model has been used to explain the X-ray findings and uncover the important effect of the conical sectors forming the internal structure of the nodules, which drive residual stress concentrations in the surrounding ferrite regions [7].…”

Analysis of the Correlation between Micro-Mechanical Fields and Fatigue Crack Propagation Path in Nodular Cast Iron

“…For the matrix, the values of the Young's modulus , Poisson's ratio and thermal expansion coefficient were taken from a previous work [40]. The plastic parameters 0 , ∞ , , and were obtained following the framework of the first-order computational Figure 1 (b).…”

Influence of graphite morphology on static and cyclic strength of ferritic nodular cast iron

“…Here, comparing grain size and chemical composition to single phase materials is one possible way. A matrix equivalent material was casted in [21]. Uniaxial tension tests at different temperatures and nominal strain rates provide material parameters subsequently used in micromechanical simulations.…”