Micromechanical impact of solidification regions in ductile iron revealed via a 3D strain partitioning analysis method

Microstrain measurements and damage analysis during tensile loading of intercritical austempered ductile iron

“…The cracks were preferentially located in the MNI as is pointed out by white arrows in Figure 4. This premature cracking in the MNI was also observed for other DI microstructures in previous studies 7–13 . The results show that the ε value for the onset of microcracking decreases slightly as the yield strength ( ) of the material increases.…”

“…In this context, microindentation and nanoindentation tests, in situ microstructural damage observation, digital image correlation (DIC) techniques and computational mechanics, among other methodologies, have been used to investigate the relation between microstructural features and the macroscopic mechanical response of DI materials 7–22 . Microindentation and nanoindentation testings were performed on both the metallic matrix 10,16,18 and the graphite nodules 10,17,18 to assess the mechanical properties of each microconstituent of the DI microstructure.…”

“…The DIC technique has been applied to measure strains at the microstructural level. The analyses were usually aimed at studying the influence of the microstructural heterogeneities on the strain field 8,9,11,12 …”

A simplified formula to estimate the size of the cyclic plastic zone in metals containing elastic particles

“…In each cross-section, plasticity spreads from the crack tip by linking neighboring particles. This preferential propagation of plasticity along chains of neighboring particles corresponds to experimental observations for different types of monotonic loading [33,34]. The impact of the particle spatial arrangement on the local features of the plastic zone is less pronounced when the properties of Al-SiC are considered, altough it remains non-negligible, see figure 5 (c) and (d).…”

Distance map based micromechanical analysis of the impact of matrix heterogeneities on the yield stress of nodular cast iron

“…The need to consider the actual distribution of the matrix heterogeneities in micromechanical analyses of SGI was initially pointed out by Collini and Nicoletto (2005) in relation to the pearlite colonies and was subsequently reasserted by Fernandino et al (2017) and Xu et al ( 2020) in connection with the subdivision of the matrix into first-to-solidify and last-tosolidify regions. However, the development of corresponding microstructural models has been hampered so far by the difficulty of generating realistic 3D representations of the microstructure that include the matrix heterogeneities.…”