Incorporation of Dynamic Strain Aging Into a Viscoplastic Self-Consistent Model for Predicting the Negative Strain Rate Sensitivity of Hadfield Steel

Abstract

A new multiscale modeling approach is proposed to predict the contributions of dynamic strain aging (DSA) and the resulting negative strain rate sensitivity (NSRS) on the unusual strain-hardening response of Hadfield steel (HS). Mechanical response of HS was obtained from monotonic and strain rate jump experiments under uniaxial tensile loading within the 10−4 to 10−1 s−1 strain rate range. Specifically, a unique strain-hardening model was proposed that incorporates the atomic-level local instabilities imposed upon by the pinning of dislocations by diffusing carbon atoms to the classical Voce hardening. The novelty of the current approach is the computation of the shear stress contribution imposed on arrested dislocations leading to DSA at the atomic level, which is then implemented to the overall strain-hardening rule at the microscopic level. The new model not only successfully predicts the role of DSA and the resulting NSRS on the macroscopic deformation response of HS but also opens the venue for accurately predicting the deformation response of rate-sensitive metallic materials under any given loading condition.

Effect of strain rate on hydrogen embrittlement susceptibility of twinning-induced plasticity steel pre-charged with high-pressure hydrogen gas

“…Furthermore, the twin thickness was determined as the maximum thickness of a twin lamella, and was measured as the distance between two twin boundaries. from DSA [6,9,31,32]; accordingly, a negative strain rate sensitivity of the flow stress associated with a reduction in probability of dislocation pinning by carbon [33] is observed.…”

Investigations of strain rate, size, and crack length effects on the mechanical response of polycaprolactone electrospun membranes

“…[57][58][59] Positive strain rate sensitivity is attributed to the fact that when the material is deformed at a faster rate, the plastic deformation mechanisms and their interactions with each other are enhanced and increase the stress level. 60,61 Therefore, understanding the fundamental deformation mechanisms of the PCL membranes by observing the microstructure at different strain rates is of utmost importance to discuss the observed strain rate sensitivity (Figure 2). Since electrospun PCL membranes possess hyperplastic behavior during the deformation process, strain rate dependence significantly affects the mechanical properties.…”

Micromechanical modeling of polycrystalline high manganese austenitic steel subjected to abrasive contact

“…1(b). Bal et al [26] have experimentally analyzed the deformation mechanisms in these orientations. Orientation [001] has a tendency to twin predominated deformation in uniaxial compression and multiple slip predominated deformation in tension.…”

“…The crystal plasticity simulations of Lindroos et al [25] have provided some insight into the behavior of Hadfield steel polycrystal microstructures under impact loading and its influence on wear behavior. Dynamic strain aging has been included in the modeling approach by Bal et al [26] to capture its influence on the hardening behavior of the conventional Hadfield steel grade (i.e., 10%-14% Mn and 1.0%-1.4% C). Multiscale linking operation of using the information of a crystal plasticity model at macroscopic scale simulations has also been favored to widen the usability of small scale models of Hadfield steels [27,28].…”