Developing constitutive model parameters via a multi-scale approach

Anglin, Benjamin; Gockel, Brian T.; Rollett, Anthony D.

doi:10.1186/s40192-016-0053-4

Cited by 10 publications

(2 citation statements)

References 47 publications

(60 reference statements)

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“…The voce hardening rule seen in Equation ( 7) imposes the local stress that the shear will experience on the slip system, adapts to the accumulated shear strain within each grain, and applies the input microstructural texture information to predict the texture evolution and stress response of the material [53]:…”

Section: Hardening Rulementioning

confidence: 99%

Crystal Plasticity Modeling to Capture Microstructural Variations in Cold-Sprayed Materials

Williams,

Paudel,

Mujahid

et al. 2024

Crystals

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The high-velocity impact of powder particles in cold-spray additively manufactured (CSAM) parts creates intersplat boundaries with regions of high dislocation densities and sub-grain structures. Upon microstructure and mechanical characterization, CSAM Aluminum 6061 showed non-uniformity with spatial variation in the microstructure and mechanical properties, affecting the overall response of the additively manufactured parts. Post-processing treatments are conducted in as-printed samples to improve particle bonding, relieve residual stresses, and improve mechanical properties. In this work, we attempt to implement the effects of grain size and distribution of smaller grains along the intersplat boundaries using the grain size distribution function and powder size information to accurately predict the deformation response of cold-sprayed material using a mean-field viscoplastic self-consistent (VPSC) model. The incorporation of an intersplat boundary term in the VPSC model resulted in a stress–strain response closely matching the experimental findings, preventing the superficially high stresses observed due to Hall–Petch effects from ultra-fine-grain structures. Likewise, the results from the grain analysis showed the combined effects of grain size, orientation, and intersplat mechanisms that captured the stresses experienced and strain accommodated by individual grains.

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Section: Hardening Rulementioning

confidence: 99%

Crystal Plasticity Modeling to Capture Microstructural Variations in Cold-Sprayed Materials

Williams,

Paudel,

Mujahid

et al. 2024

Crystals

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“…The relationship of these parameters with the stress-strain curve can be found in the research work of Anglin et al (Fig. 1) [45]. The affine linearization was used for the calculations.…”

Section: Crystal Plasticity Modelingmentioning

confidence: 99%

Strengthening of Duplex Stainless Steel Processed by Equal Channel Angular Pressing (Ecap)

Serrano-Muñoz¹,

Chand²,

Signorelli³

et al. 2022

SSRN Journal

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Strengthening of duplex stainless steel processed by equal channel angular pressing (ECAP)

Serrano-Muñoz

Chand

Signorelli

et al. 2022

Int J Adv Manuf Technol

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This manuscript presents the study of the microstructural evolution, plastic anisotropy, and mechanical behavior of a duplex stainless steel (DSS) processed by the equal channel angular pressing (ECAP) technique. The ECAP process produced shear bands affecting both phases, austenite and ferrite, which in turns act as preferential sites for the appearance of the new ultrafine grains. Microstructural observations indicated grain sizes smaller than 300 nm in both phases. However, marked differences in the grain boundary misorientations were observed. Most ferrite grain boundaries showed low misorientations (average misorientation of 30°). In contrast, the austenite grain boundaries were mainly dominated by high-angle grain boundaries (average misorientation of 39°). The ECAP processing allowed to reach a yield strength over 1.1 GPa after one ECAP pass. Dislocations formed walls in the ferrite, while they were distributed evenly in the austenite grains creating plastic gradients between the two phases. Through the visco-plastic self-consistent model, it was found that austenite and ferrite strain hardening at different rates, generating plastic instabilities at different strain magnitudes. In this way, it was shown that austenite is the phase that provides more hardening while ferrite provides ductility. Regarding the anisotropy of the steel, crystal plasticity simulations showed that during the first passes of ECAP, the Lankford coefficients increase notably due to the heterogeneous microstructure of sheared grains with a higher density of defects forming subgrains in ferrite than austenite. Moreover, the austenite was more responsible for the larger planar anisotropy ($$\Delta r$$ Δ r = 2.18) values than ferrite ($$\Delta r$$ Δ r = 1.67) after two ECAP passes.

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Developing constitutive model parameters via a multi-scale approach

Cited by 10 publications

References 47 publications

Crystal Plasticity Modeling to Capture Microstructural Variations in Cold-Sprayed Materials

Crystal Plasticity Modeling to Capture Microstructural Variations in Cold-Sprayed Materials

Strengthening of Duplex Stainless Steel Processed by Equal Channel Angular Pressing (Ecap)

Strengthening of duplex stainless steel processed by equal channel angular pressing (ECAP)

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