ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Influence of microstructural features on the strain hardening behavior of additively manufactured metallic components

A. Biswas, M. R. G. Prasad, N. Vajragupta, H. u. Hassan, F. Brenne, T. Niendorf, A. Hartmaier, V. Prasad.

Advanced Engineering Materials, Wiley Online Library, Germany, 21, 1900275, (2019)

A method for fitting the disorientation distribution function (MDF) together with its applications to study the influence of MDF on stress distribution in the microstructure and investigation of the grain shape effect.

Additive Manufacturing (AM) has recently become one of the key manufacturing processes in the era of Industry 4.0 because of its highly flexible production scheme. Due to complex thermal cycles during the manufacturing process itself and special solidification conditions, the microstructure of AM components often exhibits elongated grains together with a pronounced texture. These microstructural features significantly contribute to an anisotropic mechanical behavior. In this work, the microstructure and mechanical properties of additively manufactured samples of 316L stainless steel are characterized experimentally and a micromechanical modeling approach is employed to predict the macroscopic properties. The objective of this work is to study the effects of texture and microstructural morphology on yield strength and strain hardening behavior of face-centered cubic additively manufactured metallic components. To incorporate the texture in synthetic Representative Volume Elements (RVE), the proposed approach considers both the crystallographic and grain boundary textures. The mechanical behavior of these RVEs is modeled using crystal plasticity finite element method, which incorporates size effects through the implementation of strain gradients.

Keyword(s): additive manufacturing; anisotropy; crystal plasticity; microstructure morphology; texture
DOI: 10.1002/adem.201900275
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