Atomistic characterization of multi nano-crystal formation process in Fe-Cr-Ni alloy during directional solidification: Perspective to the additive manufacturing

Kumar, Sunil and Nandi, Sukalpan and Pattanayek, S K and Madan, M and Kaushik, B and Kumar, R and Krishna, K Gopala (2023) Atomistic characterization of multi nano-crystal formation process in Fe-Cr-Ni alloy during directional solidification: Perspective to the additive manufacturing. Materials Chemistry and Physics, 308 .

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Abstract

The directional solidification phenomenon has been observed in conventional castings and state-of-the-art manufacturing processes like additive manufacturing of steel. Precise control of temperature gradient during directional solidification in the additive manufactured components is essential to get growth and evolution of various crystalline structures, which enhance the properties. In this study, we have used molecular dynamics simulation to investigate the directional solidification of Fe-Cr-Ni steel under a wide range of temperature gradients. It is observed that multiple crystal morphology such as single crystal, nano-grains, multiple stacking faults, twins etc. Form during directional solidification depending on the temperature gradient. Evolution of various crystalline structures characterized by adaptive common neighbour analysis, surface area, volume and corresponding dimensionless aspect ratio. The current investigation adds to the pedagogical understanding of the effects of thermal gradients on the evolution characteristics of crystal morphology evolved during modern additive manufacturing processes.

Item Type:Article
Official URL/DOI:https://10.1016/j.matchemphys.2023.128242
Uncontrolled Keywords:Steel, Molecular dynamics simulations, LAMMPS, Additive manufacturing, Directional solidifications, Austenitic stainless steel, Competitive Grain-growth, Molecular-dynamics, Mechanical-properties, Phase-field, Microstructure simulations, Force, 316L
Divisions:Material Science and Technology
ID Code:9465
Deposited By:HOD KRIT
Deposited On:09 Nov 2023 15:46
Last Modified:09 Nov 2023 15:46
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