Exploring microscopic constitutive properties and deformation behavior of the constituent phases in a Fe-12Mn-8Al-0.8C duplex lightweight steel
Year: 2025
Type: article
Abstract: This article investigated the microscopic constitutive properties and deformation behavior of the constituent phases (austenite (γ phase) & ferrite (δ phase)) in a Fe-12Mn-8Al-0.8C duplex lightweight steel through a combination of spherical indentation experiments and crystal plasticity (CP) simulations. Microscopic constitutive properties were systematically extracted through the indentation stress-strain, and their orientation dependence were quantified for the first time. In addition, the noteworthy heterogeneity of intergranular stress-strain partitioning in the experimental steel was revealed in detail by CP simulation. The differences in the microscopic constitutive properties of the constituent phases dominate the microscopic deformation behavior during the initial deformation stage, while as the strain level increases, the slip resistance of the constituent phases tends to approach and their micromechanical anisotropy becomes significantly influential on the stress-strain partitioning. It was found that high-intensity accumulated slip induces the formation of intragranular strain localization and transgranular deformation bands. Strain localization and deformation bands have high-intensity plastic energy dissipation, and their distribution affects the fracture mode of the experimental steel. The result reported in this study can provide significant insights for the development of Fe-Mn-Al-C system lightweight steels.
Authors: Qihan Gao, Haokun Zhu, Yuming Zou, Hua Ding
Institution: Northeastern University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,430
Award: Al元素对新一代高强高韧汽车用钢的作用机制
OpenAlex ID: W4416182156