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<p>Metallic materials tend to weaken at elevated temperatures. However, there are specific combinations of temperature and strain rates where an unexpected increase in strength occurs that can be attributed to the complex interactions between the diffused interstitial solute atoms and dislocations that is termed as dynamic strain aging (DSA). Despite being extensively documented, researchers continue to face the challenging task of developing a constitutive model capable of comprehending DSA based on microstructural and physical parameters. The current study employs a constitutive model that incorporates the influence of diffusion kinetics and solute atom concentration to effectively capture DSA in MMFX steel. The model activates under specific combinations of temperature and strain rate required for DSA, while exhibits regular thermomechanical response otherwise. A finite element (FE) modeling framework is developed and integrated into ABAQUS software using a user-defined VUMAT subroutine to perform FE simulations. Additionally, the constitutive model is combined with an energy-based damage model to capture the effect of damage in the MMFX steel. The constitutive modeling results within the activation region of DSA align well with the thermomechanical experimental data available for MMFX steel with an accuracy of up to 95% and root mean square error value of 5&#xa0;MPa. The model serves as a tool to predict the strain rate and temperature combinations for activation of DSA.</p>

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Dynamic strain aging in martensitic microcomposite formable steel (MMFX): a constitutive and numerical modeling approach based on the diffusion kinetics of solute atoms

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Arhum Hassan,
  • Farid Abed

摘要

Metallic materials tend to weaken at elevated temperatures. However, there are specific combinations of temperature and strain rates where an unexpected increase in strength occurs that can be attributed to the complex interactions between the diffused interstitial solute atoms and dislocations that is termed as dynamic strain aging (DSA). Despite being extensively documented, researchers continue to face the challenging task of developing a constitutive model capable of comprehending DSA based on microstructural and physical parameters. The current study employs a constitutive model that incorporates the influence of diffusion kinetics and solute atom concentration to effectively capture DSA in MMFX steel. The model activates under specific combinations of temperature and strain rate required for DSA, while exhibits regular thermomechanical response otherwise. A finite element (FE) modeling framework is developed and integrated into ABAQUS software using a user-defined VUMAT subroutine to perform FE simulations. Additionally, the constitutive model is combined with an energy-based damage model to capture the effect of damage in the MMFX steel. The constitutive modeling results within the activation region of DSA align well with the thermomechanical experimental data available for MMFX steel with an accuracy of up to 95% and root mean square error value of 5 MPa. The model serves as a tool to predict the strain rate and temperature combinations for activation of DSA.