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Numerical Simulation of Microstructure Evolution for SA508-3 Steel During Inhomogeneous Hot Deformation Process

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Abstract

Based on hot compression tests by a Gleeble-1500D thermo-mechanical simulator, the flow stress model and microstructure evolution model for SA508-3 steel were established through the classical theories on work hardening and softening. The developed models were integrated into 3D thermal-mechanical coupled rigid-plastic finite element software DEFORM3D. The inhomogeneous hot deformation (IHD) experiments of SA508-3 steel were designed and carried out. Meanwhile, numerical simulation was implemented to investigate the effect of temperature, strain and strain rate on microstructure during IHD process through measuring grain sizes at given positions. The simulated grain sizes were basically in agreement with the experimental ones. The results of experiment and simulation demonstrated that temperature is the main factor for the initiation of dynamic recrystallization (DRX), and higher temperature means lower critical strain so that DRX can be facilitated to obtain uniform fine microstructure.

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Abbreviations

b:

Module of Burgers vector

Ddrx:

DRX grain size, μm

kd:

Material constant

nd:

Material constant

Q:

Deformation activation energy, kJ/mol

R:

Gas constant

T:

Temperature, °C

U:

Multiplication term, m−2

XD:

Percentage of DRX, %

Z:

Zener-Holomon parameter

Ω:

Softening amount of dynamic recovery

α:

Empirical coefficient

ℰ :

Strain

ℰ c :

Critical strain

ℰ p :

Peak strain

ℰ :

Strain rate, s−1

µ:

Shear modulus, MPa

ρ:

Dislocation density, m−2

ρ0:

Initial dislocation density, m−2

ρs:

Epitaxial saturated dislocation density, m−2

σ:

Flow stress, MPa

σo:

Initial stress, MPa

σs:

Saturated stress, MPa

σss:

Steady stress, MPa

σWH:

Epitaxial stress, MPa

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Author information

Authors and Affiliations

  1. National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 200030, Shanghai, China

    Da-shan Sui (Doctor, Associate Professor), Fei Chen, Pei-pei Zhang & Zhen-shan Cui

Authors
  1. Da-shan Sui
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  2. Fei Chen
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  3. Pei-pei Zhang
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  4. Zhen-shan Cui
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Corresponding author

Correspondence to Da-shan Sui.

Additional information

Foundation Item: Item Sponsored by National Basic Research Program (973 Program) of China (2011CB012903); National Natural Science Foundation of China (51075270)

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Sui, Ds., Chen, F., Zhang, Pp. et al. Numerical Simulation of Microstructure Evolution for SA508-3 Steel During Inhomogeneous Hot Deformation Process. J. Iron Steel Res. Int. 21, 1022–1029 (2014). https://doi.org/10.1016/S1006-706X(14)60178-3

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60178-3

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