Abstract
This research work developed a decoupled thermo-mechanical-microstructural (TMM) numerical framework to simulate a multi-pass welding process. The numerical framework was applied to evaluate the effect of operating parameters on the weldability of a twinning induced plasticity (TWIP) steel considering metallurgical defects and the weld joint’s mechanical properties. The thermo-mechanical model was solved numerically using a finite element model (FEM). After that, the simulation of the thermo-microstructural field was performed through a combined probabilistic approach Monte Carlo (MC)-Voronoi tessellation. The staggered solution approach and the optimized FE macro-scale mesh further improved the convergence and reduced computing time. The correlation of TMM model estimations with thermal history measurements and mechanical and metallographic characterizations helped explain the variation of post-welding mechanical properties. The nature of residual stresses in the TWIP steel joint was correlated with the heat flux in the critical weld regions. The thermal gradients were also correlated with the weld regions that underwent grain growth and grain size reduction. The grain growth simulation performed by the MC-Voronoi model was in good agreement with the hardness reduction in the heat-affected zone (HAZ). The grain size distribution in the HAZ produced an unexpected tensile elongation.
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Abbreviations
- C P :
-
Specific heat (J/kg °C)
- T :
-
Temperature (°C)
- t :
-
Time (s)
- k :
-
Thermal conductivity (W/m °C)
- q f, r :
-
Heat source (W/m3)
- a, b, cf, cr :
-
Geometric parameters of double ellipsoidal heat source (m)
- Q :
-
Heat input (J/m)
- V :
-
Voltage (V)
- I :
-
Current intensity (A)
- v :
-
Welding speed (m/s)
- ff, fr :
-
Weight factors (-)
- x, y, z :
-
Global Cartesian coordinates (inertial) (m)
- C :
-
Specific heat matrix (J/kg °C)
- \( \dot{T} \) :
-
Transient temperature (°C)
- r p :
-
Thermal load vector (W/m2)
- r q :
-
Volumetric heat vector (W/m3)
- \( {R}_{p_{\mathrm{ext}}} \) :
-
External forces vector (N)
- \( {R}_{p_{\mathrm{int}}} \) :
-
Internal forces vector (N)
- N i :
-
Vector of shape functions (-)
- B :
-
Vector of derivates of shape functions (-)
- V :
-
Volume (m3)
- A :
-
Area (m2)
- h :
-
Convection coefficient (W/m2 °C)
- Δt :
-
Time increment (s)
- Q inf :
-
Material parameter (MPa)
- b c :
-
Material parameter (-)
- {s}:
-
Deviation stress (MPa)
- \( \overrightarrow{u} \) :
-
Vector of displacements (m)
- F :
-
Yield criterion (MPa)
- E :
-
Young modulus (MPa)
- R :
-
Force residual of FE mechanical model (N)
- dT :
-
Temperature increment vector (°C)
- K TH :
-
Thermal stiffness matrix (MPa/°C)
- K T :
-
Total stiffness matrix (MPa)
- K el :
-
Elastic matrix (MPa)
- K pl :
-
Plastic matrix (MPa)
- v r :
-
Poisson ratio (-)
- C M :
-
Stiffness matrix (MPa)
- \( \overrightarrow{\boldsymbol{N}} \) :
-
Vector of shape functions of six-node rectangular element (-)
- a r :
-
Height of rectangle element (m)
- b r :
-
Base of rectangle element (m)
- s, l :
-
Local coordinates of the six-node rectangular element (m)
- tMCS :
-
Monte Carlo time step (s)
- n1, K1 :
-
EDB model constants (-)
- n :
-
Growth exponent (-)
- α :
-
Thermal expansion coefficient (°C−1)
- α r :
-
Parameter of full Newton-Raphson method (-)
- ρ :
-
Density (kg/m3)
- ∇:
-
Gradient operator (m−1)
- ξ :
-
Non-inertial coordinate (m)
- η :
-
Arc efficiency (-)
- β :
-
Environmental heat losses (W/m2)
- Ω:
-
Calculation domain (-)
- θ :
-
Transient integration parameter (-)
- σ 0 :
-
Radius of the yield surface (MPa)
- σ 1 :
-
Yield stress at zero plastic strain (MPa)
- ϕ :
-
Incompatibility (non-linear term) (N/m3)
- ε th :
-
Thermal strain (-)
- ε el :
-
Elastic strain (-)
- ε pl :
-
Plastic strain (-)
- ε Total :
-
Total strain (-)
- σ ij :
-
Stress tensor (MPa)
- ρ ij :
-
Body forces (N/m3)
- \( {\overline{\varepsilon}}^{\mathrm{pl}} \) :
-
Effective plastic strain rate (-)
- \( {\dot{\varepsilon}}^{\mathrm{pl}} \) :
-
Plastic strain rate (-)
- L T :
-
Diagonal matrix (-)
- σ :
-
Incremental stress (MPa)
- ε :
-
Incremental strain (-)
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Funding
This study is supported by the National Council on Science and Technology (Consejo Nacional de Ciencia y Tecnología-México) during the project CB-2012-01-0177572. The present research project was also supported by the Coordinación de la Investigación Científica-UMSNH (México) (CIC-1.8). Víctor García’s studies were sponsored by the National Council on Science and Technology (Consejo Nacional de Ciencia y Tecnología-México), N.B. 577720.
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García-García, V., Mejía, I., Reyes-Calderón, F. et al. Thermo-mechanical-microstructural simulation of double-pass welding process in a TWIP steel by FE formulation and probabilistic model. Int J Adv Manuf Technol 111, 1115–1134 (2020). https://doi.org/10.1007/s00170-020-06118-8
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DOI: https://doi.org/10.1007/s00170-020-06118-8