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<p>The damage evolution during the hot working of Fe-Cr-Mo-Mn steel significantly affects component performance. Dynamic recrystallization (DRX) softens the material by reducing dislocation density, deformation energy, and flow stress, delaying void nucleation and reducing void coalescence. This study develops an extended GTN-Thomason model incorporating DRX effects using the DRX percentage (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11665_2025_10913_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="33" /> </InlineMediaObject> <EquationSource Format="TEX">\({X}_{\text{drx}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>X</mi> <mtext>drx</mtext> </msub> </math></EquationSource> </InlineEquation>) and void volume fraction to describe damage accumulation. Exponential functions capture the influence of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11665_2025_10913_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="33" /> </InlineMediaObject> <EquationSource Format="TEX">\({X}_{\text{drx}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>X</mi> <mtext>drx</mtext> </msub> </math></EquationSource> </InlineEquation> on void nucleation strain and critical void volume fraction. The model integrates DRX kinetics and accounts for strain rate sensitivity and temperature dependence. Finite element simulations and a hybrid numerical-experimental approach calibrate the model, validated through experiments under varying stress states and temperatures.</p>

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Extended GTN-Thomason Model for Modeling Ductile Fracture of Fe-Cr-Mo-Mn Steel at a Wide Range of Stress States and Temperatures

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Fan Wang,
  • Guoqiang Liu,
  • Depeng Shen,
  • Ning Guo,
  • Fu Guo,
  • Zhen Zhang,
  • Wei Sun,
  • Bingtao Tang

摘要

The damage evolution during the hot working of Fe-Cr-Mo-Mn steel significantly affects component performance. Dynamic recrystallization (DRX) softens the material by reducing dislocation density, deformation energy, and flow stress, delaying void nucleation and reducing void coalescence. This study develops an extended GTN-Thomason model incorporating DRX effects using the DRX percentage ( \({X}_{\text{drx}}\) X drx ) and void volume fraction to describe damage accumulation. Exponential functions capture the influence of \({X}_{\text{drx}}\) X drx on void nucleation strain and critical void volume fraction. The model integrates DRX kinetics and accounts for strain rate sensitivity and temperature dependence. Finite element simulations and a hybrid numerical-experimental approach calibrate the model, validated through experiments under varying stress states and temperatures.