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SCM435鋼熱變形動態再結晶動力學模型參數的確定

Parameters determination of the dynamic recrystallization kinetics model for SCM435 steel during hot compressive deformation

  • 摘要: 通過分析冷鐓鋼SCM435在溫度為950~1150 ℃、應變速率為0.1~1 s-1范圍內發生動態再結晶的熱/力模擬試驗數據,利用其應變硬化速率θ與流變應力σθ-σ曲線,準確確定了其發生動態再結晶的臨界應變εc、峰值應變εp、臨界應力σc和峰值應力σp,用應力-應變(σ-ε)曲線方法計算SCM435鋼的動態再結晶Avrami動力學曲線和時間指數n.結果表明:SCM435鋼發生動態再結晶的臨界應變與峰值應變的平均比值εc/εp=0.73,動態再結晶Avrami時間指數平均值n=1.91;在溫度950~1150℃,應變速率0.1~1s-1范圍內,應變速率是SCM435鋼的動態再結晶動力學敏感因素,溫度對其影響不大;動態再結晶率50%的時間t50與應變速率成反比.

     

    Abstract: By analyzing the thermal/mechanical simulation test data under dynamic recrystallization (DRX) of cold heading steel SCM435 in a temperature range of 950 to 1 150% and a strain rate range of 0.1 to 1 s-1 such characteristic Values as critical strain εc,peak strain εp,critical stress σc and peak stress σp.were derived from the curves of strain hardening rate to flow stress (θ-σ).The Avrami kinetic curves of dynamic recrystallization and the time exponent n of SCM435 steel were calculated by the stress-strain (σ-ε) method.It is shown that the average value of εc/εp,is 0.73 and the average value of n was 1.91 under DRX.The DRX Avrami kinetic of SCM435 steel is sensitive to strain rate and not temperature-sensitive in the temperature range of 950 to 1 150% and the strain rate of 0.1 to 1 s-1.The time when the crystallization ratio is 50% is inversely proportional to strain rate.

     

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