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新型微合金化C-Mn-Al高強度鋼的熱變形行為

Hot deformation behavior of a new microalioyed C-Mn-AI high strength steel

  • 摘要: 通過Gleeble-1500熱模擬單軸壓縮試驗,研究了一種含1.79% Al (質量分數)的以Al替代Si微合金化高強度鋼在溫度為900-1100℃、應變速率為0.01-30 s-1條件下的熱變形行為.建立了考慮應變量對材料常數影響的雙曲正弦本構方程,利用建立的本構方程預測的應力-應變曲線與實驗值吻合良好,表明建立的本構方程可以對實驗鋼的流變應力給出相對準確的預測.建立了實驗鋼的加工圖,根據加工圖分析確定了實驗鋼的動態再結晶區為1000-1100℃和0.01-1 s-1.組織觀察表明在動態再結晶區實驗鋼發生了動態再結晶,而失穩區對應的組織出現了變形集中帶或“項鏈”組織.最后將建立的本構方程和加工圖聯合運用,為更全面地研究實驗鋼在不同變形條件下的熱變形行為提供了方法.

     

    Abstract: The compressive deformation behavior of a new microalloyed high-strength steel containing 1.79% Al was investigated at temperatures from 900 to 1100℃ and strain rates from 0.01 to 30 s-1 on a Gleeble-1500 thermo-simulation machine. A hyperbolic sine equation with strain-dependent constants was developed for the steel. The predicted flow stress curves by the constitutive equation well agreed with experimental results, indicating that the constitutive equation can give a relatively accurate estimate of flow stress for the steel. According to processing map analysis, the dynamic recrystallization zone of the steel was determined as 1000 to 1100℃ and 0.01 to 1 s-1. Microstructure observation showed that dynamic recrystallization occurred in this dynamic recrystallization zone, and in the instability zone, flow localization and necklace structure was observed. Finally, a combination of the constitutive equation and processing map provided a method for comprehensively investigating the hot deformation behavior of the steel under different conditions.

     

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