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T122耐熱鋼熱變形加工圖及熱成形性

Processing maps and hot formability of T122 heat resistant steel

  • 摘要: 在Gleeble 3500熱模擬試驗機上進行熱壓縮實驗、采用動態材料模型理論、雙曲線本構方程及Liapunov穩定性判據,建立了T122耐熱鋼熱變形加工圖.利用所建立的加工圖,分析了不同溫度和應變速率下T122鋼的熱成形性及其與顯微組織的關系、結果表明:T122鋼在1085℃以上、應變速率小于0.37s-1壓縮變形時,功率耗散效率達到峰值0.2,此時發生了完全動態再結晶;對于工業熱加工,建議在變形溫度為1085~1150℃和應變速率大于0.13s-1的范圍內選擇加工參數.

     

    Abstract: Based on the dynamic materials model theories, hyperbolic sine equation and two Liapunov stability criteria, the processing maps of T122 heat resistant steel were constructed using the data obtained from isothermal hot compress tests by means of a Gleeble 3 500 simulator. The hot formability of the T122 steel was studied and its relations with microstructure at various temperatures and strain rates were analyzed using the process maps. The result shows that the efficiency of power dissipation increases with the increase in temperature and the decrease in strain rate, The T122 steel exhibited dynamic recrystallization with a peak power dissipation efficiency of 0.2 occurring at the temperature upwards 1085℃ and the strain rate less than 0.37 s-1 The temperature of 1085~1150℃ and the strain rate more than 0.13 s-1 are recommended to set the industrial forming conditions.

     

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