先進超超臨界汽輪機葉片用鎳基合金的熱變形行為

先進超超臨界汽輪機葉片用鎳基合金的熱變形行為Hot deformation behavior of Ni-based alloy used for advanced ultra-supercritical steam turbine blades

利用Gleeble-3800熱模擬試驗機，在溫度為950~1150 ℃、應變速率為0.01~10 s-1、變形量為60%條件下，研究汽輪機葉片用GY200鎳基合金的高溫塑性變形及動態再結晶行為，并繪制了合金的熱加工圖。結果表明：GY200合金的真應力–應變曲線具有動態再結晶特征，峰值應力隨變形溫度的降低或應變速率的升高而增加，發生動態再結晶的臨界應變隨溫度增加而降低。在真應力–應變曲線的基礎上，建立了材料熱變形本構方程，其熱激活能為353.792 kJ/mol，表明利用W替代合金中的Mo后，降低了合金的熱激活能。合金的最佳熱加工的溫度區間為1000~1150 ℃，應變速率0.01~0.1 s-1，效率值達到0.3以上。

The hot deformation characteristics of the GY200 Ni-based alloy at the temperature range of 950-1150 ℃ and strain rate range of 0.01-10 s–1 under deformation of 60% were investigated by means of hot compression tests with Gleeble-3800. The results show that the softening mechanism of the dynamic recrystallization is a feature of high-temperature flow stress-strain curves of the GY200 Ni-based alloy, the peak stress increases with the decrease of deformation temperature or the increase of strain rate, and the critical strain reduces with the decrease of deformation temperature. The constitutive equation for GY200 alloy was established on basis of the true stress–strain curves. The activation energy(Q) of the alloy is obtained as about 353.792 kJ/mol. Using W to replace Mo, the thermal activation energy of GY200 alloy is reduced. The processing map is developed based on the peak stress at different strain rate and showing variations of the efficiency of power dissipation related to temperature and strain rate. The instability zone on the processing map is located at the temperature range of 1030-1170 ℃ and stain rates of 1-10 s-1. The optimum hot working temperature and strain rate interval are 1000-1150 ℃ and 0.01-0.1 s-1, respectively.

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