镍基高温合金端淬梯度冷却过程中γ′相演化规律

发布时间：2018-04-05 15:33

  本文选题：镍基高温合金　切入点：γ′相　出处：《中国有色金属学报》2017年02期

【摘要】：研究热处理过程中不同冷却速率对镍基高温合金中γ′相析出的影响;采用Thermal-calc热力学计算、差热分析技术,确定新型镍基高温合金的γ′相完全固溶温度;采用有限元模拟、扫描电镜分析等方法,研究端淬梯度冷却过程中合金的温度场分布及γ′相析出和演化规律。结果表明:该合金γ′相完全固溶温度为1140℃,在端淬梯度冷却过程中,距离喷水端越远,冷却速度越低;随着冷却速度的逐渐减小,γ′析出相的体积分数逐渐增加,γ′析出相的形貌由球形向方形逐渐转变,平均尺寸逐渐增大;时效后合金中析出大量细小三次γ′相,合金硬度增加。
[Abstract]:The effect of different cooling rates on 纬 'phase precipitation in nickel-based superalloy during heat treatment was studied, the complete solution temperature of 纬' phase was determined by Thermal-calc thermodynamic calculation and differential thermal analysis, and the finite element simulation was used.The temperature field distribution, 纬 'phase precipitation and evolution of the alloy during the end quenching gradient cooling were studied by scanning electron microscopy (SEM).The results show that the complete solution temperature of 纬 'phase is 1140 鈩，

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