通过对GH864合金进行不同的固溶处理及时效处理,研究合金中y相的含量变化规律及碳化物回溶析出规律,及其对合金晶粒度的影响和对拉伸性能、蠕变性能及裂纹扩展性能的影响.结果表明,相同热处理制度下,晶粒越均匀细小,强度越高;晶粒尺寸越大,裂纹扩展速率越低;在960~1080℃范围内,y相含量随固溶温度的升高而降低,经过时效处理后y相含量趋于一致,此过程冷却介质对y相含量影响不显著;y相和碳化物交互作用影响合金晶粒尺寸长大,在1020℃以下固溶处理,晶粒长大十分缓慢.此外,合金的晶粒度尺寸对蠕变性能影响显著,存在最佳晶粒度以使性能发挥最优.
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