摘要
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γ′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,γ′相含量随固溶温度的升高而降低,经过时效处理后γ′相含量趋于一致,此过程冷却介质对γ′相含量影响不显著;γ′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。
Different solution treatments and aging treatments were carried out for GH864 superalloy. The change rule of gamma' phase content and re-dissolution and precipitation rule of carbides were studied, as well as their effects on grain size, tensile property, creep property and crack growth behavior. Results indicate that by the same heat treatment schedule, the smaller and more uniform the grain sizes are, the higher the strength is; the larger the grain sizes are, the lower the crack growth rate is. In the temperature range of 960-1080 degrees C, gamma' phase content decreases with increasing of the solution temperature, but the total amount of gamma' phases is equal after dual aging treatment. But the cooling medium has no significant influence on the gamma' content. Because of the interaction between gamma' phase and carbides, the grain grows slowly below 1020 degrees C. Besides, the grain size has an obvious effect on the creep property and there is an optimum grain size to obtain the best performance.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第9期1565-1570,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50831008)资助
