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固溶处理和疲劳保载时间对FGH96合金高温疲劳裂纹扩展速率的影响
Effects of Solid Solution Treatment and Fatigue Load Holding Time on Fatigue Crack Growth Rate of FGH96 Superalloy at High Temperature
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- DOI:
- 作者:
- 曾维虎 周晓明 冯业飞 王超渊 邹金文
ZENG Weihu;ZHOU Xiaoming;FENG Yefei;WANG Chaoyuan;ZOU Jinwen
- 作者单位:
- 中国航发北京航空材料研究院先进高温结构材料重点实验室
Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China
- 关键词:
- FGH96 裂纹扩展 热处理
FGH96 crack growth heat treatment
- 摘要:
- 测定了FGH96合金在650℃空气环境中的疲劳裂纹扩展速率,研究了合金显微结构、固溶冷却速率及保载时间对FGH96合金裂纹扩展速率的影响。结果表明,控制固溶后以适当的方式冷却,使得二次和三次γ′相均匀匹配析出,可以获得具有良好疲劳裂纹扩展抗力的合金组织。FGH96合金的高温疲劳裂纹扩展速率随保载时间的增加而增加,其断裂模式为沿晶断裂。
The fatigue crack growth rate of FGH96 alloy was measured in 650 ℃ and air conditions. The effects of microstructure, solid solution cooling rate and fatigue load holding time on the crack growth rate of FGH96 alloy were investigated. The results show that the alloy microstructure with good fatigue crack growth resistance can be obtained by controlling the cooling of the solid solution treatment and making the uniform matching precipitation of the second and third order γ′ phase. The high temperature fatigue crack growth rate of FGH96 alloy increases with the increase of load holding time, and its fracture mode is intergranular fracture.