800 ℃下GH4169和GH4586高温合金的疲劳性能
Fatigue properties of GH4169 and GH4586 superalloys at 800 ℃
刘昕杰 1陈雨 1周根树 1张权明 2华小明 2詹腾 2陈昆宇2
作者信息
- 1. 西安交通大学金属材料强度国家重点实验室,陕西西安 710049
- 2. 西安航天发动机有限公司,陕西西安 710100
- 折叠
摘要
为了为两种我国广泛运用于航天发动机各部件的GH4169和GH4586镍基高温合金在面临苛刻服役条件下的安全使用提供依据,采用高频疲劳试验机测试了两种合金在800℃下的疲劳性能并绘制了 S-N曲线,采用扫描电镜对它们的疲劳断口形貌进行了观察,结合显微组织观察分析了 800 ℃下两种合金的疲劳断裂特征.结果表明:在800℃下,GH4169合金中长径比较大的针状8相会引发应力集中,影响其疲劳性能;GH4586合金晶界处稳定的颗粒状TiN对蠕变的抑制及其与细小碳化物第二相强化的共同作用可提高合金的疲劳性能.GH4169和GH4586合金在800 ℃下的平均疲劳强度极限分别为363.33和490.00 MPa.
Abstract
In order to provide a basis for the safe use of GH4169 and GH4586 nickel based superalloys which widely used in various components of aerospace engines in China under harsh service conditions,the fatigue properties of the two alloys at 800 ℃ was tested using a high-frequency fatigue testing machine and S-N curves were drawn.The fatigue fracture morphology of the two alloys was observed using scanning electron microscopy,and the fatigue fracture characteristics of the two alloys at 800 ℃ were analyzed by microstructure observation.The results show that at 800 ℃,the needle-like δ phase with large aspect ratio in the GH4169 alloy induces stress concentration,which affects its fatigue properties,and the inhibition of creep by the stable granular TiN at the grain boundaries of the GH4586 alloy and its combination with the second phase strengthening effect of TiN particles and fine carbides are the main reasons for the superior fatigue properties of the GH4586 alloy.The average fatigue strength limits of the GH4169 and GH4586 alloys at 800 ℃ are 363.33 and 490.00 MPa,respectively.
关键词
GH4169合金/GH4586合金/高温疲劳性能/晶界相Key words
GH4169 alloy/GH4586 alloy/high temperature fatigue property/grain boundary phase引用本文复制引用
基金项目
西安市科技创新计划(201805064ZD15CG48)
出版年
2024
NETL
NSTL
万方数据