航空材料学报2025，Vol.45Issue(5)：123-130,8.DOI:10.11868/j.issn.1005-5053.2025.000133
一种耐腐蚀单晶高温合金不同温度的蠕变性能
Creep properties of a corrosion resistant single crystal superalloy at different temperatures
史振学 1陈卉 1王效光 1刘世忠1
作者信息
- 1. 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,北京 100095
- 折叠
摘要
Abstract
The creep properties of a corrosion resistant single crystal superalloy at 760℃/800 MPa,980℃/250 MPa and 1120℃/130 MPa are investigated.The creep fracture microstructure,fracture characteristic and dislocation morphology under different conditions are analyzed using scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results indicate that the alloy exhibits good creep performance at 760℃/800 MPa,980℃/250 MPa and 1120℃/130 MPa,with its creep curves showing similar three-stage creep characteristics.As temperature increases and stress decreases,the creep lives of the initial and acceleration stages becomes shorter,while the creep life of the steady-state stage increases.Compared to 980℃/250 MPa and 1120℃/130 MPa,the creep rate during the initial stage is faster at 760℃/800 MPa.Under 760℃/800 MPa conditions,the γ′phase retains its cuboidal morphology.The dislocation tangles forming in the matrix channels and stacking faults forming from some dislocation cutting γ′phase have a reinforcing effect.The creep fracture morphology of the alloy involves cleavage-like and ductile dimple mixed fracture.At 980℃/250 MPa and 1120℃/130 MPa,the alloy exhibits obvious rafting behavior and topological inversion of γ′phase and γ phase has finished.A high-density dislocation network forming at the γ/γ′interfaces have a reinforcing effect.No stacking faults are observed to form.Dislocations cut into the γ′phase during the later stage of creep.The creep fracture morphology is dominated by ductile dimple fracture.At 1120℃/130 MPa,a small amount of lamellar σ phases precipitate along specific directions in the alloy,indicating good microstructural stability.关键词
单晶高温合金/蠕变性能/组织演化/断裂特征/位错形貌Key words
single crystal superalloy/creep property/microstructure evolution/fracture characteristic/dislocation morphology分类
航空航天引用本文复制引用
史振学,陈卉,王效光,刘世忠..一种耐腐蚀单晶高温合金不同温度的蠕变性能[J].航空材料学报,2025,45(5):123-130,8.
