摘要
采用薄壁试样研究了温度为980℃、应力为250MPa条件下[001]取向DD6单晶合金的薄壁持久失效行为,结果表明:薄壁试样的持久寿命低于标准圆棒试样,表现出显著的薄壁效应。薄壁试样的厚度和持久寿命之间存在函数关系。薄壁试样持久断口边缘区域氧化严重,内部区域为微孔聚集型断裂,持久断裂模式为"表面氧化-裂纹萌生-扩展"和"内部蠕变损伤"共同作用,且试样越薄,表面氧化程度越大,持久寿命越短。
The stress rupture properties and the fracture character of thin wall specimens of DD6 single crystal superalloy with [001]direction were investigated at 980℃ and 250 MPa.Result showed that stress rupture life of the thin wall specimens was less than that of the standard sample,which exhibited thin wall effect obviously.There was a function relationship between thickness and stress rupture life.The edge zone of the fracture surface of thin wall specimens was oxidized seriously,while the inside zone was affected by microvoid coalescence fracture.The fracture of thin wall specimen was indicated by coalescence of the"surface oxidation-crack initiating-crack growth"and"inside creep damage".The extent of surface oxidation was more serious,while the stress rupture life was shorter.
作者
张丽
于慧臣
郭广平
赵杰
赵澎涛
ZHANG Li;YU Huichen;GUO Guangping;ZHAO Jie;ZHAO Pengtao(Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China;Aviation Key Laboratory of Science and Technology on Material Testing and Evaluation,Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China;Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116085,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2019年第3期627-634,共8页
Journal of Aerospace Power
关键词
单晶合金
薄壁效应
持久性能
断裂机制
微孔聚集型
single crystal superalloy
thin wall effect
stress rupture property
fracture mechanism
microvoid coalescence fracture
