摘要
通过对DD3单晶高温合金试棒进行1030℃/196MPa、1040℃/177MPa和1050℃/140MPa蠕变实验,并对试样断口形貌及其组织进行观察和分析,研究了第一代单晶高温合金DD3的高温蠕变断裂行为。蠕变试验结果表明:在1030～1050℃条件下,DD3合金具有优良的蠕变性能;蠕变开始不到10h,合金即进入稳态蠕变阶段。断口形貌及组织分析表明:高温条件下的DD3单晶高温合金蠕变断裂裂纹萌生于微孔,断裂模式为微孔聚集型断裂。
Based on creep tests, fracture characteristic and microstructure analysis, the creep rupture behavior of DD3 single crystal superalloy at elevated temperatures were investigated. The experimental results show that DD3 single crystal superalloy exhibits superior creep properties at 1030 N 1050℃. The primary creep stage was rather short and the steady creep stage began after creeping for less than 10h. Fracture characteristic and microstructure analysis revealed that microcracks initiated from micropores at high temperatures. The creep rupture of DD3 single crystal superalloy at high temperatures was characteristic of the convergence of micropores.
出处
《失效分析与预防》
2008年第3期28-31,共4页
Failure Analysis and Prevention
关键词
DD3
单晶高温合金
高温蠕变
断裂行为
DD3
single crystal superalloy
elevated temperature creep
rupture behavior
