航空材料学报2011，Vol.31Issue(z1)：146-150,5.
20kHz频率下DZ125定向凝固高温合金的超高周疲劳行为研究
Ultra-high Cycle Fatigue Behaviors of Directionally Solidified Superalloy DZ125 at a Frequency of 20kHz
顾玉丽 1刘昌奎 1何玉怀 1陶春虎1
作者信息
- 1. 北京航空材料研究院中航,试金石,检测科技有限公司,北京,100095
- 折叠
摘要
Abstract
The ultra-high cycle fatigue behavior of DZ12S alloy was studied using the ultrasonic fatigue testing technique under the load frequency of 20kHz and load ratio of R =- 1. The results show that DZ125 alloy still failed after 108 cycles. The analysis of the failed specimens using scaning electron microscopy ( SEM ) reveals that all ultra-high cycle fatigue cracks initiated at the surface of the specimens. Quantitative estimation of the fracture initiation life is 97. 3% of the total life. Using electron backscatter diffraction ( EBSD) technique, the crystal orientation change during the ultra-high cycle fatigue of superalloy DZ12S after conventional heat treatments, the crystal rotation angle will be slightly increased with the increase of the applied stress amplitude, the depth of deformation is minimum near the final fracture zone. After the frequency correction, the ultra-high cycle fatigue S-N curve is good agreement with the traditional fatigue S-N curve.关键词
定向凝固高温合金/超高周疲劳/萌生寿命/疲劳变形Key words
directionally solidification superalloy/ultra-high cycle fatigue/initiation life/fatigue deformation引用本文复制引用
顾玉丽,刘昌奎,何玉怀,陶春虎..20kHz频率下DZ125定向凝固高温合金的超高周疲劳行为研究[J].航空材料学报,2011,31(z1):146-150,5.
