Abstract
The low cycle fatigue (LCF) and fracture behaviors of directionally solidified DZ4 superalloy at 760°C and 800°C were studied. Combined with fracture observation, the fatigue crack initiation and propagation were analyzed. The results show that the LCF of DZ4 superalloy at 760°C and 800°C can be contributed to stress fatigue owing to the main elastic damage in LCF processing. The elastic damage has a favorite relativity to the fatigue life. The high life LCF cracks of DZ4 super alloy favorably initiate at the transverse segment of longitudinal grain boundary. And formation of typical fatigue striation on fatigue crack steady propagation is difficult.
| Original language | English |
|---|---|
| Pages (from-to) | 217-220 |
| Number of pages | 4 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 34 |
| Issue number | 2 |
| State | Published - Feb 2005 |
| Externally published | Yes |
Keywords
- Directionally solidified super alloy
- Elastic damage
- Low cycle fatigue
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