Abstract
Mechanical properties of Haynes HR160 superalloy at temperatures up to 950°C were investigated. Results show that C*(t) normalizes the effects of load level, temperature and sample size on creep crack propagation. The average time-dependent fracture mechanics parameter, (Ct)avg, was approximated using its value at 0.5 hold time. Correlation was found between creep crack propagation under static and cyclic loadings. Creep was found to play a role in high-temperature crack propagation even under triangular waveform loading. Therefore, the average C*(t) is more proper than (Ct)avg beyond the accumulative transition time. Microstructural characterizations show cracks propagated in a purely intergranular mode under static loading and a mixed mode under cyclic loading. Modeling using the proposed rate estimation number (Ren) shows that creep crack propagation depends on the power input in the creep zone, rupture strain and creep zone size.
| Original language | English |
|---|---|
| Pages (from-to) | 563-584 |
| Number of pages | 22 |
| Journal | American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP |
| Volume | 304 |
| State | Published - 1995 |
| Externally published | Yes |
| Event | Proceedings of the 1995 Joint ASME/JSME Pressure Vessels and Piping Conference - Honolulu, HI, USA Duration: Jul 23 1995 → Jul 27 1995 |