Abstract
In the temperature range 200-400 degree C the Ni-base superalloy, N901, develops marked dynamic strain ageing effects in its tensile behavior. These include inverse strain rate sensitivity, especially in UTS values, strongly serrated stress-strain curves and a heavily sheared failure mode at the higher test-temperatures. As for steels these effects seem to be due to interactions between the dislocations and the interstitial carbon atoms present. The results of tensile and fatigue threshold tests carried out between 20 degree C and 420 degree C are reported and the fatigue behavior is discussed in terms of the effects of surface roughness induced closure, temperature and strain aging interactions.
| Original language | English |
|---|---|
| Title of host publication | Fatigue 84 |
| Subtitle of host publication | proceedings of the 2nd International conference on fatigue and fatigue thresholds; Birmingham, 3-7 September 1984 |
| Editors | C.J. Beevers, J. Backlund, P. Lukacs, J. Schijve, R.O. Ritchie |
| Pages | 1371-1378 |
| Number of pages | 8 |
| Volume | 3 |
| Publication status | Published - Dec 1984 |
| Event | 2nd international conference on fatigue and fatigue thresholds - Birmingham, United Kingdom Duration: 3 Sept 1984 → 7 Sept 1984 |
Conference
| Conference | 2nd international conference on fatigue and fatigue thresholds |
|---|---|
| Abbreviated title | Fatigue 84 |
| Country/Territory | United Kingdom |
| City | Birmingham |
| Period | 3/09/84 → 7/09/84 |
Keywords
- measurements fatigue of materials
- fatigue gas turbines
- high temperature metals testing
- dynamic strain ageing
- near-threshold fatigue cracks
- serrated stress-strain curves
- super alloy N901
- turbine-discs
- nickel and alloys