Abstract
This study reports the fatigue behaviour of 2.25Cr1MoV steel under low cycle fatigue (LCF) loading and creep-fatigue interaction (CFI) loading at 355, 455 and 555 °C. Various hold durations up to 600 s were introduced in the CFI tests at the peak/valley strain under strain or stress control. In LCF tests, the steel exhibited remarkable strengthening at 455 °C, which can be ascribed to the effect of dynamic strain aging. In CFI tests, tensile holds were found more damaging than compressive holds but considerably less harmful than the combined tensile-compressive holds. A modified plastic strain energy approach based on the damage mechanisms was proposed to predict fatigue life under LCF and CFI conditions. The predictions obtained compared very favourably with the experimental results.
| Original language | English |
|---|---|
| Pages (from-to) | 75-84 |
| Number of pages | 10 |
| Journal | Materials at High Temperatures |
| Volume | 33 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2016 |
| Externally published | Yes |
Funding
This work was financially supported by the National Natural Science Foundation of China [grant number 51435012], [grant number 51505325]; and Ph.D. Programs Foundation of Ministry of Education of China [grant number 20130032110018].
| Funders | Funder number |
|---|---|
| National Natural Science Foundation of China | 51435012, 51505325 |
| Ministry of Education of the People's Republic of China | 20130032110018 |
Keywords
- 2.25Cr1MoV steel
- Creep-fatigue interaction
- Fatigue
- Fatigue life prediction
- Plastic strain energy