Abstract
Deformation and microstructure evolution in Co-33Ni-20Cr-10Mo superalloy during hot deformation are studied by carrying out compression tests between 950 °C and 1200 °C with an increment of 50 °C at strain rates of 0.1, 1, 10, and 30 s-1. The flow curves obtained for the aforementioned strain rates in this temperature range show that this alloy has high work-hardening characteristics; this is due to the strong dislocation-solute interactions associated with dynamic strain aging (DSA). Microstructures deformed at temperatures up to 1050 °C consist of numerous deformation twins and highly dense dislocations, which are attributed to the high activation energy for deformation and the relatively low strain-rate sensitivity m in the temperature range of 950 °C to 1200 °C. Dynamic recrystallization (DRX), which is dependent on the strain rate, occurs at T = 1000 °C, 1050 °C, 1100 °C, 1150 °C, and 1200 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 1457-1468 |
| Number of pages | 12 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 40 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2009 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys