Abstract
The influence of aging temperature (200 to 800℃) on grain boundary segregations in a Ni-20Cr-18W-1Mo superalloy was investigated by scanning electronic microscope (SEM), transmission electron microscopy (TEM), electron microprobe analyzer (EMPA) and a mechanical testing machine. Results indicate that the grain boundary segregation critical time of sulfur and phosphorus decreases with increasing of the aging temperature. Increasing of the aging temperature has a conspicuous effect on the concentration distribution in the grain boundary and the grain core. Grain boundary concentrations of sulfur and phosphorus increase with raising the testing temperature until a peak value is obtained at 650 and 400℃, respectively, which is the essential reason to the declined mechanical properties from 200 to 600℃.
| Original language | English |
|---|---|
| Pages (from-to) | 3043-3049 |
| Number of pages | 7 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 45 |
| Issue number | 12 |
| State | Published - 1 Dec 2016 |
Keywords
- Grain boundary segregation
- Impurity elements
- Mechanical property
- Ni-20Cr-18W-1Mo superalloy