Abstract
Phosphorus segregation to grain boundaries in a commercial grade 2.25Cr–1Mo steel subjected to a variety of heat treatments has been examined using X-ray spectroscopy in a field emission gun scanning transmission electron microscope. A number of points have been established. Segregation of phosphorus to grain boundaries is present after austenitising and quenching.
Tempering for 2 h at 650uC enhances phosphorus segregation during the following aging processes at 520uC. A higher austenitisation temperature (larger grain size) makes subsequent segregation more intense. For specimens austenitised at 1100uC, the concentration of phosphorus segregated to grain boundaries steadily increases with aging time after tempering (from 0 to 210 h). For specimens austenitised at 900uC, the phosphorus concentration at grain
boundaries first increases, reaches a maximum at an aging time of y210 h and then decreases with aging time (480 h).
Tempering for 2 h at 650uC enhances phosphorus segregation during the following aging processes at 520uC. A higher austenitisation temperature (larger grain size) makes subsequent segregation more intense. For specimens austenitised at 1100uC, the concentration of phosphorus segregated to grain boundaries steadily increases with aging time after tempering (from 0 to 210 h). For specimens austenitised at 900uC, the phosphorus concentration at grain
boundaries first increases, reaches a maximum at an aging time of y210 h and then decreases with aging time (480 h).
| Original language | English |
|---|---|
| Pages (from-to) | 85-92 |
| Number of pages | 8 |
| Journal | Materials Science and Technology |
| Volume | 21 |
| Issue number | 1 |
| Publication status | Published - 2005 |
Keywords
- Segregation
- Grain boundaries
- Steel
- Phosphorus
ASJC Scopus subject areas
- General Materials Science