Analysis of χ phase precipitation in aged 2205 duplex stainless steel
Heping Liu , Hu’er Sun , Bin Liu , Dazhao Li , Fenger Sun , Yongtao Zhang
Journal of Wuhan University of Technology Materials Science Edition ›› 2015, Vol. 30 ›› Issue (3) : 591 -595.
Analysis of χ phase precipitation in aged 2205 duplex stainless steel
Analysis of χ phase precipitation in 2205 duplex stainless steel aged at 700 and 750 °C has been investigated systematically. The experimental results showed that χ phase forms prior to the precipitation of σ phase and disappears once σ phase starts to precipitate. This phenomenon indicates that σ phase nucleated and consumed the χ phase. The σ phase nucleated mainly at ferrite/austenite interface and grew inwards into the ferrite phase. The morphology of σ phase reveals a coral-like structure at the temperature of 700 °C for 120 min followed by quenching in water. The decomposition of ferrite occurs via the following eutectoid reaction: F→σ+γ 2. The selected area diffraction pattern of zone axes is$[\bar 31\bar 3]_\chi ||[\bar 31\bar 3]_\delta $, indicating a characteristic orientation relationship between χ phase and δ-ferrite.
duplex stainless steel / χ phase / σ phase / microstructure analysis
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
/
| 〈 |
|
〉 |
PDF
