Abstract
X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to investigate the surface composition and the microstructure of Haynes 214 Ni-based alloy after 500h cyclic exposure to two carburizing atmospheres: CH 4 (2%)-H 2 (98%) at 800°C, and CH 4 (10%)-H 2 (90%) at 1100°C. The depth distribution of various elements in the surface region was obtained by XPS after successive cycles of argon etching. The results showed that during the treatment at 800°C chromium diffuses to the surface and forms carbides particles that partially cover the surface of the alloy. The uncovered parts of the surface were depleted from chromium and enriched with aluminum and silicon oxides. After exposure at 1100°C a continuous alumina layer was formed and no carbides were detected. The XPS depth profiles showed that the region below the alumina/alloy interface was depleted from chromium and enriched with iron.
| Original language | English |
|---|---|
| Pages (from-to) | 166-174 |
| Number of pages | 9 |
| Journal | Applied Surface Science |
| Volume | 195 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - 15 Jul 2002 |
Bibliographical note
Funding Information:This work was carried out as part of a research project (KACST # no. At-17-333) The authors would like to thank King Abdulaziz City for Sciences and Technology and King Fahd University for Petroleum and Minerals (KFUPM) for their support.
Keywords
- Alloys
- Carburization
- Haynes 214
- Surface segregation
- XPS
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films