Abstract
The oxidation behavior of specimens containing tungsten inert gas welds of UNS N06025 (NiCrFeA1Y) was investigated in air for up to 5,000h at 900°-1000°C and 1,000h at 1100°-1200°C. In general, the microstructure was very homogeneous in the weld with smaller carbides and the A1 2O 3 internal oxidation penetrations were similar or smaller compared to those formed in the base metal. Oxidation rates are low for N06025 in this temperature range compared to other commercial chromiaforming alloys. As is typical for most alloys above 1000°C, scale spallation becomes more significant and leads to depletion of Al and Cr in the metal substrate beneath the oxide. The depletion was observed to occur to a similar extent in both the weld and base metal for N06025. The maximum internal oxidation depth of the base metal at 9000 and 1 100°C was lower than several other commercial Ni-base alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 74701-747013 |
| Number of pages | 672313 |
| Journal | NACE - International Corrosion Conference Series |
| State | Published - 2007 |
| Event | Corrosion 2007 - Nashville, TN, United States Duration: Mar 11 2007 → Mar 15 2007 |
Keywords
- High temperature oxidation
- Internal oxidation
- NiCrFeAlY alloy
- UNS N06025
- Weld