Abstract
Boiler and tubing materials used in biomass-fired energy
production are susceptible to corrosion in severe
corrosive environments caused by inorganic constituents
such as alkali metals and chlorine at the operating
temperatures. Alumina forming alloys have been considered
as possible candidates in these applications. In this
study, overlay welds with FeCrAl type consumables having
a nominal Al content of 5.8% (Kanthal A1) and 10%
(prototype consumable) were developed and produced. The
overlay welds were manufactured on T22 steel
(10CrMo9-10). The overlay welds were made with a
single-wire or two-wire GTAW method. Performance of the
welds was tested in 168 h potassium chloride (KCl)
exposure tests at 600°C in as-welded condition and after
24 h pre-oxidation at 950°C. Aluminium distribution in
the welds and the formed oxide layers in the KCl exposure
were characterized with SEM. After the exposure tests the
oxide scales were mainly iron and chromium oxides in
samples of as-welded condition and aluminium oxide in
samples of preoxidized condition
| Original language | English |
|---|---|
| Number of pages | 7 |
| Publication status | Published - 2012 |
| MoE publication type | Not Eligible |
| Event | 4th International Conference on the Integrity of High Temperature Welds / 9th International Conference on Creep and Fatigue at Elevated Temperatures - London, United Kingdom Duration: 25 Sep 2012 → 27 Sep 2012 |
Conference
| Conference | 4th International Conference on the Integrity of High Temperature Welds / 9th International Conference on Creep and Fatigue at Elevated Temperatures |
|---|---|
| Country | United Kingdom |
| City | London |
| Period | 25/09/12 → 27/09/12 |
Keywords
- Overlay welding
- Fe-Cr-Al-alloys
- oxidation