Iron aluminide weld overlay coatings for boiler tube protection in coal-fired low NOx boilers [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- pages 279-288 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- Iron aluminide weld overlay coatings are currently being considered for enhanced sulfidation resistance in coal-fired low NOₓ boilers. The use of these materials is currently limited due to hydrogen cracking susceptibility, which generally increases with an increase in aluminum concentration of the deposit. The overall objective of this program is to attain an optimum aluminum content with good weldability and improved sulfidation resistance with respect to conventional materials presently in use. Research has been initiated using Gas Tungsten Arc Welding (GTAW) in order to achieve this end. Under different sets of GTAW parameters (wire feed speed, current), both single and multiple pass overlays were produced. Characterization of all weldments was conducted using light optical microscopy, scanning electron microscopy, and electron probe microanalysis. Resultant deposits exhibited a wide range of aluminum contents (5--43 wt%). It was found that the GTAW overlays with aluminum contents above ∼10 wt% resulted in cracked coatings. Preliminary corrosion experiments of 5 to 10 wt% Al cast alloys in relatively simple H₂/H₂S gas mixtures exhibited corrosion rates lower than 304 stainless steel.
- Published through SciTech Connect.
11. annual conference on fossil energy materials, Knoxville, TN (United States), 20-22 May 1997.
DuPont, J.N.; Banovic, S.W.; Marder, A.R.
- Funding Information:
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