EFFECT OF VANADIUM ON HOT CORROSION OF SUPERALLOYS IN MARINE ENVIRONMENT.
Abstract
A screening program was conducted, using a high-pressure burner rig, to evaluate the effect of vanadium on hot corrosion of a turbine-blade alloy in a marine environment. Specimens of Inconel 713C were exposed for periods of up to 55 hours to exhaust gases from Phillips 2-Inch Combustor operated at 2000 F conditions with 0.40 weight per cent sulfur in a JP-5 fuel, 0.063 ppm vanadium in air, and zero and 1.0 ppm sea salt in air. The concentration of 0.063 ppm vanadium in air was equivalent to 3.8 ppm vanadium in fuel. Data from a previous investigation, in the absence of vanadium, were available and were used as the base line for the investigation. Visual appearance, specimen weight-loss and metallographic examination of representative specimens were used in evaluating the effect of vanadium on hot corrosion. Metallographic examination showed evidence of vanadium attack by penetration of the surface layer of depleted alloy; so while weight-loss can be used for evaluating the extent of attack, it may underestimate the vanadium attack. The presence of 0.063 ppm vanadium in air increased weight-loss with both zero and 1.0 ppm sea salt in air, with the attack being more than doubled. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1968
- Accession Number
- AD0665693
Entities
People
- H. T. Quigg
- R. M. Schirmer