Effects of Mo and Al on hot corrosion (sulfidation) behavior of experimental Ni base superalloys

Journal Article · Fri Mar 01 04:00:00 EDT 1974 · Met. Trans., v. 5, no. 3, pp. 673-683

OSTI ID:4309304

Morrow, H III; Sponseller, D L; Kalns, E

The hot corrosion behavior of a series of wrought nickel-base superalloys containing approximately 13 wt% Cr was studied as a function of molybdenum content from 0 to 8 wt% Mo in each of four Al + Ti levels (3% Al, 4 1/ 2% Al, 6% Al, and 1% Al-3 1/2% Ti). Specimens were tested in a burner rig with a 5 ppM sea salt concentration in a 1% sulfur diesel fuel burned at a 30: 1 air-to- fuel ratio and were cycled between 1600 or 1800 deg F and room temperature every 50 h during a 1000-h test. It was found that molybdenum significantly reduced the amount of hot corrosion attack at 1800 deg F for the three aluminum- containing series of alloys. For the titantium-containing series of alloys tested at 1800 deg F and all alloys exposed at 1800 deg F, molybdenum exerted little influence on hot corrosion behavior. Aluminum was found to markedly increase sulfidation rates at both 1600 and 1800 deg F for all molybdenum levels. Titanium appeared to be beneficial to the hot corrosion resistance of these alloys at 1600 deg F and detrimental at 1800 deg F. It was further noted that 1800 deg F represented a more severe sulfidation condition than 1800 deg F under these test conditions. (auth)

• Research Organization: Climax Molybdenum Co. of Michigan, Ann Arbor
• NSA Number: NSA-29-024650
• OSTI ID: 4309304
• Journal Information: Met. Trans., v. 5, no. 3, pp. 673-683, Journal Name: Met. Trans., v. 5, no. 3, pp. 673-683; ISSN MTGTB
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*ALUMINIUM ALLOYS-- CORROSION
*MOLYBDENUM ALLOYS-- CORROSION
*NICKEL BASE ALLOYS-- CORROSION
*SULFUR-- CORROSIVE EFFECTS
*TITANIUM ALLOYS-- CORROSION
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COMBUSTION
KEROSENE
N50210* --Metals
Ceramics
& Other Materials--Metals & Alloys--Corrosion & Erosion & Surface Phenomena
SODIUM CHLORIDES
SULFIDES
TIME DEPENDENCE
VERY HIGH TEMPERATURE CORROSIVE EFFECTS