STUDY OF THE HOT CORROSION OF SUPERALLOYS

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Abstract:

The effect of operating environment and alloy composition on the nature and extent of oxidation-sulfidation attack was studied with the aid of the Lycoming environmental test rig, which operates at one atmosphere pressure. Sulfidation attack was produced by burning JP-4, JP-4R, and JP-5 fuels sulfur contents of .02, .16, and .16 weight percent respectively while ingesting synthetic sea water at controlled rates to yield saltair ratios of 4ppm and 8ppm. Specimens of 11 nickel base and one cobalt base alloy were subjected to cyclic temperatures, holding at peak temperatures of 1600 F or 1750 F for ten minutes per cycle. The temperature range over which sulfidation occurred and the depth of attack increased with increasing salt-to-air ratios and with time of exposure. Good resistance to attack was generally associated with higher chromium content but high chromium alone did not guarantee good resistance to attack. Microprobe and x-ray investigations indicated that chromium-rich surface oxides provide good resistance to sulfidation and that high aluminum-titanium ratios provide good oxidation resistance.

Author(s):
Walters, J. J.
Author Organization(s):
AVCO LYCOMING DIV STRATFORD CT
Descriptive Note:
Summary rept. 1 Jul 1966-30 Jun 1967
Pagination:
0160

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFML-TR-67-297
Contract/Grant Number(s):
AF 33(615)-5212
Task Number(s):
738107
Project Number(s):
AF-7381
Monitor Series:
TR-67-297, AFML
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_8_Building Partnerships; JCA_5_Command and Control; JCA_5.3_Planning; JCA_8.2_Shape; JCA_3_Force Application; JCA_8.2.4_Leverage Capacities and Capabilities of Security Establishments; JCA_3.2_Engagement; JCA_3.2.1_Kinetic Means; JCA_6.4.1_Secure Information Exchange; JCA_8.1_Communicate; JCA_5.3.2_Apply Situational Understanding; JCA_6_Net Centric; JCA_6.4_Information Assurance; JCA_3.1.3_Maneuver to Influence; JCA_3.1_Maneuver; JCA_8.1.1_Inform Domestic and Foreign Audiences; JCA_8.1.3_Influence Adversary and Competitor Audiences; JCA_8.2.1_Partner with Governments and Institutions
Modernization Areas:
Directed Energy
Communities of Interest:
Air Platforms
Descriptor(s):
*CORROSION, *HEAT RESISTANT ALLOYS, TEMPERATURE, MICROSTRUCTURE, ALUMINUM ALLOYS, X RAY DIFFRACTION, TEST EQUIPMENT, RUPTURE, HEAT TREATMENT, CORROSION RESISTANCE, OXIDATION, OXIDES, CREEP, NICKEL ALLOYS, SULFUR, BAROMETRIC PRESSURE, JET ENGINE FUELS, SEA WATER, TITANIUM ALLOYS, TUNGSTEN ALLOYS, CASTING ALLOYS, COBALT ALLOYS, CHROMIUM ALLOYS, SULFATION
Field(s)/Group(s):
Properties of Metals and Alloys
Keyword(s):
*SUPER ALLOYS, CORROSION, HEAT, JP 4 FUEL, JP 5 FUEL, NICKEL ALLOY INCONEL 713C, NICKEL ALLOY UDIMET 700, SULFIDIZATION, CASTING ALLOYS
Report Date:
1967 Sep 01