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Significance and Use
3.1 Because of the tendency of prestressed titanium alloy parts to crack if heated while in contact with certain chemical reagents, it is necessary to ensure that cleaning and maintenance materials will not initiate stress corrosion of titanium alloys under controlled conditions. For test specimens, two common titanium alloys are selected, one that is very susceptible (AMS 4916) and one that is not very susceptible (AMS 4911) to stress corrosion cracking.
1.1 This test method establishes a test procedure for determining the propensity of aircraft turbine engine cleaning and maintenance materials for causing stress corrosion cracking of titanium alloy parts.
1.2 The evaluation is conducted on representative titanium alloys by determining the effect of contact with cleaning and maintenance materials on tendency of prestressed titanium alloys to crack when subsequently heated to elevated temperatures.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 5.3 and 5.6.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D740 Specification for Methyl Ethyl Ketone
D841 Specification for Nitration Grade Toluene
D1193 Specification for Reagent Water
SAE Aerospace Material SpecificationsAMS 4916 Sheet, Strip, and Plate-8AL 1MO 1V, Duplex Annealed
ICS Number Code 49.025.30 (Titanium)
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ASTM F945-12, Standard Test Method for Stress-Corrosion of Titanium Alloys by Aircraft Engine Cleaning Materials, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top