ASTM F945-06
(Test Method)Standard Test Method for Stress-Corrosion of Titanium Alloys by Aircraft Engine Cleaning Materials
Standard Test Method for Stress-Corrosion of Titanium Alloys by Aircraft Engine Cleaning Materials
SIGNIFICANCE AND USE
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.
SCOPE
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.
1.3 Test conditions are based upon manufacturer's maximum recommended operating solution concentration.
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 and .
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Designation: F945 − 06
StandardTest Method for
Stress-Corrosion of Titanium Alloys by Aircraft Engine
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Cleaning Materials
ThisstandardisissuedunderthefixeddesignationF945;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
INTRODUCTION
Chemical solutions and compounds used for preinspection cleaning or for preservation of titanium
alloy aircraft turbine engine parts shall be subject to qualification requirements of this test method.
1. Scope 2.2 SAE Aerospace Material Specifications:
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AMS 4911 Sheet, Strip and Plate-6AL-4V Annealed
1.1 This test method establishes a test procedure for deter-
AMS 4916 Sheet, Strip, and Plate-8AL 1MO 1V, Duplex
mining the propensity of aircraft turbine engine cleaning and
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Annealed
maintenance materials for causing stress corrosion cracking of
titanium alloy parts.
3. Significance and Use
1.2 The evaluation is conducted on representative titanium
3.1 Because of the tendency of prestressed titanium alloy
alloys by determining the effect of contact with cleaning and
parts to crack if heated while in contact with certain chemical
maintenance materials on tendency of prestressed titanium
reagents, it is necessary to ensure that cleaning and mainte-
alloys to crack when subsequently heated to elevated tempera-
nance materials will not initiate stress corrosion of titanium
tures.
alloys under controlled conditions. For test specimens, two
common titanium alloys are selected, one that is very suscep-
1.3 Test conditions are based upon manufacturer’s maxi-
tible (AMS 4916) and one that is not very susceptible (AMS
mum recommended operating solution concentration.
4911) to stress corrosion cracking.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Measuring Devicecapableoflinearmeasurementwitha
priate safety and health practices and determine the applica-
60.01-in. (60.25-mm) tolerance.
bility of regulatory limitations prior to use. For specific
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precautionary statements, see 5.3 and 5.6. 4.2 Press Forming Apparatus with 0.56-in. (14-mm) diam-
eter mandrel capable of producing approximately 65° bends in
0.050-in. (1.25-mm) titanium alloy sheet specimens.
2. Referenced Documents
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4.3 Beakers or Small Tanks for containment of cleaning,
2.1 ASTM Standards:
rinsing, and test solutions, appropriately lined to prevent
D740 Specification for Methyl Ethyl Ketone
contamination of the solutions by container materials.
D841 Specification for Nitration Grade Toluene
D1193 Specification for Reagent Water
4.4 Vise, capable of precise manipulation at jaw opening of
0.65 in. (16.5 mm). A standard sheet metal worker’s vise with
a 3-in. jaw has been found satisfactory.
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This test method is under the jurisdiction of ASTM Committee F07 on
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 on
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Qualification Testing of Aircraft Cleaning Materials. Available from Society of Automotive Engineers, 400 Commonwealth Dr.,
Current edition approved April 1, 2006. Published April 2006. Originally Warrendale, PA 15096.
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approved in 1985. Last previous edition approved in 2001 as F945 - 01. DOI: The sole source of supply of the apparatus (Alaboratory bench hydraulic press
10.1520/F0945-06. ENER PAC Model No. P-39 has been found satisfactory) known to the committee
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or at this time is Black Hawk Industrial Products, Butler, WI 53007. If you are aware
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Standards volume information, refer to the standard’s Document Summary page on Headquarters.Your comments will receive careful consideration at a meeting of the
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the ASTM website. responsible technical committee, which you may attend.
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F945 − 06
4.5 Air Circulation Furnace capable of operating at 900°F 5.5 Salt Solutions:
(480°C) with control to 620°F (10°C). 5.5.1 100–ppm sodium chloride solution in 2–propanol.
5.5.1.1 Preparationof1000–ppmNaClin2–PropanolStock
4.6 Magnifier capable of 20-diameters magnification.
Solution (Shelf Life Three Months in Flask, see 4.11)—Weigh
4.7 Microscope capable of 500-diameters magnification.
1.000–gNa
...
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