ASTM F945-98

Standard Test Method for Stress-Corrosion of Titanium Alloys by Aircraft Engine Cleaning Materials

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.  
1.4 This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult and 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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2001
• ICS: 49.025.30 - Titanium
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.07 - Qualification Testing of Aircraft Cleaning Materials

Relations

• Replaced By: ASTM F945-01 - Standard Test Method for Stress-Corrosion of Titanium Alloys by Aircraft Engine Cleaning Materials
• Effective Date: 10-Nov-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: F 945 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Stress-Corrosion of Titanium Alloys by Aircraft Engine
1
Cleaning Materials
This standard is issued under the fixed designation F 945; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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 parts to crack if heated while in contact with certain chemical
reagents, it is necessary to ensure that cleaning and mainte-
1.1 This test method establishes a test procedure for deter-
nance materials will not initiate stress corrosion of titanium
mining the propensity of aircraft turbine engine cleaning and
alloys under controlled conditions.
maintenance materials for causing stress corrosion cracking of
titanium alloy parts.
4. Apparatus
1.2 The evaluation is conducted on representative titanium
4.1 Measuring Device capable of linear measurement with
alloys by determining the effect of contact with cleaning and
a 60.01-in. (60.25-mm) tolerance.
maintenance materials on tendency of prestressed titanium
5
4.2 Press Forming Apparatus with 0.56-in. (14-mm) di-
alloys to crack when subsequently heated to elevated tempera-
ameter mandrel capable of producing approximately 65° bends
tures.
in 0.050-in. (1.25-mm) titanium alloy sheet specimens.
1.3 Test conditions are based upon manufacturer’s maxi-
4.3 Beakers or Small Tanks for containment of cleaning,
mum recommended operating solution concentration.
rinsing, and test solutions, appropriately lined to prevent
1.4 This standard does not purport to address all of the
contamination of the solutions by container materials.
safety concerns, if any, associated with its use. It is the
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4.4 Vise, capable of precise manipulation at jaw opening of
responsibility of the user of this standard to establish appro-
0.65 in. (16.5 mm).
priate safety and health practices and determine the applica-
7
4.5 Air Circulation Furnace capable of operating at 900°F
bility of regulatory limitations prior to use. For specific
(480°C) with control to 620°F (10°C).
precautionary statements, see 5.3 and 5.5.
8
4.6 Magnifier capable of 20-diameters magnification.
9
2. Referenced Documents 4.7 Microscope capable of 500-diameters magnification.
4.8 Bolt, stainless steel, 0.25-in. (6-mm) diameter with
2.1 ASTM Standards:
2 stainless steel washers and nut.
D 740 Specification for Methyl Ethyl Ketone
2
4.9 Test Specimens, AMS 4911 and AMS 4916 Titanium
D 841 Specification for Nitration Grade Toluene
3 Alloys—with specimens prepared from the same sheet stock
D 1193 Specification for Reagent Water
for each alloy and cut parallel to the rolling direction to the
2.2 SAE Aerospace Material Specifications:
4
dimensions of Fig. 1. The specimen edges shall not be deburred
AMS 4911 Sheet, Strip and Plate-6AL-4V Annealed
or otherwise relieved before testing.
AMS 4916 Sheet, Strip, and Plate-8AL 1MO 1V, Duplex
4
4.10 Cotton Gloves, white.
Annealed
5. Reagents and Materials
3. Significance and Use
5.1 Purity of Reagent—Reagent grade chemicals shall be
3.1 Because of the tendency of prestressed titanium alloy
1 5
This test method is under the jurisdiction of ASTM Committee F-7 on A laboratory bench hydraulic press ENER PAC Model No. P-39 manufactured
by Black Hawk Industrial Products, Butler, WI, has been found satisfactory.
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 on
6
Qualification Testing of Aircraft Cleaning Materials. A standard sheet metal worker’s vise with a 3-in. jaw has been found
Current edition approved Oct. 10, 1998. Published March 1999. Originally satisfactory.
7
published as F 945 - 85. Last previous edition F 945 - 85 (Reapproved 1993). A Blue M Electric Co. POM-6680F-1 furnace has been found satisfactory.
2 8
Annual Book of ASTM Standards, Vol 06.04. A Bausch and Lomb Stereo Zoom 4 Model KVB-73 has been found
3
Annual Book of ASTM Standards, Vol 11.01. satisfactory.
4 9
Available from Society of Automotive Engineers, 400 Commonwealth Dr., A Bausch and Lomb Micro Zoom Catalog No. 31-19-30-02 has been found
Warrendale, PA 15096. satisfactory.
1

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F 945
FIG. 1 U-Bend Specimen Dimensions
used in all cases. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications
...