ASTM_F_945_-_12.pdf

Designation:F94512Standard Test Method forStress-Corrosion of Titanium Alloys by Aircraft EngineCleaning Materials1This standard is issued under the fixed designation F945;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONChemical solutions and compounds used for preinspection cleaning or for preservation of titaniumalloy aircraft turbine engine parts shall be subject to qualification requirements of this test method.1.Scope1.1 This test method establishes a test procedure for deter-mining the propensity of aircraft turbine engine cleaning andmaintenance materials for causing stress corrosion cracking oftitanium alloy parts.1.2 The evaluation is conducted on representative titaniumalloys by determining the effect of contact with cleaning andmaintenance materials on tendency of prestressed titaniumalloys to crack when subsequently heated to elevated tempera-tures.1.3 Test conditions are based upon manufacturers maxi-mum recommended operating solution concentration.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificprecautionary statements,see 5.3 and 5.6.2.Referenced Documents2.1 ASTM Standards:2D740 Specification for Methyl Ethyl KetoneD841 Specification for Nitration Grade TolueneD1193 Specification for Reagent Water2.2 SAE Aerospace Material Specifications:AMS 4911 Sheet,Strip and Plate-6AL-4V Annealed3AMS 4916 Sheet,Strip,and Plate-8AL 1MO 1V,DuplexAnnealed33.Significance and Use3.1 Because of the tendency of prestressed titanium alloyparts to crack if heated while in contact with certain chemicalreagents,it is necessary to ensure that cleaning and mainte-nance materials will not initiate stress corrosion of titaniumalloys under controlled conditions.For test specimens,twocommon titanium alloys are selected,one that is very suscep-tible(AMS 4916)and one that is not very susceptible(AMS4911)to stress corrosion cracking.4.Apparatus4.1 Measuring Device capable of linear measurement with a60.01-in.(60.25-mm)tolerance.4.2 Press Forming Apparatus4with 0.56-in.(14-mm)diam-eter mandrel capable of producing approximately 65 bends in0.050-in.(1.25-mm)titanium alloy sheet specimens.4.3 Beakers or Small Tanks for containment of cleaning,rinsing,and test solutions,appropriately lined to preventcontamination of the solutions by container materials.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 onQualification Testing of Aircraft Cleaning Materials.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1985.Last previous edition approved in 2006 as F945 06.DOI:10.1520/F0945-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers,400 Commonwealth Dr.,Warrendale,PA 15096.4The sole source of supply of the apparatus(A laboratory bench hydraulic pressENER PAC Model No.P-39 has been found satisfactory)known to the committeeat this time is Black Hawk Industrial Products,Butler,WI 53007.If you are awareof alternative suppliers,please provide this information to ASTM InternationalHeadquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Vise,capable of precise manipulation at jaw opening of0.65 in.(16.5 mm).A standard sheet metal workers vise witha 3-in.jaw has been found satisfactory.4.5 Air Circulation Furnace capable of operating at 900F(480C)with control to 620F(10C).4.6 Magnifier capable of 20-diameters magnification.4.7 Microscope capable of 500-diameters magnification.4.8 Bolt,stainless steel,0.25-in.(6-mm)diameter withstainless steel washers and nut.4.9 Test Specimens,AMS 4911 and AMS 4916 TitaniumAlloyswith specimens prepared from the same sheet stock foreach alloy and cut parallel to the rolling direction to thedimensions of Fig.1.The specimen edges shall not be deburredor otherwise relieved before test