1、Designation:F51910 Designation: F519 12Standard Test Method forMechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments1This standard is issued under the fixed designation F519; the number immediately following the designation indicates the year of originala
2、doption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.
3、1. Scope1.1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes thatcan cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids,cleaning treatments or maintenance che
4、micals that come in contact with the plated/coated or bare surface of the steel, can also beevaluated.1.2 This test method is not intended to measure the relative susceptibility of different steels. The relative susceptibility ofdifferent materials to hydrogen embrittlement may be determined in acco
5、rdance with Test Method F1459 and Test Method F1624.1.3 This test method specifies the use of air meltedAISI E4340 steel per SAEAMS-S-5000 (formerly MIL-S-5000) heat treatedto 260 280 ksi (pounds per square inch x 1000) as the baseline. This combination of alloy and heat treat level has been used fo
6、rmany years and a large database has been accumulated in the aerospace industry on its specific response to exposure to a widevariety of maintenance chemicals, or electroplated coatings, or both. Components with ultimate strengths higher than 260 280ksi may not be represented by the baseline. In suc
7、h cases, the cognizant engineering authority shall determine the need formanufacturing specimens from the specific material and heat treat condition of the component. Deviations from the baseline shallbe reported as required by section 12.1.2. The sensitivity to hydrogen embrittlement shall be demon
8、strated for each lot ofspecimens as specified in section 9.5.1.4 Test procedures and acceptance requirements are specified for seven specimens of different sizes, geometries, and loadingconfigurations.1.5 Pass/Fail RequirementsFor plating/coating processes, specimens must meet or exceed 200 h using
9、a sustained load test(SLT) at the levels shown in Table 3.1.5.1 The loading conditions and pass/fail requirements for service environments are specified in Annex A5.1.5.2 If approved by the cognizant engineering authority, a quantitative, accelerated (# 24 h) incremental step-load (ISL) testas defin
10、ed in Annex A3 may be used as an alternative to SLT.1.6 This test method is divided into two parts. The first part gives general information concerning requirements for hydrogenembrittlement testing. The second is composed of annexes that give specific requirements for the various loading and specim
11、enconfigurations covered by this test method (see section 9.1 for a list of types) and the details for testing service environments.1.7 The values stated in the foot-pound-second (fps) system in inch-pound units are to be regarded as standard. The values givenin parentheses are mathematical conversi
12、ons to SI units that are provided for information only and are not considered standard.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices
13、and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B374 Terminology Relating to ElectroplatingB851 Specification for Automated Controlled Shot Peening of Metallic Articles Prior to Nickel, Autocatalytic Nickel, orChromium Plating, or as F
14、inal FinishD1193 Specification for Reagent Water1This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.04 on HydrogenEmbrittlement.Current edition approved Dec.June 1, 2010.2012. Published January 2011.Septembe
15、r 2012. Originally approved in 1977. Last previous edition approved in 20082010 asF519 108. DOI: 10.1520/F0519-102.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to
16、the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes
17、 accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unite
18、d States.E4 Practices for Force Verification of Testing MachinesE8 Test Methods for Tension Testing of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE691 Practice for Co
19、nducting an Interlaboratory Study to Determine the Precision of a Test MethodE709 Guide for Magnetic Particle TestingE1417 Practice for Liquid Penetrant TestingE1444 Practice for Magnetic Particle TestingE1823 Terminology Relating to Fatigue and Fracture TestingF1459 Test Method for Determination of
20、 the Susceptibility of Metallic Materials to Hydrogen Gas Embrittlement (HGE)F1624 Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step LoadingTechniqueF2078 Terminology Relating to Hydrogen Embrittlement TestingG5 Reference Test Method for Making Potentio
21、static and Potentiodynamic Anodic Polarization MeasurementsG38 Practice for Making and Using C-Ring Stress-Corrosion Test Specimens2.2 SAE AMS Standard:3AMS 2430 (R) Shot Peening, AutomaticAMS 2759/2 Heat Treatment of Low-Alloy Steel Parts Minimum Tensile Strength 220 ksi (1517 MPa) and HigherAMS 27
22、59/11 Stress Relief of Steel PartsAMS 6360 Steel Tubing, Seamless 0.95Cr 0.20Mo (0.28 0.33C) (SAE 4130) Normalized or Stress RelievedAMS-QQ-P-416 Plating, Cadmium (Electrodeposited)AMS-S-5000 Steel, Chrome-Nickel-Molybdenum (E4340) Bars and Reforging Stock2.3 Military and Federal Standards and Comme
23、rcial Item Descriptions:4MIL-PRF-16173 Corrosion Preventive Compound, Solvent Cutback, Cold-ApplicationCommercial Item Description (CID) A-A-55827 Chromium Trioxide, Technical3. Terminology3.1 DefinitionsDefinitions of terms used in this test method may be found in Terminology B374, Terminology E182
24、3 andTerminology F2078.3.2 Acronyms and Abbreviations :AISI = American Iron and Steel Institutea/W = notch depth-to-width ratiod/D = ratio of minor to major diameters at the notchESH = Environmental, Safety and Healthfps = foot pound secondHRC = Rockwell Hardness Scale CID = inside diameterISL = inc
25、remental step loadkip = pounds load multiplied by 1000ksi = pounds-force per square inch multiplied by 1000Kt= stress concentration factorLS = longitudinal short transverseNFS = notched fracture strengthOD = outside diameterpsi = pounds-force per square inchRMS = root mean squareSAE AMS = Society of
26、 Automotive Engineers Aerospace Material SpecificationSCE = saturated calomel electrodeSLT = sustained load testT.I.R. = total indicated runout4. Summary of Test Methods4.1 Plating/coating ProcessesUnstressed test specimens are cleaned, plated/coated, and baked (if applicable) in accordancewith the
27、specification to which the process is to be qualified. Specimens are then maintained under a sustained load in air tomeasure the time to rupture/completion of the test period.3Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.4Co
28、pies of these documents are available at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700Robins Ave., Building 4D, Philadelphia, PA 19111-5094.F519 1224.2 Service EnvironmentsSpecimens are tested in the service environment. The
29、sequence of exposure to the environment andloading shall be as defined in Annex A5. If plated/coated test specimens are to be utilized for evaluating a service environment,then the plating/coating process must first be determined to be acceptable in accordance with section 4.1.5. Significance and Us
30、e5.1 Plating/coating ProcessesThis test method provides a means by which to detect possible hydrogen embrittlement of steelparts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, andplating/coating. It is also intended to be used
31、 as a qualification test for new plating/coating processes and as a periodic inspectionaudit for the control of a plating/coating process.5.2 Service EnvironmentThis test method provides a means by which to detect possible hydrogen embrittlement of steel parts(plated/coated or bare) due to contact w
32、ith chemicals during manufacturing, overhaul and service life. The details of testing in aservice environment are found in Annex A5.6. Apparatus6.1 Testing MachineTesting machines shall be within the guidelines of calibration, force range, resolution, and verificationof Practices E4.6.2 Gripping Dev
33、icesVarious types of gripping devices may be used in either tension or bending to transmit the load appliedby the testing machine or self-loading frame to the test specimen.6.3 Service Environment TestingFor testing in service environments, an inert container and fixture arrangement that is suitably
34、electrically isolated from the specimen or compensated to prevent galvanic coupling shall be used for testing in aqueousenvironments. The corrosion potential of the specimen may be controlled with a reference Saturated Calomel Electrode (SCE) orequivalent reference electrode such as with Ag/AgCl in
35、accordance with Reference Test Method G5.7. Materials and Reagents7.1 Materials:7.1.1 Air melted AISI E4340 per AMS-S-5000 (formerly MIL-S-5000).7.1.2 Aluminum oxide (150 grit or finer), and 180-grit silicon-carbide paper.7.1.3 Conditioned shot, in accordance with AMS 2430.7.2 Reagents:7.2.1 Corrosi
36、on preventive compound, meeting the requirements of MIL-PRF-16173, Grade 2.7.2.2 Cadmium cyanide electroplating bath (SAE AMS-QQ-P-416, formerly Federal Specification QQ-P-416. (Table 2).7.2.3 Maintenance chemicals, cleaners, paint strippers, and aqueous environments.7.2.4 Chromic acid (CID A-A-5582
37、7, formerly Federal Specification O-C-303D).7.2.5 Water (Specification D1193 Type IV).8. Hazards8.1 Environmental, Safety and Health (ESH):8.1.1 Equipment, materials, solutions, and emissions (if applicable) shall be controlled, handled, used, and disposed inaccordance with the applicable governing
38、ESH regulations.9. Test Specimens9.1 Configuration:9.1.1 Dimensional drawings with tolerances are given for the two types of specimens in the following annexes:9.1.1.1 Type 1Notched SpecimensType 1a: Notched, Round, TensionType 1a.1Standard Sizeper Fig. A1.1 Annex A1Type 1a.2Oversizedper Fig. A1.2 A
39、nnex A1Type 1b: Notched, Round, Tension Self Loading FixtureperFigs. A2.1-A2.5Annex A2Type 1c: Notched, Round, Bend Self Loading FixtureperFig. A2.6, Fig. A2.7Annex A2Type 1d: Notched, C-Ring, Bend Self Loading FixtureperFig. A2.8, Fig. A2.9Annex A2Type 1e: Notched, Square, Bendper Fig. A3.1 Annex A
40、39.1.1.2 Type 2Smooth SpecimensType 2a: O-Ring, Bend Self Loading Fixtureper Fig. A4.1,Fig. A4.2Annex A49.1.2 The notched round tension, round bend and square bend specimens shall be loaded in the longitudinal grain direction, butthe C-Ring and O-Ring can only be loaded normal to the longitudinal gr
41、ain direction.9.2 Manufacture:F519 1239.2.1 Stress concentration factors (Kt) for each of the specimen types were calculated using Finite Element Analysis (FEA) andthe dimensions in the drawings.F519 124NOTE 1An ASTM Research Report documenting the analysis is in process and a reference number will
42、be included in a future revision.Type KtMinimumANominal MaximumA1a.1 3.16 3.30 3.481a.2 3.31 3.59 3.761b 2.86 3.07 3.331c 3.30 3.45 3.621d 3.73 4.03 4.421e 3.95 4.27 4.602a NA NA NAAMinimum and maximum Kts calculated from worst case combinations of dimensional tolerances.9.2.2 If the 60 notch angle
43、does not permit plating/coating to the root of the notch, then an angle of 90 6 1 shall be usedonly with prior approval of the cognizant engineering authority.NOTE 2The FEA determined that changing the notch angle from 60 to 90 had a negligible affect on the Kt. Therefore, no dimensional changes are
44、required to compensate for this deviation. However, such deviation shall be reported as required in 12.1.2.9.2.3 The baseline material/condition for test specimens is normalized and tempered, hot or cold drawn bar stock, air meltedAISI E4340 steel per AMS-S-5000 (formerly MIL-S-5000) heat treated pe
45、r AMS 2759/2 Class A to a tensile strength between 260and 280 ksi (51 to 53 Rockwell C Hardness Scale (HRC) as determined according to Test Methods E18. Rounding per PracticeE29 permits an absolute hardness range of 50.6 to 53.4 HRC of the average of three measurements.9.2.3.1 Other steels or final
46、hardnesses may only be substituted if agreed upon by the cognizant engineering authority.Deviations from the baseline shall be reported as required in 12.1.2.9.2.4 Rough machine blanks as required.9.2.5 Heat treat as a finished part to a strength level of 260 to 280 ksi per AMS 2759/2 Class A as fol
47、lows:9.2.5.1 Austenitize at 1500 1550F in a protective atmosphere and then quench in oil.9.2.5.2 Double temper, 2 h each, at 425 490F.9.2.6 Verify heat treat response by pulling 4 specimens in accordance with Test Method E8 and Table 1.9.2.7 Finish machine the reduced section and notch configuration
48、.9.2.7.1 The entire notch shall be ground to size.9.2.7.2 Single-point machining of the notch is not permitted.9.2.7.3 Burnishing of the notch is not permitted.9.2.7.4 Shot peening/blasting/mechanical cleaning of the notch during specimen manufacturing is not permitted.9.2.8 After grinding, all spec
49、imens shall receive a stress relief bake at 375 6 25F (190 6 14C) per AMS 2759/11 for 45 h.A suitable protection from discoloration due to surface oxidization shall be used.9.2.9 Acid or cathodic electrolytic cleaning is prohibited.9.2.10 Straightening after final heat treatment is prohibited.9.3 Storage:9.3.1 After stress relief baking, all specimens shall be protected during storage to prevent corrosion. A suitable means ofprotection is to coat the specimen with a corrosion preventive compound meeting the requirements of MIL-PRF
