（高清版） ASTM F519-17a ASTM 标准下载

ThisinternationalstandardwasdevelopedinaccordancewithinternationallyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesforthe

DevelopmentofInternationalStandards,GuidesandRecommendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.

Designation:F519-17a

StandardTestMethodfor

MechanicalHydrogenEmbrittlementEvaluationofPlating/CoatingProcessesandServiceEnvironments¹

ThisstandardisissuedunderthefixeddesignationF519;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.

ThisstandandhasbeenapprovedforusebyagenciesoftheU.S.DepartnentofDefense.

1.Scope

1.1Thistestmethoddescribesmechanicaltestmethodsanddefinesacceptancecriteriaforcoatingandplatingprocessesthatcancausehydrogenembrittlementinsteels.Subsequentexposuretochemicalsencounteredinserviceenvironments,suchasfluids,cleaningtreatmentsormaintenancechemicalsthatcomeincontactwiththeplated/coatedorbaresurfaceofthesteel,canalsobeevaluated.

1.2Thistestmethodisnotintendedtomeasuretherelativesusceptibilityofdifferentsteels.Therelativesusceptibilityofdifferentmaterialstohydrogenembrittlementmaybedeter-minedinaccordancewithTestMethodF1459andTestMethod

F1624.

1.3ThistestmethodspecifiestheuseofairmeltedSAE

4340steel(GradeA,see7.1.1)perSAEAMS6415(formerlySAEAMS-S-5000andformerlyMIL-S-5000)oranalternativeVAR(VacuumArcRemelt)SAE4340steel(GradeB,see

7.1.1)perSAEAMS6414,andbothareheattreatedto260to

280ksi(poundspersquareinchx1000)asthebaseline.Thiscombinationofalloyandheattreatlevelhasbeenusedformanyyearsandalargedatabasehasbeenaccumulatedintheaerospaceindustryonitsspecificresponsetoexposuretoawidevarietyofmaintenancechemicals,orelectroplatedcoatings,orboth.Componentswithultimatestrengthshigherthan260to280ksimaynotberepresentedbythebaseline.Insuchcases,thecognizantengineeringauthorityshalldeterminetheneedformanufacturingspecimensfromthespecificmate-rialandheattreatconditionofthecomponent.Deviationsfromthebaselineshallbereportedasrequiredby12.1.2.Thesensitivitytohydrogenembrittlementshallbedemonstratedforeachlotofspecimensasspecifiedin9.5.

NonE1—ExtensivetestinghasshownthatVAR4340steelmaybeused

asanalternativetotheairmeltedsteelwithnolossinsensitivity.²

Nore2—VAR4340alsomeetstherequirementsinAMS6415andcouldbeusedasanalternativetoairmeltsteelbythesteelsuppliersbecauseAMS6415doesnotspecifyameltingpractice.

1.4Testproceduresandacceptancerequirementsarespeci-fiedforsevenspecimensofdifferentsizes,geometries,andloadingconfigurations.

1.5Pass/FailRequirements—Forplating/coatingprocesses,specimensmustmeetorexceed200husingasustainedloadtest(SLT)atthelevelsshowninTable3.

1.5.1Theloadingconditionsandpass/failrequirementsforserviceenvironmentsarespecifiedinAnnexA5.

1.5.2Ifapprovedbythecognizantengineeringauthority,aquantitative,accelerated(≤24h)incrementalstep-load(ISL)testasdefinedinAnnexA3maybeusedasanalternativetoSLT.

1.6Thistestmethodisdividedintotwoparts.Thefirstpartgivesgeneralinformationconcerningrequirementsforhydro-genembrittlementtesting.Thesecondiscomposedofannexesthatgivespecificrequirementsforthevariousloadingandspecimenconfigurationscoveredbythistestmethod(seesection9.1foralistoftypes)andthedetailsfortestingserviceenvironments.

1.7Thevaluesstatedinthefoot-pound-second(fps)systemininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.

1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.

ThistestmethodisunderthejurisdictionofASTMCommitteeF07onAerospaceandAircraftandisthedirectresponsibilityofSubcommitteeF07.04onHydrogenEmbrittlement.

CurrenteditionapprovedDec.1,2017.PublishedDecember2017.Originallyapprovedin1977.Lastpreviouseditionapprovedin2017asF519-17.DOI:10.1520/F0519-17A.

2"FinalReport-DesignofExperimentApproachtoHydrogenRe-EmbrittlementEvaluationWP-2152";S.MGrendahl,H.Nguyen,F.Kellogg,S.Zhu,S.Jones;StrategicEnvironmentalResearchandDevelopmentProgram(SERDP);ProjectWP-2152;July2015;/Program-

Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-

StructuralMaterials/WP-2152.

CopyrightOASTMIntemational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates

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F519-17a

TABLE1LotAcceptanceCriteriaforNotchedSpecimens

TypeItem

SamplingofEachLot

Requirement/Method

TestMethodE8.Tensile

1TensileStrength4each

strengthofeachspecimen

mustbewithin10ksiofthe

average

1Hardness^5%51to53HRCperTest

MethodsE18.

Roundtheaverageof

threereadingsper

specimenperPractice

E29

1Dimensions100%Meettolerancesof

corresponding

drawings.Notch

dimensionverifiedwith

shadowgraphic

projectionat50to

100xorequivalent

1NotchedFracture10eaTestMethodsE8/EBM.NFSof

Strength(NFS)eachspecimen

mustbewithin10ksi

oftheaverage.

1cSel-loading10eaAlternate:Thenumberof

notchedroundturnsoftheloading

specimenbendbolt,whichisrequired

fixture,Fig.A2.7toproducefracturein

eachspecimen,mustbe

within5%ofthe

average

1dSelf-loading10eaAltermate:Thechangein

notchedC-Ringdiameteratfracture

bendfixture,loadforeachspecimen

Fig.A2.8mustbewithin0.008

inchesoftheaverage

AIfthehardnessrequirementsofanyofthesampledspecimensarenotsatisfied,onlythosespecimensofthelotthatareindividuallyinspectedforconformancetotheserequirementsshallbeusedfortesting.

1.9Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.

2.ReferencedDocuments

2.1ASTMStandards:3

B374TerminologyRelatingtoElectroplating

B851SpecificationforAutomatedControlledShotPeeningofMetallicArticlesPriortoNickel,AutocatalyticNickel,orChromiumPlating,orasFinalFinish

D1193SpecificationforReagentWater

E4PracticesforForceVerificationofTestingMachines

E8/E8MTestMethodsforTensionTestingofMetallicMa-terials

E18TestMethodsforRockwellHardnessofMetallicMa-terials

E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications

3ForreferencedASTMstandards,visittheASTMwebsite,,orcontactASTMCustomerServiceatservice@.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard'sDocumentSummarypageontheASTMwebsite.

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E292TestMethodsforConductingTime-for-RuptureNotchTensionTestsofMaterials

E691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod

E709GuideforMagneticParticleTesting

E1417PracticeforLiquidPenetrantTesting

E1444PracticeforMagneticParticleTesting

E1823TerminologyRelatingtoFatigueandFractureTesting

F1459TestMethodforDeterminationoftheSusceptibilityofMetallicMaterialstoHydrogenGasEmbrittlement(HGE)

F1624TestMethodforMeasurementofHydrogenEm-brittlementThresholdinSteelbytheIncrementalStepLoadingTechnique

F2078TerminologyRelatingtoHydrogenEmbrittlementTesting

G5ReferenceTestMethodforMakingPotentiodynamicAnodicPolarizationMeasurements

G38PracticeforMakingandUsingC-RingStress-CorrosionTestSpecimens

2.2SAEAMSStandard:4

AMS2430(R)ShotPeening,Automatic

AMS2759/2HeatTreatmentofLow-AlloySteelPartsMinimumTensileStrength220ksi(1517MPa)andHigher

AMS2759/11StressReliefofSteelParts

AMS6360SteelTubing,Seamless0.95Cr-0.20Mo(0.28-0.33C)(SAE4130)NormalizedorStressRelieved

AMS6414Steel,Bars,Forgings,andTubing(SAE4340)

VacuumConsumableElectrodeRemelted

AMS6415Steel,Bars,Forgings,andTubing(SAE4340)AMS-QQ-P-416Plating,Cadmium(Electrodeposited)

2.3MilitaryandFederalStandardsandCommercialItemDescriptions:5

MIL-PRF-16173CorrosionPreventiveCompound,SolventCutback,Cold-Application

CommercialItemDescription(CID)A-A-55827ChromiumTrioxide,Technical

3.Terminology

3.1Definitions—DefinitionsoftermsusedinthistestmethodmaybefoundinTerminologyB374,TerminologyE1823andTerminologyF2078.

3.2AcronymsandAbbreviations:

AISI=AmericanIronandSteelInstitute

a/W=notchdepth-to-widthratio

d/D=ratioofminortomajordiametersatthenotch

ESH=Environmental,SafetyandHealth

fps=footpoundsecond

HRC=RockwellHardnessScaleC

ID=insidediameter

ISL=incrementalstepload

AvailablefromSocietyofAutomotiveEngincers(SAE),400CommonwealthDr.Warrendale,PA15096-0001,.

5Copiesofthesedocumentsareavailableat/quicksearch/ororfromtheStandardizationDocumentOrderDesk,700RobinsAve.,Building4D,Philadelphia,PA19111-5094.

2

TABLE2ElectroplatingBathCompositionsandOperatingConditionsforSensitivityTest

Item

Treatment

A

TreatmentB

Bathcomposition:

Cadmium(asCdO)

TotalSodiumcyanide

(NaCN)

RatioNaCNtoCdo

pH

Temperature

Sodiumhydroxide

(NaOH)A

Brightenersuchas

Colcad100°or

equivalent

ElectroplatingElectroplating

currenttime

Baking

Bakingtemperature

Bakingtime:Type1

Specimen

Bakingtime:Type2a

Specimen

ChromateTreatmentc

Range

2.9to5.5oz/gal(22to

41g/L)

12.0to16.0oz/gal(89.9

to120g/L)

2.8/1to6.0/1

12.0orgreater

70-90°F(21-32℃)

1.0to3.2oz/gal(7.5to

24.0g/L)

Manufacturer's

Optimum

4.5oz/gal(33.7g/L)

14oz/gal(104g/L)

3.0/1

12.0

75°F(24℃)

2.5oz/gal(18.7g/L)

suggestedrange

10A/²(108A/m²)

30minutes

375±25°F(190±14℃)

DoNotBake

8h

Yes

sameasTreatment

sameasTreatment

sameasTreatment

sameasTreatment

sameasTreatment

sameasTreatment

None

60A/t²(645A/m²)

6minutes

sameasTreatment

23h

23h

sameasTreatment

A

A

A

A

A

A

A

A

AAdditionofsodiumhydroxidemaynotberequiredonsolutionmakeup,sincetheadditionof1oz/galofcadmiumoxideisequivalentto0.6oz/galoffreehydroxide.PThesolesourceofmanufactureofColcad100knowntothecommitteeatthistimeisColumbiaChemicalinBrunswick,Ohio,.Ifyouareawareofaltemativemanufacturers,pleaseprovidethisinformationtoASTMIntemationalHeadquarters.Yourcommentswilreceivecarefulconsiderationatameeting

oftheresponsibletechnicalcommittee,whichyoumayattend.

CAfterbaking,thespecimensshallbedippedintoanyappropriatechromateconversioncoatingsolutionforminimumtimethatwillproduceanadherentandcontinuouscoatingasdescribedinAMS-QQ-P-416TypeII.

TABLE3Pass/FailLoadingRequirementsofTestSpecimens

Typela,1b,1c,1d,1e75%ofthetensileorbendNFS(Table1).

Type2a92%oftheTestMethodsE8/E8M,E4ultimate

strength,obtainedbydefiectinga2.300-inchdiameter O-Ringspecimenwitha2.525-inchstressingbar.

kip=poundsloadmultipliedby1000

ksi=pounds-forcepersquareinchmultipliedby1000

K,=stressconcentrationfactor

LS=longitudinalshorttransverse

NFS=notchedfracturestrength

OD=outsidediameter

psi=pounds-forcepersquareinch

RMS=rootmeansquare

SAEAMS=SocietyofAutomotiveEngineersAerospaceMaterialSpecification

SCE=saturatedcalomelelectrode

SLT=sustainedloadtest

T.I.R.=totalindicatedrunout

4.SummaryofTestMethods

4.1Plating/coatingProcesses—Unstressedtestspecimensarecleaned,plated/coated,andbaked(ifapplicable)inaccor-dancewiththespecificationtowhichtheprocessistobequalified.Specimensarethenmaintainedunderasustainedloadinairtomeasurethetimetorupture/completionofthetestperiod.

4.2ServiceEnvironments—Specimensaretestedintheserviceenvironment.Thesequenceofexposuretotheenviron-mentandloadingshallbeasdefinedinAnnexA5.Ifplated/coatedtestspecimensaretobeutilizedforevaluatingaserviceenvironment,thentheplating/coatingprocessmustfirstbedeterminedtobeacceptableinaccordancewith4.1.

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5.SignificanceandUse

5.1Plating/coatingProcesses—Thistestmethodprovidesameansbywhichtodetectpossiblehydrogenembrittlementofsteelpartsduringmanufacturebyverifyingstrictcontrolsduringproductionoperationssuchassurfacepreparation,pretreatments,andplating/coating.Itisalsointendedtobeusedasaqualificationtestfornewplating/coatingprocessesandasaperiodicinspectionauditforthecontrolofaplating/coatingprocess.

5.2ServiceEnvironment-Thistestmethodprovidesameansbywhichtodetectpossiblehydrogenembrittlementofsteelparts(plated/coatedorbare)duetocontactwithchemicalsduringmanufacturing,overhaulandservicelife.ThedetailsoftestinginaserviceenvironmentarefoundinAnnexA5.

6.Apparatus

6.1TestingMachine—Testingmachinesshallbewithintheguidelinesofcalibration,forcerange,resolution,bendingstrain,andverificationofPracticesE4andTestMethodsE292asapplicable.

6.1.1Theforcemeasurementontestmachinesusedfornotchedroundtensionspecimens,shallbeviaanalyticalcalculationssuchasfordeadweightorleverarmtypehangingweightmachines,orbyroutineempiricalmeasurement(elec-tronicoutput)suchasforstraingaugeloadcells.Estimatingtestloadsthatarederivedfromloadringdeflectionsonlyisnotallowed,unlesstheeffectsofspecimengripjointcomplianceisknown,isaccountedfor,andwithinPracticeE4andTestMethodE8/E8Mtolerances.Straingaugeloadcell

measurements/resultscanbeusedinconjunctionwithloadringdeflections.

3

F519-17a

6.2GrippingDevices—Varioustypesofgrippingdevicesmaybeusedineithertensionorbendingtotransmittheloadappliedbythetestingmachineorself-loadingframetothetestspecimen.

6.3SeriesLoading—Samplesmaybeloadedonatestframeeitherindividuallyorbymultiplesinseries.AllspecimensloadedontoanindividualtestframeshallhavethesamecertifiedNFS±1%.Intheeventthatoneormoreofthespecimensfractureduringthedesignatedtestperiod,thefracturedspecimen(s)shallberemoved,replacedwithadummyspecimenandtheloadchainplacedbackunderload.Thetotaltimeunderload(thatis,testduration)fortheremainingspecimensshallbeextendedbyanytime-off-loadasdetailedin6.3.1.Theprocuringspecificationorcognizantengineeringauthoritymayelecttorestrictloadingtoonespecimenpertestframe.

6.3.1ExtendedTimeUnderLoad(ETUL)-Ifthetotaltime-off-load(wallclock)exceeds10%ofthetotaltestduration(forexample.20-hfora200-htest);thenthetimeunderloadshallbeextendedbytheamountoftime-off-loadinexcessof10%(thatis,inexcessof20h).Theprocuringspecificationorcognizantengineeringauthoritymayelecttowaivethisextendedtimeunderload(ETUL)protocol.

EXAMPLE1forSLT

Fourcadmium-platedspecimensrepresentingasingleplatingbathareloadedonanindividualSLTtestframeaspartofamonthlyplatingbathverification.

Oneofthefourspecimensfracturesafter180h(initialtimeunderload=180h).Ittakes8htodiscoverthefracturedspecimen,replaceitwithadummylink,andputtheremainingthreespecimensbackunderload(timeoff-load=8h).Noextensionoftimeunderloadisrequiredsincethetimeoff-load(8h)was

lessthan10%ofthetotaltestduration(10%of200h=20h).Totaltimeunderloadwilthereforebe200hfortheremainingspecimens.

EXAMPLE2forSLT

Twentycadmium-platedspecimensrepresentingfivedistinctplatingbaths(A,B,C,D,andE)areloadedonanindividualSLTtestframeaspartofamonthly

platingbathverification.OnespecimenfrombathAfracturesafter100h;onespecimenfrombathBfracturesafter120h;andonespecimenfrombathC

fracturesafter140h.Eachtimeaspecimenfractures,ittakes8htodiscoverthefracturedspecimen,replaceitwithadummylink,andputtheremaining

specimensbackunderload(totaltimeof-load=8+8+8h=24h).Thetotal

timeoff-load(24h)exceeds10%ofthetotaltestduration(10%of200=20h)

by4h.Therefore,thetimeunderloadmustbeextendedby4h.Totaltimeunderloadwillthereforebe204hfortheremainingspecimens.

6.4ServiceEnvironmentTesting—Fortestinginserviceenvironments,aninertcontainerandfixturearrangementthatissuitablyelectricallyisolatedfromthespecimenorcompen-satedtopreventgalvaniccouplingshallbeusedfortestinginaqueousenvironments.ThecorrosionpotentialofthespecimenmaybecontrolledwithareferenceSaturatedCalomelElec-trode(SCE)orequivalentreferenceelectrodesuchaswithAg/AgClinaccordancewithReferenceTestMethodG5.

7.MaterialsandReagents

7.1Materials:

7.1.1Steelshallbe:

GradeA-AirmeltedSAE4340steelperSAEAMS

6415(formerlySAEAMS-S-5000andformerlyMIL-S-5000)

or

GradeB-VAR(VacuumArcRemelt)SAE4340steelperSAEAMS6414.

IfnoGradeisspecified,GradeAshallbeused.

7.1.2Aluminumoxide(150gritorfiner),and180-gritsilicon-carbidepaper.

7.1.3Conditionedshot,inaccordancewithAMS2430.

7.2Reagents.

7.2.1Corrosionpreventivecompound,meetingtherequire-mentsofMIL-PRF-16173,Grade2.

7.2.2Cadmiumcyanideelectroplatingbath(SAEAMS-QQ-P-416,formerlyFederalSpecificationQQ-P-416.(Table

2).

7.2.3Maintenancechemicals,cleaners,paintstrippers,andaqueousenvironments.

7.2.4Chromicacid(CIDA-A-55827,formerlyFederalSpecificationO-C-303D).

7.2.5Water(SpecificationD1193TypeIV).

8.Hazards

8.1Environmental,SafetyandHealth(ESH):

8.1.1Equipment,materials,solutions,andemissions(if

applicable)shallbecontrolled,handled,used,anddisposedinaccordancewiththeapplicablegoverningESHregulations.

9.TestSpecimens

9.1Configuration:

9.1.1Dimensionaldrawingswithtolerancesaregivenforthetwotypesofspecimensinthefollowingannexes:

Type1—NotchedSpecimens

Type1a:Notched,Round,Tension

AnnexA1AnnexA1AnnexA2

Type1a.1—StandardSize—perFig.A1.1

Type1a.2—Oversized—perFig.Ai.2

Type1b:Notched,Round,TensionSelfLoadingFixture—

per

Figs.A2.1-A2.5

AnnexA2

AnnexA2

A3

Type1c:Notched,Round,BendSelfLoadingFixture—per

Fig.A2.6,Fig.A2.7

Type1d:Notched,C-Ring,BendSelfLoadingFixture—per

Fig.A2.8,Fig.A2.9

.

Fig.Type1e:Notched,Square,Bend—perFig.1A3Annex

Type2—SmoothSpecimens

Annex

A4

Type2a:O-Ring,BendSelfLoadingFixture—perFig.A4.1,

Fig.A4.2

9.1.2Thenotchedroundtension,roundbendandsquarebendspecimensshallbeloadedinthelongitudinalgraindirection,buttheC-RingandO-Ringcanonlybeloadednormaltothelongitudinalgraindirection.

9.2Manufacture:

9.2.1Stressconcentrationfactors(K,)foreachofthe

specimentypeswerecalculatedusingFiniteElementAnalysis(FEA)andthedimensionsinthedrawings.

NorE3—AnASTMResearchReportdocumentingtheanalysisisinprocessandareferencenumberwillbeincludedinafuturerevision.

K

.

Type

1a.1

1a.2

1b

1c

1d

1e

2a

Minimum

3.16

3.31

2.86

3.30

3.73

3.95

NA

Nominal

3.30

3.59

3.07

3.45

4.03

4.27

NA

Maximum3.483.763.333.624.424.60NA

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F519-17a

AMinimumandmaximumK,scalculatedfromworstcasecombinationsofdimen-sionaltolerances.

9.2.2Ifthe60°notchangledoesnotpermitplating/coatingtotherootofthenotch,thenanangleof90°±1°shallbeusedonlywithpriorapprovalofthecognizantengineeringauthor-ity.

NorE4—TheFEAdeterminedthatchangingthenotchanglefrom60°to90°hadanegligibleaffectontheK,.Therefore,nodimensionalchangesarerequiredtocompensateforthisdeviation.However,suchdeviationshallbereportedasrequiredin12.1.2.

9.2.3Thebaselinematerial/conditionfortestspecimensisnormalizedandtempered,hotorcolddrawnbarstock,airmeltedSAE4340steelperAMS6415(GradeA,see7.1.1.1)orVARSAE4340steelperAMS6414(GradeB,see

),heattreatedperAMS2759/2ClassAtoatensilestrengthbetween260and280ksi(51to53RockwellCHardnessScale(HRC))asdeterminedaccordingtoTestMethodsE18.Round-ingperPracticeE29permitsanabsolutehardnessrangeof50.6to53.4HRCoftheaverageofthreemeasurements.

Othersteelsorfinalhardnessesmayonlybesubsti-tutedifagreeduponbythecognizantengineeringauthority.Deviationsfromthebaselineshallbereportedasrequiredin

12.1.2.

9.2.4Roughmachineblanksasrequired.

9.2.5Heattreatasafinishedparttoastrengthlevelof260to280ksiperAMS2759/2ClassAorBasfollows:

Austenitizeat1500-1550°Finaprotectiveatmo-sphereandthenquenchinoil.

Doubletemper,2heach,at425-490°F.

9.2.6Verifyheattreatresponsebypulling4specimensinaccordancewithTestMethodE8/E8MandTable1.

9.2.7Finishmachinethereducedsectionandnotchconfigu-ration.

Theentirenotchshallbegroundtosize.

Single-pointmachiningofthenotchisnotpermit-ted.

Burnishingofthenotchisnotpermitted.

Shotpeening/blasting/mechanicalcleaningofthenotchduringspecimenmanufacturingisnotpermitted.

9.2.8Aftergrinding,allspecimensshallreceiveastressreliefbakeat375±25°F(190±14℃)perAMS2759/11for4-5h.Asuitableprotectionfromdiscolorationduetosurfaceoxidationshallbeusedduringthestressreliefbake.

9.2.9Acidorcathodicelectrolyticcleaningisprohibited.

9.2.10Straighteningafterfinalheattreatmentisprohibited.

9.3Storage:

9.3.1Afterstressreliefbaking,allspecimensshallbe

protectedduringstoragetopreventcorrosion.Asuitablemeansofprotectionistocoatthespecimenwithacorrosionpreven-tivecompoundmeetingtherequirementsofMIL-PRF-16173,Grade2.

9.4Inspection:

9.4.1Alotshallconsistofthosespecimenscutfromthesameheatofsteelinthesameorientation,heattreatedtogetherinthesamefurnaceload,quenchedandtemperedtogetherandsubjectedtothesamemanufacturingprocessestogether.

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9.4.2AllnotchedspecimensinthelotshallbesuitablefortestpurposesiftheinspectionresultsonsamplesfromthatlotconformtotherequirementsofTable1and9.5.

9.5SensitivityTest:

9.5.1ThesensitivitytohydrogenembrittlementshallbedemonstratedforeachlotofspecimensbyexposingsixtrialspecimenstotwodifferentembrittlingenvironmentsaftermanufactureandinspectioninaccordancewithSection9.

ThreespecimensshallbeelectroplatedunderthehighlyembritlingconditionsproducedinabrightcadmiumcyanidebathbyTreatmentA(Table2)andtheremainingthreespecimensshallbeelectroplatedunderthelessembrittlingconditionsofTreatmentB(Table2).Anequivalentplating/coatingorimposedpotentialmaybeusedonlywiththeapprovalofthecognizantengineeringauthorityifitssensitivityisdemonstratedtobeequivalenttothatfoundinTable2.

9.5.2UsingtheSLTmethod,eachlotofspecimenshallbeofsuitablesensitivityonlyifallthreespecimensplatedbyTreatmentAfracturewithin24handnoneofthethree