Designation:F2078−15StandardTerminologyRelatingtoHydrogenEmbrittlementTesting1ThisstandardisissuedunderthefixeddesignationF2078;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologycoverstheprincipalterms,abbreviations,andsymbolsrelatingtomechanicalmethodsforhydrogenembrittlementtesting,whicharepresentinmorethanoneofthestandardsunderthejurisdictionofASTMCommit-teeF07onAerospaceandAircraft.Thesedefinitionsarepublishedtoencourageuniformityofterminologyinproductspecifications.2.ReferencedDocuments2.1ASTMStandards:2C904TerminologyRelatingtoChemical-ResistantNonme-tallicMaterialsD4848TerminologyRelatedtoForce,DeformationandRelatedPropertiesofTextilesE6TerminologyRelatingtoMethodsofMechanicalTestingE8TestMethodsforTensionTestingofMetallicMaterialsE631TerminologyofBuildingConstructionsE1823TerminologyRelatingtoFatigueandFractureTestingF109TerminologyRelatingtoSurfaceImperfectionsonCeramicsF1624TestMethodforMeasurementofHydrogenEm-brittlementThresholdinSteelbytheIncrementalStepLoadingTechniqueG15TerminologyRelatingtoCorrosionandCorrosionTest-ing(Withdrawn2010)33.SignificanceandUse3.1Thetermsusedindescribinghydrogenembrittlementhaveprecisedefinitions.Theterminologyanditsproperusagemustbecompletelyunderstoodtocommunicateandtransferinformationadequatelywithinthefield.3.2Thetermsdefinedinotherterminologystandards,arerespectivelyidentifiedinparenthesesfollowingthedefinition.4.Terminology4.1Definitions:baking—heatingtoatemperature,nottoexceed50°F(27.8°C)belowthetemperingoragingtemperatureofthemetaloralloy,inordertoremovehydrogenbeforeembrittlementoccursbytheformationofmicrocracks.DISCUSSION—Nometallurgicalchangestakeplaceasaresultofbaking.brittle—seebrittleness.brittleness—thetendencyofamaterialtobreakataverylowstrain,elongation,ordeflection,and...
