【astm標(biāo)準(zhǔn)】b 777 - 15

1、Designation:B777?15StardSpecificationfTungstenBaseHighDensityMetal1ThisstardisissuedunderthefixeddesignationB777thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastr

2、evision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoverstherequirementsffourclassesofmachinablehighdensitytungst

3、enbasemetalproducedbyconsolidatingmetalpowdermixturesthecompositionofwhichismainlytungsten.Thismaterialspecificationmaybeusedfbarepartsfpartsthatmaybecoatedwithothermaterialsfprotectionagainstcrosionabrasion.1.2Thisspeci

4、ficationdescribesphysicalmechanicalmicrostructuraltestingofamateriallotbasedontheuseoftestcouponsnotactualparts.Sinteredpropertiestypicallyvarybothwithpartsizesamplinglocationwithinagivenpart.Resultsobtainedfromcoupontes

5、tingmaytherefedifferfromthepropertiesofaspecificlocationinalargerpart.1.3IntendedUse—Partsmadefromthismaterialareintendedfusessuchasweightscounterbalancesinstaticdynamicbalancinghighspeedrotatinginertiamembersradiationsh

6、ieldinghypervelocityimpactvibrationdampingapplications.Iningtheappropriatealloyfagivenapplicationitisimptanttonotethatasthetungstencontentofthealloyisincreasedstiffnessradiationattenuationdensityincreasewithanaccompanyin

7、gdecreaseinattainableductility.1.4SpecialApplications—FparticularapplicationspropertiesrequirementsotherthanthosespecifiedinSections567ofthisspecificationmaybeimptant.Thesealloysmaycontainelementswhichmakethemweaklyferro

8、magic.Wherefreedomfrommagicresponseisrequiredthisshouldbespecifiedinthepurchaseder.Class4isnotavailableinanonmagicgrade.Fpurposesofthisspecificationnonmagicmaterialisdefinedasmaterialhavingamaximummagicpermeabilityof1.05

9、(seeTestMethodA342).Alsofspecialapplicationsinvolvinglargesectionsmethodsfdetermininginternalqualitysuchasmechanicaltestingofspecimensexcisedfromtheselargersectionssuitablenondestructivetestsmaybeapplied.Ifsuchpartproper

10、tydataarerequiredanadditionalpartspecifictestprogramshallbespecifiedinthepurchaseder.1.5Thevaluesstatedininchpoundunitsaretoberegardedasstard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedf

11、infmationonlyarenotconsideredstard.2.ReferencedDocuments2.1ASTMStards:2A342TestMethodsfPermeabilityofWeaklyMagicMaterialsB311TestMethodfDensityofPowderMetallurgy(PM)MaterialsContainingLessThanTwoPercentPosityD3951Practic

12、efCommercialPackagingE3GuidefPreparationofMetallographicSpecimensE8E8MTestMethodsfTensionTestingofMetallicMaterialsE18TestMethodsfRockwellHardnessofMetallicMaterialsE407PracticefMicroetchingMetalsAlloys2.2FederalStard:Fe

13、d.Std.No.151MetalsTestMethods33.Classification3.1Thetungstenbasemetalshallbeofthefollowingclasses(seeTable1Table2)asspecified(see4.1).4.deringInfmation4.1dersftungstenbasehighdensitymetalshouldspecifythefollowing:4.1.1Ti

14、tledesignationyearofissueofthisspecification4.1.2Class(see3.1)4.1.3Quantity4.1.4Levelsofpreservationpacking(see9.1)4.1.5Specialmarkingsifrequired(see9.2)4.1.6MethodofhardnesstestingifdifferentfromRockwell“C”(seeTable1)1T

15、hisspecificationisunderthejurisdictionofASTMCommitteeB10onReactiveRefractyMetalsAlloysisthedirectresponsibilityofSubcommitteeB10.04onMolybdenumTungsten.CurrenteditionapprovedDec.12015.PublishedDecember2015.iginallyapprov

16、edin1987.Lastpreviouseditionapprovedin2013asB777–07(2013).DOI:10.1520B077715.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocument

17、SummarypageontheASTMwebsite.3AvailablefromDLADocumentServicesBuilding4D700RobbinsAve.PhiladelphiaPA191115094:quicksearch.dla.mil.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedState

18、s1ASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofi

19、nfringementofsuchrightsareentirelytheirownresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.Yourcommentsareinvitedeith

20、erfrevisionofthisstardfadditionalstardsshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Ifyoufeelthatyourcommentsha

21、venotreceivedafairhearingyoushouldmakeyourviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualrep

22、rints(singlemultiplecopies)ofthisstardmaybeobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).PermissionrightstophotocopythestardmayalsobesecuredfromtheCop

23、yrightClearanceCenter222RosewoodDriveDanversMA01923Tel:(978)6462600TABLE2TensilePropertiesMinimumValuesClassStardAlloysNonmagicAlloysUltimateStrength0.2%OffsetYieldELAUltimateStrength0.2%OffsetYieldELAksi(MPa)ksi(MPa)(%)