ASTM B661-12 Standard Practice for Heat Treatment of Magnesium Alloys

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1、Designation:B661−12StandardPracticefor1HeatTreatmentofMagnesiumAlloysThisstandardisissuedunderthefixeddesignationB661;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asup

2、erscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*tibletoaging,thereisauniquerangeoftime-temperaturecombinationstowhichitwillrespond.1.1Thispracticeisintendedasanaidinestablishingasuitableproce

3、durefortheheattreatmentofmagnesiumalloys3.1.2heattreatment—Acombinationofheatingandcoolingtoassureproperphysicalandmechanicalproperties.operationsappliedtoametaloralloyinthesolidstatetoobtaindesiredconditionsofproperties.Heatingforthesolepurpose1.2Timesandtemperaturesaretypicalforvariousforms,of

4、hotworkingisexcludedfromthemeaningofthisdefinition.sizes,andmanufacturingmethodsandmaynotexactlyde-scribetheoptimumheattreatmentforaspecificitem.3.1.3solutionheattreatment—AtreatmentinwhichanConsequently,itisnotintendedthatthispracticebeusedasaalloyisheatedtoasuitabletemperatureandheldatthissubsti

5、tuteforadetailedproductionprocessorprocedure.temperatureforasufficientlengthoftimetoallowadesired1.3Thisstandarddoesnotpurporttoaddressalloftheconstituenttoenterintosolidsolution,followedbyrapidsafetyconcerns,ifany,associatedwithitsuse.Itisthecoolingtoholdtheconstituentinsolution.Thematerialisth

6、enresponsibilityoftheuserofthisstandardtoestablishappro-inasupersaturated,unstablestate,andmaysubsequentlypriatesafetyandhealthpracticesanddeterminetheapplica-exhibitAgeHardening.bilityofregulatorylimitationspriortouse.3.1.4quenching—Rapidcooling.Whenapplicable,thefol-lowingmorespecifictermsshoul

7、dbeused:stillairquenching,2.ReferencedDocumentsforcedairquenching,hotwater/polymerquenching.22.1ASTMStandards:3.1.5T4—Solutionheat-treatedandnaturallyagedtoaB557TestMethodsforTensionTestingWroughtandCastsubstantiallystableco