【英文标准名称】:StandardPracticeforMagneticParticleExaminationofSteelForgingsUsingAlternatingCurrent
【原文标准名称】:用交流电检验锻钢磁性微粒的标准实验方法
【标准号】:ASTMA966/A966M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:A01.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acmagnetization;circularmagnetization;drymethod;ferriticsteelforgings;fluorescentmethod;longitudinalmagnetization;surfaceflawdetection;wetmethod;A-C(alternating-current)magneticproperties;Magneticparticleinspection;Magneticproper
【摘要】:Forferromagneticmaterials,magneticparticleexaminationiswidelyspecifiedforthedetectionofsurfaceandnear-surfaceflawssuchascracks,laps,seams,andlinearlyorientednonmetallicinclusions.SuchexaminationsareincludedasmandatoryrequirementsinsomeforgingstandardssuchasSpecificationsA508/A508MandA963/A963M.Useofalternatingcurrentasthepowersourceformagneticparticleexaminationimposesasignificantrestrictiononthedetectionofsubsurfaceindications,sothattheprocedureisessentiallylimitedtothefindingofflawsthatareopentothesurface.Attentionthereforeisdrawntotheneedtohavethecomponentinthefinish-machinedconditionbeforeconductingthemagneticparticleexamination.Thepresenceofresidualmagneticfieldsinacomponentmaybeundesirable,andanadvantageoftheuseofanACpowersourceformagneticparticleexaminationisthatanacceptablelevelofdemagnetizationcanbereadilyachieved.1.1Thispracticecoversaprocedureforthemagneticparticleexaminationofsteelforgingsusingalternatingcurrentasthepowersource.Theprocedurewillproduceconsistentresultsuponwhichacceptancestandardscanbebased.Thispracticedoesnotcontainacceptancelimitsorrecommendedqualitylevels.1.2Onlyalternating50x2013;60cyclecurrentshallbeusedastheelectricpowersourceforanyofthemagnetizingmethods.1.3Whensubsurfaceindicationsaresoughtinforgings,thendcmagnetizationinaccordancewithPracticeA275/A275Mshouldbeused.1.4Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;thereforeeachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.Unlesstheorderspecifiestheapplicablex201C;Mx201D;specificationdesignation[SIunits],theinch-poundunitsshallbeused.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H21
【国际标准分类号】:77_040_20
【页数】:6P.;A4
【正文语种】:英语