Product Code:SAE AMS7304
Title:Springs, Steel, 0.85 - 1.05C, Hardened and Tempered After Forming (NONCURRENT November 2001)
Issuing Committee:Ams E Carbon And Low Alloy Steels Committee
Scope:This specification covers coiled springs fabricated from carbon-steel wire.【英文标准名称】:Advancedtechnicalceramics-Monolithicceramics-Generalandtexturalproperties-Part5:Determinationofphasevolumefractionbyevaluationofmicrographs;EnglishversionofDINEN623-5:2009-10
【原文标准名称】:先进技术陶瓷.单片陶瓷.一般和结构特性.第5部分:利用显微图像评估法测定相体积分数,德文版本EN623-5:2009
【标准号】:DINEN623-5-2009
【标准状态】:现行
【国别】:德国
【发布日期】:2009-10
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Advancedtechnicalceramics;Blankforms;Ceramics;Definitions;Determination;Forms(paper);Fractions;Grainsize;Instruments;Materialstesting;Mathematicalcalculations;Measurement;Measuringtechniques;Micrographics;Microstructure;Monolithicmaterials;Particlesizeanalysis;Photomicrography;Properties;Quality;Specimenpreparation;Structure;Testequipment;Testing
【摘要】:ThisparofEN623specifiesamanualmethodofmakingmeasurementsforthedeterminationofvolumefractionofmajorphasesinadvancedtechnicalceramicsusingmicrographsofpolishedandetchedsections,overlayingasquaregridoflinesandcountingthenumberofintersectionslyingovereachphase,NOTE1Thismethodassumesthatthetruephasevolumefractionsareequivalenttoareafractionsonarandomlycutcross-sectionaccordingtostereologicalprinciples,NOTE2GuidelinesforpolishingandetchingofadvancedtechnicalceramicscanbefoundinAnnexesAandB,Themethodappliestoceramicswithoneormoredistinctsecondaryphases,suchasfoundinAl0/ZrO,Si/SiC,orAl0SiC.Ifthetestmaterialcontainsdiscretepores,thesecanbetreatedasasecondaryphaseforthepurposeofthismethodprovidedthatthereisnoevidenceofgrainpluck-outduringpolishingbeingconfusedwithgenuinepores.NOTE3Ifthematerialcontainsmorethanabout20%porositythereisastrongriskthatthemicrostructurewillbedamagedduringthepolishingprocess,andmeasurementofvolumefractionofporesmaybecomemisleading.Secondaryphasevolumefractionsorporositypresentatlevelsoflessthan005aresubjecttoconsiderableerrorandpotentialscatterinresults,Alargernumberofmicrographsthantheminimumofthreeisnormallyneededtoimprovevtheconsistencyandaccuracyoftheresults,NOTE4Manyceramicscontainsmallamountsofsecondaryglassyphases.Inordertomakeareasonableestimateofglassyphasecontent,theglassmaterialbetweencrystallinegrainsshouldbereadilyobservable,andthusshouldbeatleast0,5μminwidth,ThemethodinthisEuropeanStandardisnotconsideredappropriatefornarrowglassyfilmsaroundgrainsThismethodassumesthattheselectedregionsofapreparedcross-sectionarestatisticallyrepresentativeofthewholesampledsection,NOTE5Microstructuresareseldomhomogeneous,andthephasecontentscanvaryfrommicrographtomicrograph.Itisessentialtosurveyasufficientlywideareaofthepreparedsectiontoensurethatthoseareasselectedforevaluationarerepresentativeanddonotcontaineye-catchingirregularities,SomeusersofthisEuropeanStandardcanwishtoapplyautomaticorsemiautomaticimageanalysistomicrographsordirectlycapturedmicrostructuralimages,ThisiscurrentlyoutsidethescopeofthisEuropeanStandardbutsomeguidelinesaregiveninAnnexC.
【中国标准分类号】:Q32
【国际标准分类号】:81_060_30
【页数】:20P.;A4
【正文语种】:英语