ASTM E1181-2002(2008) 双重晶粒度表征的标准试验方法
作者:标准资料网 时间:2024-05-16 07:47:17 浏览:9640
来源:标准资料网
下载地址: 点击此处下载
【英文标准名称】:StandardTestMethodsforCharacterizingDuplexGrainSizes
【原文标准名称】:双重晶粒度表征的标准试验方法
【标准号】:ASTME1181-2002(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:E04.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:areafraction;banding;bands;duplex;grainsize;necklace;Alloys;Areafractions;Banding;Bimodaldistribution;Comparisontechniques;Crystallatticestructure;Distribution;Duplexgrainstructures;Etching(materials/process);Grainsize;Imageana
【摘要】:Duplexgrainsizemayoccurinsomemetalsandalloysasaresultoftheirthermomechanicalprocessinghistory.Forcomparisonofmechanicalpropertieswithmetallurgicalfeatures,orforspecificationpurposes,itmaybeimportanttobeabletocharacterizegrainsizeinsuchmaterials.Assigninganaveragegrainsizevaluetoaduplexgrainsizespecimendoesnotadequatelycharacterizetheappearanceofthatspecimen,andmayevenmisrepresentitsappearance.Forexample,averagingtwodistinctlydifferentgrainsizesmayresultinreportingasizethatdoesnotactuallyexistanywhereinthespecimen.Thesetestmethodsmaybeappliedtospecimensorproductscontainingrandomlyintermingledgrainsoftwoormoresignificantlydifferentsizes(henceforthreferredtoasrandomduplexgrainsize).Examplesofrandomduplexgrainsizesinclude:isolatedcoarsegrainsinamatrixofmuchfinergrains,extremelywidedistributionsofgrainsizes,andbimodaldistributionsofgrainsize.Thesetestmethodsmayalsobeappliedtospecimensorproductscontaininggrainsoftwoormoresignificantlydifferentsizes,butdistributedintopologicallyvaryingpatterns(henceforthreferredtoastopologicalduplexgrainsizes).Examplesoftopologicalduplexgrainsizesinclude:systematicvariationofgrainsizeacrossthesectionofaproduct,necklacestructures,bandedstructures,andgerminativegraingrowthinselectedareasofcriticalstrain.Thesetestmethodsmaybeappliedtospecimensorproductsregardlessoftheirstateofrecrystallization.Becausethesetestmethodsdescribedeviationsfromasingle,log-normaldistributionofgrainsizes,andcharacterizepatternsofvariationingrainsize,thetotalspecimencross-sectionmustbeevaluated.Thesetestmethodsarelimitedtoduplexgrainsizesasidentifiablewithinasinglepolishedandetchedmetallurgicalspecimen.Ifduplexgrainsizeissuspectedinaproducttoolargetobepolishedandetchedasasinglespecimen,macroetchingshouldbeconsideredasafirststepinevaluation.Theentiremacroetchedcross-sectionshouldbeusedasabasisforestimatingareafractionsoccupiedbydistinctgrainsizes,ifpossible.Ifmicroscopicexaminationissubsequentlynecessary,individualspecimensmustbetakentoallowestimationofareafractionsfortheentireproductcross-section,andtoallowdeterminationofgrainsizesrepresentingtheentirecross-sectionaswell.Thesetestmethodsareintendedtobeappliedtoduplexgrainsizes.Duplexgrainstructures(forexample,multiphasealloys)arenotnecessarilyduplexingrainsize,andassucharenotthesubjectofthesemethods.However,thetestmethodsdescribedhereforareafractionestimationmaybeofuseindescribingduplexgrainstructures.1.1Thesetestmethodsprovidesimpleguidelinesfordecidingwhetheraduplexgrainsizeexists.Thetestmethodsseparateduplexgrainsizesintooneoftwodistinctclasses,thenintospecifictypeswithinthoseclasses,andprovidesystemsforgrainsizecharacterizationofeachtype.1.2Units8212;ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcernsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoconsultappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortoitsuse.
【中国标准分类号】:A42
【国际标准分类号】:19_120
【页数】:15P.;A4
【正文语种】:英语
【原文标准名称】:双重晶粒度表征的标准试验方法
【标准号】:ASTME1181-2002(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:E04.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:areafraction;banding;bands;duplex;grainsize;necklace;Alloys;Areafractions;Banding;Bimodaldistribution;Comparisontechniques;Crystallatticestructure;Distribution;Duplexgrainstructures;Etching(materials/process);Grainsize;Imageana
【摘要】:Duplexgrainsizemayoccurinsomemetalsandalloysasaresultoftheirthermomechanicalprocessinghistory.Forcomparisonofmechanicalpropertieswithmetallurgicalfeatures,orforspecificationpurposes,itmaybeimportanttobeabletocharacterizegrainsizeinsuchmaterials.Assigninganaveragegrainsizevaluetoaduplexgrainsizespecimendoesnotadequatelycharacterizetheappearanceofthatspecimen,andmayevenmisrepresentitsappearance.Forexample,averagingtwodistinctlydifferentgrainsizesmayresultinreportingasizethatdoesnotactuallyexistanywhereinthespecimen.Thesetestmethodsmaybeappliedtospecimensorproductscontainingrandomlyintermingledgrainsoftwoormoresignificantlydifferentsizes(henceforthreferredtoasrandomduplexgrainsize).Examplesofrandomduplexgrainsizesinclude:isolatedcoarsegrainsinamatrixofmuchfinergrains,extremelywidedistributionsofgrainsizes,andbimodaldistributionsofgrainsize.Thesetestmethodsmayalsobeappliedtospecimensorproductscontaininggrainsoftwoormoresignificantlydifferentsizes,butdistributedintopologicallyvaryingpatterns(henceforthreferredtoastopologicalduplexgrainsizes).Examplesoftopologicalduplexgrainsizesinclude:systematicvariationofgrainsizeacrossthesectionofaproduct,necklacestructures,bandedstructures,andgerminativegraingrowthinselectedareasofcriticalstrain.Thesetestmethodsmaybeappliedtospecimensorproductsregardlessoftheirstateofrecrystallization.Becausethesetestmethodsdescribedeviationsfromasingle,log-normaldistributionofgrainsizes,andcharacterizepatternsofvariationingrainsize,thetotalspecimencross-sectionmustbeevaluated.Thesetestmethodsarelimitedtoduplexgrainsizesasidentifiablewithinasinglepolishedandetchedmetallurgicalspecimen.Ifduplexgrainsizeissuspectedinaproducttoolargetobepolishedandetchedasasinglespecimen,macroetchingshouldbeconsideredasafirststepinevaluation.Theentiremacroetchedcross-sectionshouldbeusedasabasisforestimatingareafractionsoccupiedbydistinctgrainsizes,ifpossible.Ifmicroscopicexaminationissubsequentlynecessary,individualspecimensmustbetakentoallowestimationofareafractionsfortheentireproductcross-section,andtoallowdeterminationofgrainsizesrepresentingtheentirecross-sectionaswell.Thesetestmethodsareintendedtobeappliedtoduplexgrainsizes.Duplexgrainstructures(forexample,multiphasealloys)arenotnecessarilyduplexingrainsize,andassucharenotthesubjectofthesemethods.However,thetestmethodsdescribedhereforareafractionestimationmaybeofuseindescribingduplexgrainstructures.1.1Thesetestmethodsprovidesimpleguidelinesfordecidingwhetheraduplexgrainsizeexists.Thetestmethodsseparateduplexgrainsizesintooneoftwodistinctclasses,thenintospecifictypeswithinthoseclasses,andprovidesystemsforgrainsizecharacterizationofeachtype.1.2Units8212;ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcernsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoconsultappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortoitsuse.
【中国标准分类号】:A42
【国际标准分类号】:19_120
【页数】:15P.;A4
【正文语种】:英语
下载地址: 点击此处下载