ASTM B925-2008 粉末冶金测试样品制备标准惯例

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【英文标准名称】:StandardPracticesforProductionandPreparationofPowderMetallurgy(PM)TestSpecimens
【原文标准名称】:粉末冶金测试样品制备标准惯例
【标准号】:ASTMB925-2008
【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】:B09.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:compactingtoolset;die;metalpowderproperties;PMmaterials;powdermetallurgytooling;powdertesting;sinteredmaterialproperties;testspecimens;Metallographicpreparation;Powdermetallurgy(P/M)materials
【摘要】:TestspecimensareusedtodeterminetheengineeringpropertiesofPMmaterials,forexample,tensilestrength,ductility,impactenergy,etc.;propertydatathatareessentialtothesuccessfuluseofPMmaterialstandards.ProcessingPMtestspecimensunderproductionconditionsisthemostefficientmethodbywhichtoobtainreliablePMmaterialpropertydatasinceinmostcasesitisimpracticalorimpossibletocuttestbarsfromsinteredparts.Theperformancecharacteristicsofmetalpowders,forexample,compressibility,greenstrengthanddimensionalchangesassociatedwithprocessingareevaluatedusingPMtestspecimensundercontrolledconditions.ThedataobtainedareimportanttobothmetalpowderproducersandPMpartsmanufacturers.PMtestspecimensplayasignificantroleinindustrialqualityassuranceprograms.Theyareusedtocomparepropertiesofanewlotofmetalpowderwithanestablishedlotinanacceptancetestandareusedinthepartmanufacturingprocesstoestablishandadjustproductionvariables.InthoseinstanceswhereitisrequiredtopresentequivalentpropertydataforaproductionlotofPMparts,standardtestspecimenscompactedfromtheproductionpowdermixtothesamegreendensitycanbeprocessedwiththeproductionPMpartsandthentestedtoobtainthisinformation.MaterialpropertytestingperformedforindustrialoracademicresearchanddevelopmentprojectsusesstandardPMtestspecimenssothetestresultsobtainedcanbecomparedwithpreviousworkorpublisheddata.Powdermetallurgytestspecimensmayhavemultipleuses.Thedimensionsandtolerancesgiveninthisstandardarenominalinmanycases.Theuseriscautionedtomakecertainthatthedimensionsofthetestspecimenareinagreementwiththerequirementsofthespecifictestmethodtobeused.1.1ThesestandardpracticescoverthespecificationsforthoseuniaxiallycompactedtestspecimensthatareusedinASTMstandards,theproceduresforproducingandpreparingthesetestspecimens,andreferencetheapplicablestandards.1.2Basictooldesignandengineeringinformationregardingthetoolingthatisrequiredtocompactthetestspecimensandmachiningblanksarecontainedintheannexes.1.3Thisstandardisintendedtobeacomprehensiveone-sourcedocumentthatcanbereferencedbyASTMtestmethodsthatutilizePMtestspecimensandinASTMPMmaterialspecificationsthatcontaintheengineeringdataobtainedfromthesetestspecimens.1.4Thesepracticesarenotapplicabletometalpowdertestspecimensthatareproducedbyotherprocessessuchascoldisostaticpressing(CIP),hotisostaticpressing(HIP),powderforging(PF)ormetalinjectionmolding(MIM).Theydonotpertaintocementedcarbidematerials.1.5DetailedinformationonPMpresses,compactingtoolingandsinteringfurnaces,theirdesign,manufactureandusearenotwithinthescopeofthesepractices.1.6Testspecimenanddiecavitydimensionsshownininch-poundunitsaretoberegardedasstandardandareapplicabletothereferencedASTMtestmethodsandmaterialspecifications.ValuesinSIunitsareshowninparenthesesandresultfromconversioninaccordancewithIEEE/ASTMStandardSI10.Theymaybeapproximateandareonlyforinformation.1.7Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:15P.;A4
【正文语种】:英语