ASTM E1814-1996(2007) 涂层的计算机层析摄影(CT)检查的标准实施规范
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【英文标准名称】:StandardPracticeforComputedTomographic(CT)ExaminationofCastings
【原文标准名称】:涂层的计算机层析摄影(CT)检查的标准实施规范
【标准号】:ASTME1814-1996(2007)
【标准状态】:现行
【国别】:
【发布日期】:1996
【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】:E07.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:castings;computedtomography;CT;examination;NDE;nondestructiveevaluation;nondestructiveexamination
【摘要】:CTmaybeperformedonanobjectwhenitisintheas-cast,intermediate,orfinalmachinedcondition.ACTexaminationcanbeusedasadesigntooltoimprovewaxformsandmoldings,establishprocessparameters,randomlycheckprocesscontrol,performfinalqualitycontrol(QC)examinationfortheacceptanceorrejectionofparts,andanalyzefailuresandextendcomponentlifetimes.ThemostcommonapplicationsofCTforcastingsareforthefollowing:locatingandcharacterizingdiscontinuities,suchasporosity,inclusions,cracks,andshrink;measuringas-castpartdimensionsforcomparisonwithdesigndimensions;andextractingdimensionalmeasurementsforreverseengineering.TheextenttowhichaCTimagereproducesanobjectorafeaturewithinanobjectisdictatedlargelybythecompetinginfluencesofspatialresolution,contrastdiscrimination,andartifactsoftheimagingsystem.Operatingparametersstrikeanoverallbalancebetweenimagequality,examinationtime,andcost.ArtifactsareoftenthelimitingfactorinCTimagequality.(SeePracticeE1570foranin-depthdiscussionofartifacts.)Artifactsarereproduciblefeaturesinanimagethatarenotrelatedtoactualfeaturesintheobject.Artifactscanbeconsideredcorrelatednoisebecausetheyformrepeatablefixedpatternsundergivenconditionsyetcarrynoobjectinformation.Forcastings,itisimperativetorecognizewhatisandisnotanartifactsinceanartifactcanobscureormasqueradeasadiscontinuity.Artifactsaremostprevalentincastingswithlongstraightedgesorcomplexgeometries,orboth.1.1Thispracticecoversauniformprocedurefortheexaminationofcastingsbythecomputedtomography(CT)technique.TherequirementsexpressedinthispracticeareintendedtocontrolthequalityofthenondestructiveexaminationbyCTandarenotintendedforcontrollingtheacceptabilityorqualityofthecastings.Thispracticeimplicitlysuggeststheuseofpenetratingradiation,specificallyXraysandgammarays.1.2ThispracticeprovidesauniformprocedureforaCTexaminationofcastingsforoneormoreofthefollowingpurposes:1.2.1Examiningfordiscontinuities,suchasporosity,inclusions,cracks,andshrink;1.2.2Performingmetrologicalmeasurementsanddeterminingdimensionalconformance;and1.2.3Determiningreverseengineeringdata,thatis,creatingcomputer-aideddesign(CAD)datafiles.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificsafetystatements,seeSection7,NBSHandbook114,and21CFR1020.40and29CFR1910.96.
【中国标准分类号】:G50
【国际标准分类号】:77_040_20
【页数】:4P.;A4
【正文语种】:
【原文标准名称】:涂层的计算机层析摄影(CT)检查的标准实施规范
【标准号】:ASTME1814-1996(2007)
【标准状态】:现行
【国别】:
【发布日期】:1996
【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】:E07.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:castings;computedtomography;CT;examination;NDE;nondestructiveevaluation;nondestructiveexamination
【摘要】:CTmaybeperformedonanobjectwhenitisintheas-cast,intermediate,orfinalmachinedcondition.ACTexaminationcanbeusedasadesigntooltoimprovewaxformsandmoldings,establishprocessparameters,randomlycheckprocesscontrol,performfinalqualitycontrol(QC)examinationfortheacceptanceorrejectionofparts,andanalyzefailuresandextendcomponentlifetimes.ThemostcommonapplicationsofCTforcastingsareforthefollowing:locatingandcharacterizingdiscontinuities,suchasporosity,inclusions,cracks,andshrink;measuringas-castpartdimensionsforcomparisonwithdesigndimensions;andextractingdimensionalmeasurementsforreverseengineering.TheextenttowhichaCTimagereproducesanobjectorafeaturewithinanobjectisdictatedlargelybythecompetinginfluencesofspatialresolution,contrastdiscrimination,andartifactsoftheimagingsystem.Operatingparametersstrikeanoverallbalancebetweenimagequality,examinationtime,andcost.ArtifactsareoftenthelimitingfactorinCTimagequality.(SeePracticeE1570foranin-depthdiscussionofartifacts.)Artifactsarereproduciblefeaturesinanimagethatarenotrelatedtoactualfeaturesintheobject.Artifactscanbeconsideredcorrelatednoisebecausetheyformrepeatablefixedpatternsundergivenconditionsyetcarrynoobjectinformation.Forcastings,itisimperativetorecognizewhatisandisnotanartifactsinceanartifactcanobscureormasqueradeasadiscontinuity.Artifactsaremostprevalentincastingswithlongstraightedgesorcomplexgeometries,orboth.1.1Thispracticecoversauniformprocedurefortheexaminationofcastingsbythecomputedtomography(CT)technique.TherequirementsexpressedinthispracticeareintendedtocontrolthequalityofthenondestructiveexaminationbyCTandarenotintendedforcontrollingtheacceptabilityorqualityofthecastings.Thispracticeimplicitlysuggeststheuseofpenetratingradiation,specificallyXraysandgammarays.1.2ThispracticeprovidesauniformprocedureforaCTexaminationofcastingsforoneormoreofthefollowingpurposes:1.2.1Examiningfordiscontinuities,suchasporosity,inclusions,cracks,andshrink;1.2.2Performingmetrologicalmeasurementsanddeterminingdimensionalconformance;and1.2.3Determiningreverseengineeringdata,thatis,creatingcomputer-aideddesign(CAD)datafiles.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificsafetystatements,seeSection7,NBSHandbook114,and21CFR1020.40and29CFR1910.96.
【中国标准分类号】:G50
【国际标准分类号】:77_040_20
【页数】:4P.;A4
【正文语种】:
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