Transcription of NIST recommended practice guide : Rockwell …
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NIST recommended practice guide : Rockwell …
; |ocS? ~ , , , ,equipment, ,norisitintendedtoimplythattheentities,m aterials, (January2001) :(202)512-1800 Fax:(202)512-2250 Mail:StopSSOP,Washington, "goodpractice" ,muchoftheinformationgivenisalsoapplicab leforusersthatonlyrequiretestresultstobe withinwidetolerancebands, ; * ,ConsultantRichardAntonik, ' , , , ,NewageTestingInstruments, ,GilmoreDiamondTools, , , , , , ,Jr., , ,andJohnSongfortheircontributionstowards theRockwellhardnessstandardizationprogra matNIST.* ,Error, :AppliedForceEffect71 (a) (b) (FigureA) (FigureB)demonstratingtheeffectofanincre aseinthepreliminary-forceforaRockwellHRA test16 Figure3 (FigureA) (FigureB)demonstratingtheeffectofanincre aseinthetotal-forceforaRockwellHRAtest17 Figure4:Diagramofcross-sectionalviewofsp heroconicaldiamondindentertip24 Figure5:EightstepsoftheRockwelltestcycle 28 Figure6:Fourexamplesofthehardnessprofile acrossthetestsurfaceof25 HRCtestblocks, ,andthelocationsofthecertifiedvaluesforu ntestedlocationsareindicatedbytheopencir cles40 Figure8:Alternatepatternforrepeatability measurements48 Figure9:Illustrationofthethreebiaspoints correctedbyalinearfitcorrectioncurve50 Figure10:Illustrationofreproducibilityda tatakenovertendays51 Figure11:NISTR ockwellhardnessstandardizingmachine57 TableofContentsFigure12 (forhardnesslevelsasindicatedonthebottom axis) :ChangeintheRockwellhardnessvalueduetoac hang
;AlllOb222b5D NISI PUBLICATIONS guide RockwellHardness Measurementof MetallicMaterials SamuelR.Low |ocS? a.2~ I ationalInstituteof andardsandTechnology ichnologyAdministration S.DepartmentofCommerce
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