1、BRITISH STANDARD BS EN ISO 4507:2007 Incorporating amendment no. 1 (renumbers BS ISO 4507:2000 as BS EN ISO 4507:2007) Sintered ferrous materials, carburized or carbonitrided Determination and verification of case-hardening depth by a micro-hardness test The European Standard EN ISO 4507:2007 has th
2、e status of a British Standard ICS 77.040.10; 77.160 BS EN ISO 4507:2007 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 2000 BSI 2007 ISBN 0 580 34673
3、0 National foreword This British Standard was published by BSI. It is the UK implementation of EN ISO 4507:2007. It is identical with ISO 4507:2000. The UK participation in its preparation was entrusted to Technical Committee ISE/65, Sintered metal components. A list of organizations represented on
4、this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued
5、since publication Amd. No. Date Comments 17025 30 March 2007 Renumbers BS ISO 4507:2000 as BS EN ISO 4507:2007EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO4507 February2007 ICS77.160;77.040.10 EnglishVersion Sinteredferrousmaterials,carburizedorcarbonitrided Determinationandverificationofcase
6、hardeningdepthbya microhardnesstest(ISO4507:2000) Matriauxferreuxfritts,cmentsoucarbonitrurs Dterminationetvrificationdelaprofondeurde cmentation,parmesuragedelamicroduret(ISO 4507:2000) SinterEisenwerkstoffe,ausgekohltoderkarbonitriert BestimmungundPrfungderEinsatzhrtungstiefedurch MessungderMikroh
7、rte(ISO4507:2000) ThisEuropeanStandardwasapprovedbyCENon28December2006. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchna
8、tional standardsmaybeobtainedonapplicationtotheCENManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCENManagementCentrehasthesames
9、tatusas the officialversions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Cyprus,CzechRepublic,Denmark,Estonia,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,P ortugal, Romania,Slovakia,Slovenia,Spain,Swe
10、den,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2007CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO4507:2007:E Foreword T
11、he text of ISO 4507:2000 has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 4507:2007 by Technical Committee CEN/SS M11 “Powder metallurgy“, the secretariat of which is held by CMC. Thi
12、s European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. According to the CEN/CENELEC Internal Regulations, the
13、 national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
14、way, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 4507:2000 has been approved by CEN as EN ISO 4507:2007 without any modifications. EN ISO 4507:2007Referencenumber ISO4507:2000(E) INTERNATIONAL STANDARD ISO 4507 Seco
15、ndedition 2000-03-01 Sinteredferrousmaterials,carburizedor carbonitridedDeterminationand verificationofcase-hardeningdepthbya micro-hardnesstest Matriaux ferreux fritts, cments ou carbonitrurs Dtermination et vrification de la profondeur de cmentation, par mesurage de la microduret EN ISO 4507:2007P
16、rintedinSwitzerland ii iii Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISO memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcomm
17、itteehasbeenestablishedhas therighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,in liaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnical Commission(IEC)onallmattersofelectrotechnicalstandardization. InternationalS
18、tandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. Attentionisdrawntothepossibil
19、itythatsomeoftheelementsofthisInternationalStandardmaybethesubjectof patentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights. InternationalStandardISO4507waspreparedbyTechnicalCommitteeISO/TC119, Powder metallurgy, SubcommitteeSC3, Sampling and testing methods for sintered me
20、tal materials (excluding hardmetals). Thissecondeditioncancelsandreplacesthefirstedition(ISO4507:1978)whichhasbeentechnicallyrevised. EN ISO 4507:2007blank 1 Sinteredferrousmaterials,carburizedorcarbonitrided Determinationandverificationofcase-hardeningdepthbya micro-hardnesstest 1 Scope ThisInterna
21、tionalStandardspecifiesmethodsfordeterminingthecase-hardeningdepthofcarburizedor carbonitridedsinteredferrousmaterialsbymicro-hardnessmeasurement. Themethodsareadaptedtomaterialshavingporosityandonlyapplytoquenchedmaterials. 2 Normativereferences Thefollowingnormativedocumentscontainprovisionswhich,
22、throughreferenceinthistext,constituteprovisionsof thisInternationalStandard.Fordatedreferences,subsequentamendmentsto,orrevisionsof,anyofthese publicationsdonotapply.However,partiestoagreementsbasedonthisInternationalStandardareencouragedto investigatethepossibilityofapplyingthemostrecenteditionsoft
23、henormativedocumentsindicatedbelow.For undatedreferences,thelatesteditionofthenormativedocumentreferredtoapplies.MembersofISOandIEC maintainregistersofcurrentlyvalidInternationalStandards. ISO2639, Steel Determination and verification of the effective depth of carburized and hardened cases. ISO4498:
24、 1) , Sintered metal materials, excluding hardmetals Determination of apparent hardness and micro- hardness. 3 Termanddefinition ForthepurposesofthisInternationalStandard,thefollowingtermanddefinitionapplies. 3.1 case-hardeningdepth CHD distance,measurednormaltothesurfaceofacase-hardenedworkpieceata
25、pointatwhichthehardness correspondstoaspecifiedlimit 1)Tobepublished.(CancelsandreplacesISO4498-1:1990andISO4498-2:1981) EN ISO 4507:20072 4Principle Measuringofthemicro-hardnessbytheVickerstestingmethodinaccordancewithISO4498:,Procedure2.Itis measuredonasectiontakennormaltothesurface. Draftingacurv
26、erepresentinghardnessasafunctionofdistancefromthesurfaceofthetestpiece.Thisallowsa graphicaldeterminationofthecasedepth(methodA). Readingthecase-hardeningdepthfromthiscurveatthepointcorrespondingtoaspecifiedhardness,usually 550HV0,1. Byagreementbetweenthepartiesconcerned,anothervaluemaybespecified.I
27、nthiscase,thespecifiedvalueis distinguishedfromthestandardvaluebythesymbolHG(givenvalue). InthisInternationalStandardthesymbolHGisusedtomeanthespecifiedhardnesscorrespondingtothecase depth,consideringthat550HV0,1isaparticularvalueforit(itisthestandardone). ThebasicmethodAmaybesimplifiedforrapidspotc
28、hecking(methodB).InmethodB,thehardnessismeasured attwopointssituatedateithersideoftheapproximatecasedepth.Theaccuratecase-hardeningdepthisthen obtainedbyinterpolation. 5 Apparatus 5.1 VickersorKnoopmicro-hardnesstestingmachine,capableofapplyingapredeterminedloadof 0,9807N(HV0,1)toanaccuracyof 1%. 5.
29、2 Measuringinstrument,capableofmeasuringthediagonalsoftheindentationtoanaccuracyof0,5 m. 6 Procedure 6.1 General Micro-hardnessmeasurementsshallbemadeonasectionofthesinteredpiececutatrightanglestothesurfacein anareachosenbyagreementbetweensupplieranduser. ThetestshallbemadewithaVickersorKnoopdiamond
30、indentor. Thetestloadshallbe0,9807N(HV0,1). 6.2 Preparationofsample Thesurfaceonwhichthemeasurementistobemadeshallbepolishedtoasmoothnesssufficienttopermitcorrect measurementsofthemicro-hardnessindentation.Allprecautionsshallbetakentoavoiddamagetotheedgesof thespecimen,overheatingandchangesofthesurf
31、aceduetosmearingofthepores. NOTE Preparationofthesamplemaybefacilitatedbyimpregnationwithathermosettingplastic. EN ISO 4507:2007 3 6.3 MethodADeterminationofcase-hardeningdepth 6.3.1 Positionofmicro-hardnessimpressions SeeFigure1. Foreachdepthd 1 ,d 2 ,d 3 ,etc.,makeatleastthreeindentations. Discard
32、thelowestindividualhardnessvalueifitisobviouslytoolow(e.g.owingtoporosity)orifbyincludingthis lowvaluethehardnessrangeoftheotherpointsismorethandoubled.Inallcasesofadiscardedvalue,makea replacementindentation. Makeindentationsatdepthsd 1 ,d 2 ,d 3 ,etc.(measuredinmillimetresfromthesurface)asfollows:
33、 0,05;0,1;0,2;0,3;0,4;0,5;0,75;1;1,5;2;3where d 1 =0,05etc. Thedistancebetweentwoadjacentindentations,S,shallbenotlessthan2,5timesthediagonaloftheimpression. Indentationsshallbewithinazone,perpendiculartothesurface,ofwidthWequalto1,5mm. Figure1Positionofmicro-hardnessimpressions 6.3.2 Evaluation Cal
34、culatethearithmeticmeanofthehardnessvaluesobtainedateachdepthandplotthesemeanvaluesona graphofhardnessversusdistancefromthesurface(seeFigure2).Drawthebestfitthroughtheplottedpoints. ThendrawthehorizontallineattheordinateHGcorrespondingtothespecifiedvalueofhardness. Thecase-hardeningdepthCHDisthengiv
35、enbytheabscissaoftheinterceptofthislineandthecurveofvariation ofhardness. Theaccuracyofthedeterminationdependsuponthenumberofindentationsateachdepth. Extraindentationsintheregionoftheapproximatecasedepthwillimproveaccuracyiftheresultisimprecisedue toasmallangleofintersectionbeweenthecurveandthehoriz
36、ontalline. EN ISO 4507:20074 Figure2Determinationofcase-hardeningdepthusingmethodA 6.4 MethodAmodifiedDeterminationofcase-hardeningdepth 6.4.1 Positionofmicro-hardnessimpressions Whenthemicrostructureandporosityconditionsaresuchthatitisimpracticaltotakehardnessreadingsatpre- selecteddepths,thenitisp
37、ermissibletosimplyplotindividualhardnessreadingsversusdepthbelowsurface. 6.4.2 Evaluation Drawthebestfitthroughtheplottedpoints. Drawahorizontallineattheordinate,HG,correspondingtothespecifiedvalueofhardness. Thecase-hardeningdepthCHDisthengivenbytheabscissaoftheinterceptofthislineandthecurveofvaria
38、tion ofhardness. 6.5 MethodBInspectiontestforcase-hardeningdepth 6.5.1 General Itisassumedthatthecurvewhichrepresentsthecasedepthasafunctionofhardnesscanberegardedasa straightlineintheregionofthecase-hardeningdepthestablishedbymethodA. 6.5.2 Positionofmicro-hardnessimpressions Preparethesectioninthe
39、samemannerasformethodA,butmeasurethemicro-hardnessatonlytwodepths,d 1 andd 2 ,fromthesurface(seeFigure3). Choosethedepthsd 1 andd 2 sothatd 1 islessthantheestimatedcase-hardeningdepthandd 2 isgreaterthanthe estimatedcase-hardeningdepthbutlessthanthetotalcasedepth. EN ISO 4507:2007 5 Choosed 1 andd 2
40、 onthebasisofpastexperiencewithsimilarmaterialsorapreviouslyplottedhardnesscurve, establishedonasimilarmaterial,asinmethodA.Makeatleastfivemicro-hardnessimpressionsateachofthetwo depths. Thedistancesbetweenadjacentimpressions,andalsotheeliminationoflowvalues,shallbesubjecttothesame rulesasinmethodA.
41、 Ifthehardnessesmeasuredatdepthsd 1 andd 2 arebothgreaterthanorbothlessthanthatofthecase-hardening depth,thenmethodAshallbeusedtodeterminethecase-hardeningdepth. 6.5.3 Evaluation Calculatethearithmeticmeanofthehardnessvaluesobtainedateachdepth.Thenuseoneortheotherofthetwo followingmethods. a) Graphi
42、calmethod(seeFigure3) Useagraphofhardnessversusdistancefromthesurface.Plotthetwomeanhardnesses H 1 and H 2 againstthe depthsd 1 andd 2 respectively.Jointhetwopointsbyastraightline. Thecase-hardeningdepthCHDisgivenbytheabscissaoftheinterceptofthislinewithahorizontallinedrawnon theordinateHG(correspon
43、dingtospecifiedcasehardness). b) Calculationmethod Calculatethecase-hardeningdepthCHDusingtheformula CHD d ddH HH 1 211 12 bgdi HG where HGisthespecifiedhardness; H 1 and H 2 arethearithmeticmeansofthevaluesofhardnessmeasuredatdistancesd 1 andd 2 (seeFigure3). Figure3Determinationofcase-hardeningdep
44、thusingmethodB EN ISO 4507:20076 7 Precision InterlaboratoryevaluationconductedbyMPIF 2) usingaslightlydifferentprotocolandreportedinMPIF52 3) gives thefollowingprecisionstatement. Repeatability:foracase-hardeningdepthof0,75mm,duplicateresultsfromthesamelaboratoryshallnotbe consideredsuspectatthe95%
45、confidencelevelunlesstheydifferbymorethan0,14mm. Reproducibility:forthesametestspecimen,duplicatedresultsfromtwodifferentlaboratoriesshallnotbe consideredsuspectatthe95%confidencelevelunlesstheydifferbymorethan0,47mm. 8 Testreport Thetestreportshallincludethefollowinginformation: a) referencetothisI
46、nternationalStandard,i.e.ISO4507; b) alldetailsnecessaryforidentificationofthetestsample(withdetailsofheattreatment,ifnecessary); c) theareaofthepartonwhichthetestswerecarriedout; d) themethodused(methodA,methodAmodifiedormethodB)andthespecifiedvalueofhardness correspondingtocase-hardeningdepth; e)
47、theresultobtained; f) alloperationsnotspecifiedbythisInternationalStandardorregardedasoptional; g) detailsofanyoccurrencewhichmayhaveaffectedtheresult. 2) MetalPowderIndustriesFederation,USA. 3)MPIF52:1994, Determination of Effectiveness of Case Depth of Powder Metallurgy Products. EN ISO 4507:2007b
48、lankBS EN ISO 4507:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to impr
