DIN EN ISO 4507-2007 Sintered ferrous materials carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test (ISO 4507 2000)English.pdf

1、May 2007DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 77.040.10; 77.160!,xbD“9856

2、333www.din.deDDIN EN ISO 4507Sintered ferrous materials, carburized or carbonitrided Determination and verification of case-hardening depth by amicro-hardness test (ISO 4507:2000)English version of DIN EN ISO 4507:2007-05Sinter-Eisenwerkstoffe, aufgekohlt oder karbonitriert Bestimmung und Prfung der

3、 Einsatzhrtungstiefe durch Messung der Mikrohrte(ISO 4507:2000)Englische Fassung DIN EN ISO 4507:2007-05SupersedesDIN ISO 4507:2001-04www.beuth.deDocument comprises 10 pages 08.07DIN EN ISO 4507:2007-05 2 National foreword This standard was prepared by Technical Committee ISO/TC 119/SC 3 “Sampling a

4、nd testing methods for sintered metal materials (excluding hardmetals)” and has been adopted as EN ISO 4507:2007 by Technical Committee CEN/SS M11 “Powder metallurgy” (Secretariat: CMC). The responsible German body involved in its preparation was the Normenausschuss Werkstofftechnologie (Materials T

5、echnology Standards Committee), Technical Committee NA 145-01-03 Probenahme und Prf-verfahren fr Sintermetalle (ausgenommen Hartmetalle). The DIN Standard corresponding to the International Standard referred to in clause 2 of the EN is as follows: ISO 2639 DIN EN ISO 2639 Amendments This standard di

6、ffers from DIN ISO 4507:2001-04 as follows: a) The number of the standard has been modified. b) International Standard 4507:2000 has been adopted without alteration as a European Standard. Previous editions DIN V 30911-5: 1986-06 DIN 30911-5: 1990-10 DIN ISO 4507: 2001-04 National Annex NA (informat

7、ive) Bibliography DIN EN ISO 2639:2003, Steels Determination and verification of the depth of carburized and hardened cases (ISO 2639:2002) EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4507 February 2007 ICS 77.160; 77.040.10 English Version Sintered ferrous materials, carburized or carb

8、onitrided - Determination and verification of case-hardening depth by a micro-hardness test (ISO 4507:2000) Matriaux ferreux fritts, cments ou carbonitrurs - Dtermination et vrification de la profondeur de cmentation, par mesurage de la microduret (ISO 4507:2000) Sinter-Eisenwerkstoffe, aufgekohlt o

9、der karbonitriert - Bestimmung und Prfung der Einsatzhrtungstiefe durch Messung der Mikrohrte (ISO 4507:2000) This European Standard was approved by CEN on 28 December 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europ

10、ean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (Englis

11、h, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria,

12、Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION

13、 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4507:2007: EForeword The text of ISO 4507:2000 has been

14、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. This European Standard shall be given

15、 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 national standards organizations

16、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, Norway, Poland, Portugal, Romania, Sl

17、ovakia, 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. 2 EN ISO 4507:2007 (E) 1 ScopeThis International Standard specifies methods for determining the case-hardening depth o

18、f carburized orcarbonitrided sintered ferrous materials by micro-hardness measurement.The methods are adapted to materials having porosity and only apply to quenched materials.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute

19、 provisions ofthis International Standard. For dated references, subsequent amendments to, or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of

20、the normative documents indicated below. Forundated references, the latest edition of the normative document referred to applies. Members of ISO and IECmaintain registers of currently valid International Standards.ISO 2639, Steel Determination and verification of the effective depth of carburized an

21、d hardened cases.ISO 4498:1), Sintered metal materials, excluding hardmetals Determination of apparent hardness and micro-hardness.3 Term and definitionFor the purposes of this International Standard, the following term and definition applies.3.1case-hardening depthCHDdistance, measured normal to th

22、e surface of a case-hardened workpiece at a point at which the hardnesscorresponds to a specified limit1) To be published. (Cancels and replaces ISO 4498-1:1990 and ISO 4498-2:1981)3 EN ISO 4507:2007 (E) 4PrincipleMeasuring of the micro-hardness by the Vickers testing method in accordance with ISO 4

23、498:, Procedure 2. It ismeasured on a section taken normal to the surface.Drafting a curve representing hardness as a function of distance from the surface of the test piece. This allows agraphical determination of the case depth (method A).Reading the case-hardening depth from this curve at the poi

24、nt corresponding to a specified hardness, usually550 HV 0,1.By agreement between the parties concerned, another value may be specified. In this case, the specified value isdistinguished from the standard value by the symbol HG (given value).In this International Standard the symbol HG is used to mea

25、n the specified hardness corresponding to the casedepth, considering that 550 HV 0,1 is a particular value for it (it is the standard one).The basic method A may be simplified for rapid spot checking (method B). In method B, the hardness is measuredat two points situated at either side of the approx

26、imate case depth. The accurate case-hardening depth is thenobtained by interpolation.5 Apparatus5.1 Vickers or Knoop micro-hardness testing machine, capable of applying a predetermined load of0,980 7 N (HV 0,1) to an accuracy of Gb1 1%.5.2 Measuring instrument, capable of measuring the diagonals of

27、the indentation to an accuracy of 0,5 G6dm.6 Procedure6.1 GeneralMicro-hardness measurements shall be made on a section of the sintered piece cut at right angles to the surface inan area chosen by agreement between supplier and user.The test shall be made with a Vickers or Knoop diamond indentor.The

28、 test load shall be 0,980 7 N (HV 0,1).6.2 Preparation of sampleThe surface on which the measurement is to be made shall be polished to a smoothness sufficient to permit correctmeasurements of the micro-hardness indentation. All precautions shall be taken to avoid damage to the edges ofthe specimen,

29、 overheating and changes of the surface due to smearing of the pores.NOTE Preparation of the sample may be facilitated by impregnation with a thermosetting plastic.4 EN ISO 4507:2007 (E) 6.3 Method A Determination of case-hardening depth6.3.1 Position of micro-hardness impressionsSeeFigure1.For each

30、 depth d1, d2, d3, etc., make at least three indentations.Discard the lowest individual hardness value if it is obviously too low (e.g. owing to porosity) or if by including thislow value the hardness range of the other points is more than doubled. In all cases of a discarded value, make areplacemen

31、t indentation.Make indentations at depths d1, d2, d3, etc. (measured in millimetres from the surface) as follows:0,05; 0,1; 0,2; 0,3; 0,4; 0,5; 0,75; 1; 1,5; 2; 3 where d1=0,05etc.The distance between two adjacent indentations, S, shall be not less than 2,5 times the diagonal of the impression.Inden

32、tations shall be within a zone, perpendicular to the surface, of width W equal to 1,5 mm.Figure 1 Position of micro-hardness impressions6.3.2 EvaluationCalculate the arithmetic mean of the hardness values obtained at each depth and plot these mean values on agraph of hardness versus distance from th

33、e surface (see Figure 2). Draw the best fit through the plotted points.Then draw the horizontal line at the ordinate HG corresponding to the specified value of hardness.The case-hardening depth CHD is then given by the abscissa of the intercept of this line and the curve of variationof hardness.The

34、accuracy of the determination depends upon the number of indentations at each depth.Extra indentations in the region of the approximate case depth will improve accuracy if the result is imprecise dueto a small angle of intersection beween the curve and the horizontal line.5 EN ISO 4507:2007 (E) Figu

35、re 2 Determination of case-hardening depth using method A6.4 Method A modified Determination of case-hardening depth6.4.1 Position of micro-hardness impressionsWhen the microstructure and porosity conditions are such that it is impractical to take hardness readings at pre-selected depths, then it is

36、 permissible to simply plot individual hardness readings versus depth below surface.6.4.2 EvaluationDraw the best fit through the plotted points.Draw a horizontal line at the ordinate, HG, corresponding to the specified value of hardness.The case-hardening depth CHD is then given by the abscissa of

37、the intercept of this line and the curve of variationof hardness.6.5 Method B Inspection test for case-hardening depth6.5.1 GeneralIt is assumed that the curve which represents the case depth as a function of hardness can be regarded as astraight line in the region of the case-hardening depth establ

38、ished by method A.6.5.2 Position of micro-hardness impressionsPrepare the section in the same manner as for method A, but measure the micro-hardness at only two depths, d1and d2, from the surface (see Figure 3).Choose the depths d1and d2so that d1is less than the estimated case-hardening depth and d

39、2is greater than theestimated case-hardening depth but less than the total case depth.6 EN ISO 4507:2007 (E) Choose d1and d2on the basis of past experience with similar materials or a previously plotted hardness curve,established on a similar material, as in method A. Make at least five micro-hardne

40、ss impressions at each of the twodepths.The distances between adjacent impressions, and also the elimination of low values, shall be subject to the samerules as in method A.If the hardnesses measured at depths d1and d2are both greater than or both less than that of the case-hardeningdepth, then meth

41、od A shall be used to determine the case-hardening depth.6.5.3 EvaluationCalculate the arithmetic mean of the hardness values obtained at each depth. Then use one or the other of the twofollowing methods.a) Graphical method (see Figure 3)Use a graph of hardness versus distance from the surface. Plot

42、 the two mean hardnesses H1and H2against thedepths d1and d2respectively. Join the two points by a straight line.The case-hardening depth CHD is given by the abscissa of the intercept of this line with a horizontal line drawn onthe ordinate HG (corresponding to specified case hardness).b) Calculation

43、 methodCalculate the case-hardening depth CHD using the formulaCHD G3dG2bG2dG2dG2ddddHHH121112bgdiHGwhereHG is the specified hardness;H1and H2are the arithmetic means of the values of hardness measured at distances d1and d2(see Figure 3).Figure 3 Determination of case-hardening depth using method B7

44、 EN ISO 4507:2007 (E) 7 PrecisionInterlaboratory evaluation conducted by MPIF2)using a slightly different protocol and reported in MPIF 523)givesthe following precision statement.Gbe Repeatability: for a case-hardening depth of 0,75 mm, duplicate results from the same laboratory shall not beconsider

45、ed suspect at the 95 % confidence level unless they differ by more than 0,14 mm.Gbe Reproducibility: for the same test specimen, duplicated results from two different laboratories shall not beconsidered suspect at the 95 % confidence level unless they differ by more than 0,47 mm.8 Test reportThe tes

46、t report shall include the following information:a) reference to this International Standard, i.e. ISO 4507;b) all details necessary for identification of the test sample (with details of heat treatment, if necessary);c) the area of the part on which the tests were carried out;d) the method used (me

47、thod A, method A modified or method B) and the specified value of hardnesscorresponding to case-hardening depth;e) the result obtained;f) all operations not specified by this International Standard or regarded as optional;g) details of any occurrence which may have affected the result.2)Metal Powder Industries Federation, USA.3) MPIF 52:1994, Determination of Effectiveness of Case Depth of Powder Metallurgy Products.8 EN ISO 4507:2007 (E)