1、-DQXDU7UDQVODWLRQE,16SUDFKHQGLHQVW(QJOLVKSULFHJURXS1RSDUWRIWKLVWUDQVODWLRQPDEHUHSURGXFHGZLWKRXWSULRUSHUPLVVLRQRI,1HXWVFKHV,QVWLWXWIU1RUPXQJH9%HUOLQ%HXWK9HUODJ*PE+%HUOLQ*HUPDQKDVWKHHFOXVLYHULJKWRIVDOHIRU*HUPDQ6WDQGDUGV ,11RUPHQ , c) informative mechanical and physical properties of sintered metal mat
2、erials have been included in the relevant tables and a description of these properties is given in a new Clause 6 “Test methods for informative properties”; d) the tables containing requirements for the chemical composition and the mechanical and physical properties of sintered metal materials used
3、for bearings and structural parts have been technically revised; e) new tables have been included containing requirements for the chemical composition and the mechanical and physical properties of sintered metal materials for bearings and structural parts used for hybrid-alloy steels; f) Annex A “De
4、signation system” has been extended to include information on hybrid-alloy steels; g) Annex A “Designation system“ has been extended to include the letters assigned to the alloying element chromium; h) information on hybrid-alloy steels has been included in Annex B “Microstructures”. Previous editio
5、ns DIN ISO 5755: 2002-11, 2004-11 DIN EN ISO 5755:2013-01 3 National Annex NA (informative) Bibliography DIN EN ISO 2738, Sintered metal materials, excluding hardmetals Permeable sintered metal materials Determination of density, oil content and open porosity DIN EN ISO 2739, Sintered metal bushings
6、 Determination of radial crushing strength DIN EN ISO 2740, Sintered metal materials, excluding hardmetals Tensile test pieces DIN EN ISO 6892-1, Metallic materials Tensile testing Part 1 Method of test at room temperature DIN EN ISO 5755:2013-01 4 This page is intentionally blank EUROPEAN STANDARD
7、NORME EUROPENNE EUROPISCHE NORM EN ISO 5755 September 2012 ICS 77.160 English Version Sintered metal materials - Specifications (ISO 5755:2012) Matriaux mtalliques fritts - Spcifications Sintermetalle - Anforderungen (ISO 5755:2012) This European Standard was approved by CEN on 25 August 2012. CEN m
8、embers are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European 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 applic
9、ation to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, 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-CENELEC Mana
10、gement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi
11、a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN
12、 national Members. Ref. No. EN ISO 5755:2012: EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG(ISO 5755:2012) Contents Page Foreword . 3 1 Scope . 4 2 Normative references 4 3 Terms and definitions 5 4 Sampling . 6 5 Test methods for normative prope
13、rties . 6 5.1 General 6 5.2 Chemical analysis 6 5.3 Open porosity . 6 5.4 Mechanical properties . 7 6 Test methods for informative properties . 8 6.1 General 8 6.2 Density 8 6.3 Tensile strength 8 6.4 Tensile yield strength 8 6.5 Elongation . 8 6.6 Youngs modulus . 8 6.7 Poissons ratio 8 6.8 Impact
14、energy . 9 6.9 Compressive yield strength 9 6.10 Transverse rupture strength . 9 6.11 Fatigue strength . 9 6.12 Apparent hardness 10 6.13 Coefficient of linear expansion . 10 7 Specifications . 10 8 Designations . 10 Annex A (normative) Designation system . 36 Annex B (informative) Microstructures 3
15、9 Bibliography 42 2DIN EN ISO 5755:2013-01 EN ISO 5755:2012 (E) Foreword This document (EN ISO 5755:2012) has been prepared by Technical Committee ISO/TC 119 Powder metallurgy . This European Standard shall be given the status of a national standard, either by publication of an identical text or by
16、endorsement, at the latest by March 2013, and conflicting national standards shall be withdrawn at the latest by March 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for iden
17、tifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugo
18、slav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 5755:2012 has
19、 been approved by CEN as a EN ISO 5755:2012 without any modification. “”3DIN EN ISO 5755:2013-01 EN ISO 5755:2012 (E) 1 Scope This International Standard specifies the requirements for the chemical composition and the mechanical and physical properties of sintered metal materials used for bearings a
20、nd structural parts. When selecting powder metallurgical (PM) materials, it should be taken into account that the properties depend not only on the chemical composition and density, but also on the production methods. The properties of sintered materials giving satisfactory service in particular app
21、lications may not necessarily be the same as those of wrought or cast materials that might otherwise be used. Therefore, liaison with prospective suppliers is recommended. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refe
22、rences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 437, Steel and cast iron Determination of total carbon content Combustion gravimetric method ISO 1099, Metallic materials Fatigue testing Axial force-
23、controlled method ISO 1143, Metallic materials Rotating bar bending fatigue testing ISO 2738, Sintered metal materials, excluding hardmetals Permeable sintered metal materials Determination of density, oil content and open porosity ISO 2739, Sintered metal bushings Determination of radial crushing s
24、trength ISO 2740, Sintered metal materials, excluding hardmetals Tensile test pieces ISO 2795, Plain bearings Sintered bushes Dimensions and tolerances ISO 3325, Sintered metal materials, excluding hardmetals Determination of transverse rupture strength ISO 3928, Sintered metal materials, excluding
25、hardmetals Fatigue test pieces ISO 3954, Powders for powder metallurgical purposes Sampling ISO 4498, Sintered metal materials, excluding hardmetals Determination of apparent hardness and micro-hardness ISO 5754, Sintered metal materials, excluding hardmetals Unnotched impact test piece ISO 6892-1,
26、Metallic materials Tensile testing Part 1: Method of test at room temperature ISO 7625, Sintered metal materials, excluding hardmetals Preparation of samples for chemical analysis for determination of carbon content 4DIN EN ISO 5755:2013-01 EN ISO 5755:2012 (E) ISO 14317, Sintered metal materials, e
27、xcluding hardmetals Determination of compressive yield strength ASTM E228, Standard Test Method for Linear Thermal Expansion of Solid Materials with a Push-Rod Dilatometer ASTM E1875, Standard Test Method for Dynamic Youngs Modulus, Shear Modulus, and Poissons Ratio by Sonic Resonance 3 Terms and de
28、finitions For the purposes of this document, the following terms and definitions apply. 3.1 tensile strength Rm ability of a test specimen to resist fracture when a pulling force is applied in a direction parallel to its longitudinal axis expressed in MPa NOTE It is equal to the maximum load divided
29、 by the original cross-sectional area. 3.2 tensile yield strength Rp0,2load at which the material exhibits a 0,2 % offset from proportionality on a stress-strain curve in tension, divided by the original cross-sectional area expressed in MPa 3.3 Youngs modulus E ratio of normal stress to correspondi
30、ng strain for tensile or compressive stresses below the proportional limit of the material expressed in GPa 3.4 Poissons ratio v absolute value of the ratio of transverse strain to the corresponding axial strain, resulting from uniformally distributed axial stress below the proportional limit of the
31、 material 3.5 impact energy measurement of the energy absorbed when fracturing a specimen with a single blow measured in Joules (J) 3.6 compressive yield strength stress at which a material exhibits a specified permanent set expressed in MPa 3.7 transverse rupture strength stress, calculated from th
32、e bending strength formula, required to break a specimen of a given dimension expressed in MPa 3.8 fatigue strength maximum alternating stress that can be sustained for a specific number of cycles without failure, the stress being reversed with each cycle unless otherwise stated expressed in MPa 5DI
33、N EN ISO 5755:2013-01 EN ISO 5755:2012 (E) 3.9 radial crushing strength radial stress required to fracture a hollow cylindrical part of specified dimensions expressed in MPa 3.10 density mass per unit volume of the material expressed in g/cm33.11 apparent hardness resistance of a powder metallurgica
34、l (PM) material to indentation, tested under specified conditions; for PM materials, it is a function of the density of the material 3.12 open porosity oil content after full impregnation, divided by the volume of the test piece, and multiplied by 100 expressed as a volume percentage 3.13 coefficien
35、t of linear expansion change in length per unit length per degree change in temperature expressed in 106K14 Sampling Sampling of powders to produce standard test pieces shall be carried out in accordance with ISO 3954. 5 Test methods for normative properties 5.1 General The following test methods sh
36、all be used to determine the normative properties given in Tables 1 to 18. 5.2 Chemical analysis The chemical composition table for each material lists the principal elements by minimum and maximum mass percentage before any additional process, such as oil impregnation, resin impregnation or steam t
37、reatment, has taken place. “Other elements” may include minor amounts of elements added for specific purposes and is reported as a maximum percentage. Whenever possible, and always in cases of dispute, the methods of chemical analysis shall be those specified in the relevant International Standards.
38、 If no International Standard is available, the method may be agreed upon and specified at the time of enquiry and order. Samples for the determination of total carbon content shall be prepared in accordance with ISO 7625. Determination of the total carbon content shall be in accordance with ISO 437
39、. 5.3 Open porosity The open porosity shall be determined in accordance with ISO 2738. 6DIN EN ISO 5755:2013-01 EN ISO 5755:2012 (E) 5.4 Mechanical properties 5.4.1 General The as-sintered mechanical properties given in Tables 1 to 18 were determined on pressed and sintered test pieces with a mean c
40、hemical composition. The heat-treated mechanical properties given in Tables 1 to 18 were determined on test bars which were either pressed and sintered or machined from pressed and sintered blanks. They are intended as a guide to the initial selection of materials (see also Clause 1). They may also
41、be used as a basis for specifying any special tests that may be indicated on the drawing. The mechanical properties shall neither be calculated from hardness values nor be determined on tensile test pieces taken from a component and used for verifying the values given in Tables 1 to 18. If the custo
42、mer requires that a specified level of mechanical properties be obtained by tests on the component, these shall be agreed with the supplier and shall be stated on the drawing and/or any technical documentation of the customer referred to on the drawing. 5.4.2 Tensile properties The ultimate tensile
43、strength and the yield strength shall be determined in accordance with ISO 2740 and, ISO 6892-1. For heat-treated materials, tensile strength and yield strength are approximately equal and in this case, tensile strength is specified. The normative yield strengths (as-sintered condition) and ultimate
44、 tensile strengths (heat-treated condition) are shown as minimum values. These strengths may be used in designing PM part applications. To select a material which is optimum in both properties and cost-effectiveness, it is essential that the part application be discussed with the PM parts manufactur
45、er. The minimum values were developed from tensile specimens prepared specifically for evaluating PM materials. Tensile specimens machined from commercial parts may differ from those obtained from prepared tensile specimens. To evaluate the part strength, it is recommended that static or dynamic pro
46、of-testing be agreed between the purchaser and the manufacturer and carried out on the first production lot of parts. The results of testing to failure can be used statistically to determine a minimum breaking force for future production lots. Acceptable strength can also be demonstrated by processi
47、ng tensile specimens prepared specifically for evaluating PM materials manufactured from the same batch of powder as the production parts and processed with them. As indicated above, the testing of test bars machined from the PM component is the least desirable method for demonstrating minimum prope
48、rties. For heat-treated properties, the test bars were quench-hardened and tempered to increase the strength, hardness and wear resistance. Tempering is essential to develop the properties given in this International Standard. Heat-treat equipment that utilizes a gas atmosphere or vacuum is recommended. The use of liquid salts is not recommended due to entrapment of the salts in the porosity causing “salt bleed-out”
