1、BRITISH STANDARD BS ISO 3057:1998 Non-destructive testing Metallographic replica techniques of surface examination ICS77.040.20BSISO 3057:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and co
2、mes intoeffect on 15 May1998 BSI04-1999 ISBN0 580 29158 8 National foreword This British Standard reproduces verbatim ISO3057:1998 and implements it as the UK national standard. It supersedes BS5166:1974 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee
3、 WEE/46, Non-destructive testing, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Eur
4、opean developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Stan
5、dards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
6、for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages 1 and 2 and a back cover. This standard
7、 has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS ISO 3057:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Forewo
8、rd iii Text of ISO3057 1ii blankBS ISO3057:1998 ii BSI 04-1999 Contents Page Foreword iii 1 Scope 1 2 Surface preparation 1 2.1 Degreasing 1 2.2 Macrographic preparation 1 2.3 Micrographic preparation 1 3 Application of the replicate 1 3.1 General 1 3.2 Varnish replicate 1 3.3 Sheet replicate 1 4 Re
9、moval of the replica from the surface 1 5 Mounting and examination of the replica 2BS ISO3057:1998 BSI 04-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standar
10、ds is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take
11、 part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International S
12、tandard requires approval by at least75% of the member bodies casting a vote. International Standard ISO3057 was prepared by Technical Committee ISO/TC135, Non-destructive testing, Subcommittee SC2, Surface methods. This second edition cancels and replaces the first edition (ISO3057:1974), which has
13、 been technically revised. Descriptors: Tests, non-destructive tests, microscopic analysis, surface condition, examination, replicas.iv blankBSISO 3057:1998 BSI 04-1999 1 1 Scope This International Standard specifies techniques of surface examination in which a transparent nitrocellulose varnish, or
14、 plastic material, with or without supports, is used to record inhomogeneities, both mechanical and metallurgical, in the condition of a metal surface. The techniques specified in this International Standard have the advantage of being suitable for some locations where access is restricted. In addit
15、ion, the replicas can be inspected on site with low-power optical aids or they may be transferred to a laboratory and examined under a powerful metallurgical microscope. 2 Surface preparation 2.1 Degreasing The surface shall be thoroughly cleaned, degreased and dried. This is achieved by the applica
16、tion of a suitable, approved solvent followed by acetone or alcohol and drying in heated air. 2.2 Macrographic preparation This preparation is applicable to all surfaces, including those resulting from service conditions, and to fracture faces. It calls for nothing more than the cleaning, degreasing
17、 and drying referred to in2.1 above. 2.3 Micrographic preparation 2.3.1 This is intended for examination aimed at revealing the metallurgical state of the surface. After degreasing, the surface shall be subjected to series of mechanical grinding operations followed by series of mechanical polishing
18、operations, each one progressively finer than the preceding one. In general, the dressing of the surface need not extend to a depth of more than0,2mm. In many cases, it will be considerably less. During these operations, care should be taken to avoid over-heating and work-hardening the metal by ensu
19、ring that excessive pressure is not applied to the polishing tool. It is advisable to criss-cross successive grinding and polishing runs and to clean the surface after each run with acetone or alcohol. 2.3.2 The mechanical polishing described above shall be followed by a final polishing. This may be
20、 done in any of the following ways: 1) by electrolytic means using suitable equipment and electrolyte; 2) by electrolytic means in a small bath; 3) by mechanical polishing with diamond paste or other compounds that will produce the desired surface. After the polishing has been completed, the surface
21、 shall be cleaned and dried as described in2.1. The final stage of the surface preparation is etching with an appropriate reagent(s). After etching, the surface shall once again be cleaned and dried as described in2.1. 3 Application of the replicate 3.1 General All possible precautions shall be take
22、n to ensure that the replicate is applied under the driest possible conditions with all dust excluded. 3.2 Varnish replicate The varnish shall be transparent and of a nitrocellulose or plastic base. Great care shall be taken not to agitate it prior to application, as such agitation can give rise to
23、the formation of air bubbles which have a detrimental effect on results. The varnish shall be spread over the surface by a means that does not give rise to turbulence, air bubbles and brush marks, so as to form a thin layer of uniform thickness. The varnish shall be allowed to dry in accordance with
24、 the manufacturers recommendations. 3.3 Sheet replicate 3.3.1 The surface to be examined and/or the replica shall be moistened with a suitable solvent. A piece of sheet plastic material of suitable composition and size and of a thickness that will ensure a durable and representative replica shall be
25、 placed over the surface. 3.3.2 It is recommended that the central part of the plastic sheet be placed near the middle of the surface to be examined. This facilitates the removal of displaced solvent and thus helps to avoid the formation of creases and air bubbles. To help the plastic sheet to adher
26、e to the metal surface, it might be necessary to apply pressure to it with the fingers, starting at the middle and pressing out in the direction of two opposite edges. 4 Removal of the replica from the surface 4.1 The replica shall be carefully removed from the surface in such a manner as to keep it
27、 in one piece. 4.2 Great care should be taken to maintain a smooth, continuous action and to avoid finger marking the replica while this is being done.BSISO3057:1998 2 BSI 04-1999 5 Mounting and examination of the replica 5.1 The replica shall be examined in either reflected or direct light. For exa
28、mination in reflected light, the replica shall be fixed to a mirror or to a metal plate with a good reflecting surface (for example by means of adhesive tape) in such a way that the surface containing the impression is facing the objective lens of a microscope. Alternatively, the surface not contain
29、ing the impression may be made reflecting by vacuum deposition of aluminium on it. 5.2 For examination in direct light, the replica shall be treated as though it were a lantern slide and mounted between two glass plates and its image projected on to a screen. NOTEIt is very important to ensure that
30、the replica is not damaged, either by stretching during mounting or by excessive heat from the light source during examination.blankBS ISO 3057:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards
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