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AS 2028-1977 Methods for the measurement of the depth of hardening in flame and induction hardened steel prod

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									                                                                                                                AS 2028—1977




                                                                                           Australian Standard®
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           METHODS FOR THE MEASUREMENT OF

                                                                                           DEPTH OF HARDENING
                                                                                           IN FLAME AND INDUCTION
                                                                                           HARDENED STEEL
                                                                                           PRODUCTS
                                                                                           The following scientific, industrial and governmental organizations and departments
                                                                                           were officially represented on the committee entrusted with the preparation of this
                                                                                           standard:

                                                                                                Associated Chambers of Manufactures of Australia
                                                                                                Bureau of Steel Manufacturers of Australia
                                                                                                Commonwealth Aircraft Corporation
                                                                                                Department of Defence
                                                                                                Federated Chamber of Automotive Industries
                                                                                                Institute of Steel Service Centres of Australia
                                                                                                Metal Trades Industry Association of Australia
                                                                                                Railways of Australia Committee
                                                                                                Society of Automotive Engineers — Australasia
                                                                                                Telecom Australia
                                                                                                University of New South Wales (School of Metallurgy)
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           The standard, prepared by Committee MT/8, Metallography, was approved by the
                                                                                           Metals Standards Board on behalf of the Council of the Standards Association of
                                                                                           Australia on 1 December 1976, and was published on 1 June 1977.



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                                                                                                   This standard was issued in draft form for public review as DR 75153.
                                                                                                                                                               AS 2028—1977




                                                                                           Australian Standard®
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           METHODS FOR THE MEASUREMENT OF

                                                                                           DEPTH OF HARDENING
                                                                                           IN FLAME AND INDUCTION
                                                                                           HARDENED STEEL
                                                                                           PRODUCTS




                                                                                            First publi shed . . . . . . . . . . . . . . . . . . . . . . . .   1977




                                                                                           PUBLISHED BY STANDARDS AUSTRALIA
                                                                                           (STANDARDS ASSOCIATION OF AUSTRALIA)
                                                                                           1 THE CRESCENT, HOMEBUSH, NSW 2140
                                                                                                                                                                      ISBN 0 7262 1204 0
                                                                                           AS 2028—1977                                                      2


                                                                                                                                                       PREFACE

                                                                                                          This standard was prepared by the Association’s Committee on Metallography to
                                                                                                          provide standard procedures for the measurement of the depth of hardened surface
                                                                                                          layers.
                                                                                                          The standard is one of a series relating to the use of micrographic and macrographic
                                                                                                          procedures for the measurement of case depth and decarburization in steel products,
                                                                                                          the others in the series being AS 1982, Methods for the Measurement of Case Depth
                                                                                                          in Steels, and AS 2003, Methods for the Measurement of Decarburization in Carbon
                                                                                                          and Low Alloy Steels.
                                                                                                          This standard describes four methods for the measurement of the depth of hardened
                                                                                                          surface layers. Each method should be considered on its own merits, and in terms of
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                                          the time and equipment necessary for the determination.
                                                                                                          However, the hardness test method is preferred for normal testing purposes, and when
                                                                                                          a referee method is required the microhardness test method should be specified. The
                                                                                                          macroscopic method is considered to be acceptable for routine testing purposes
                                                                                                          provided that the depth of hardening is greater than 0.25 mm.
                                                                                                          During preparation of the standard, the committee considered the International
                                                                                                          Standards Organization publication ISO 3754, Steel — Determination of Effective
                                                                                                          Depth of Hardening after Flame or Induction Hardening, and resolved to align this
                                                                                                          standard in its essentials with the ISO standard as far as was practicable.
                                                                                                          However, differences between the two standards still exist; in particular this standard
                                                                                                          describes four procedures for the measurement of case depth while ISO 3754 describes
                                                                                                          only one. The two standards also differ in the definition of effective case depth. ISO
                                                                                                          relies on a specified hardness limit minus 100 at a specified depth (unless otherwise
                                                                                                          agreed) whereas the Australian standard sets a lower limit of 400 HV which arises
                                                                                                          from the history of accepted practice in Australia.
                                                                                                          This standard may require reference to the following standards:
                                                                                                          AS 1817         Method for Vickers Hardness Test
                                                                                                                          Part 1 — Testing of Metals
                                                                                                          ASTM E384 Methods of Test for Microhardness of Materials.




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                                                                                                                                                3                                  AS 2028—1977


                                                                                                              STANDARDS ASSOCIATION OF AUSTRALIA


                                                                                                                                 Australian Standard
                                                                                                         METHODS FOR THE MEASUREMENT OF DEPTH
                                                                                                          OF HARDENING IN FLAME AND INDUCTION
                                                                                                               HARDENED STEEL PRODUCTS



                                                                                           1 SCOPE. This standard describes four methods for the measurement of the depth
                                                                                           of hardening (case depth) in steel products that has been produced by flame or
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           induction hardening processes, viz:

                                                                                           (a)   the   hardness method;
                                                                                           (b)   the   micrographic method;
                                                                                           (c)   the   macroscopic method;
                                                                                           (d)   the   microhardness method.


                                                                                           2     DEFINITIONS. For the purpose of this standard the following definitions apply:

                                                                                           2.1 Case — a surface layer having a higher hardness than the core (such differences
                                                                                           arise from micrographic changes which occur as a result of heating, by flame or
                                                                                           induction methods, and quenching).

                                                                                           2.2 Core — that portion of the steel product which is unaffected by the case
                                                                                           hardening process.

                                                                                           2.3 Effective case depth — the distance measured along a line normal to the original
                                                                                           surface to the point where the hardness first equals a specified hardness value.

                                                                                           2.4 Total case depth — the distance measured along a line normal to the original
                                                                                           surface of a hardened case to a point where differences in physical properties of the
                                                                                           case and core cannot be distinguished.
                                                                                                 NOTE: ‘Case depth’ is normall y taken to be the eff ecti ve case depth.

                                                                                           2.5 Test sample — a portion of material or a group of items selected from a batch
                                                                                           or consignment by a sampling procedure.

                                                                                           2.6 Test specimen — a portion of material or a single item taken from the test
                                                                                           sample for the purpose of applying a particular test.

                                                                                           2.7 Test piece — a prepared piece for testing, made from a test specimen by some
                                                                                           mechanical operation.


                                                                                           3 PRINCIPLE OF METHODS. The metallurgical changes which take place as a
                                                                                           result of heating of the surface layer and subsequent quenching enable hardness,
                                                                                           micrographic, and macroscopic methods to be used for the measurement of the depth
                                                                                           of hardening.
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                                                                                                             AS 2028-1977, Methods for the measurement of
                                                                                                             the depth of hardening in flame and induction
                                                                                                             hardened steel products
This is a free 5 page sample. Access the full version at http://infostore.saiglobal.com.




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