hardness test —. Part 1: Test method. Matériaux métalliques — Essai de dureté Vickers —. Partie 1: Méthode d’essai. STANDARD. ISO. Fourth edition. Purchase your copy of BS EN ISO as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. I.S. EN ISO is the adopted Irish version of the European . The text of ISO has been approved by CEN as EN ISO.
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The specification for the product may indicate limits for the differences between the lengths of the two diagonals.
Independent of the type of sources, for hardness there are two possibilities for the determination of the uncertainty. If the difference is greater, this shall be stated in the test report.
In general, as a result of the measurement, method 1 [Equation D. If two adjacent indentations differ in size, the spacing shall be based on the mean diagonal length of the larger indentation.
For dated references, only the edition cited applies. How do I set a reading intention To set a reading intention, click through to any list item, and look for the panel on the left hand side: It should be noted that for anisotropic materials, for example those which have been heavily cold-worked, there will be a difference between the lengths of the two diagonals of the indentation. The support surfaces shall be clean and free from foreign matter scale, oil, dirt, etc.
Setting up reading intentions help you organise your course reading.
NBN EN ISO 6507-1
Setting a reading intention helps you organise your reading. ISO consists of the following parts, under the general title Metallic materials — Vickers hardness test: Such conversions, therefore, should be avoided, unless a reliable basis for conversion can be obtained by comparison tests. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
To set a reading intention, click through to any list item, and look for the panel on the left hand side:. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Verlag Berliner Union Stuttgart,pp The distance between the centres of two adjacent indentations shall be at least three times the mean diagonal length of the indentation in the case of steel, copper and copper alloys, and at least six times the mean diagonal length in the case of light metals, lead and tin and their alloys.
It is strongly recommended that this procedure be applied for a maximum of one year after the successful passing of a direct verification.
BS EN ISO 6507-1:2018
The arithmetical mean of the two readings shall be taken for the calculation of the Vickers hardness. In 65077-1 unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. It may not always be possible to quantify all the identified contributions to the uncertainty.
The chain starts at the international level using international definitions of the various hardness scales to carry 650-1 international intercomparisons. The correction factors are tabulated in terms of the ratio of the mean diagonal d of the indentation to the diameter D of the sphere.
NBN EN ISO | NBN
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Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s member body in the country of the requester. The required thickness is given by the point of intersection of the minimum thickness scale and a line shown dotted in the example in Figure A.
The corresponding effect on the termination of the formation of an indentation can make alterations in the hardness value.
Due to the small depth of Vickers microhardness indentations, it is essential that special precautions are taken during preparation.
Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.
Every care has been taken to ensure that the file is suitable for use by ISO member bodies. Reference number ISO M2 may lead to smaller values of uncertainty. In M1, the error limit, that means the range in which the machine is allowed to differ from the reference standard is used to define the source uE of the uncertainty.
VDI-Berichte 11pp. Please log in to set a read status. For undated references, the latest edition of the referenced document including any amendments applies. Care should be taken, if standard uncertainties of type A and B are summarised, that the contributions are not counted twice see Clause 4 of GUM: ISO shall not be held responsible for identifying any or all such patent rights.
You can filter on reading intentions from the listas well as view them within your profile. The error is no longer in the calculation of the uncertainty but all determined hardness values have to be corrected by b or Ucorr has to be increased by b. Introduction to Materials and Materials Forming Next: Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
The finish of the surface shall permit accurate determination of the diagonal length of the indentation. The procedure for the determination of U is explained in Table D.
There is no general process of accurately converting Vickers hardness into other scales of hardness or into tensile strength. No deformation shall be visible at the back of the test piece after the test.
ISO ： 金属维氏硬度试验 第一部分：试验方法 – MBA智库文档
Details of the software products used sn create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Here’s an example of what they look like:. NOTE 2 In general, decreasing the test force increases the scatter of results of the measurements. NOTE Other values e. Specifies the Vickers hardness test method, for the three different ranges of test force for metallic materials. The duration of the test force shall be 10 s to 15 s, except for tests on materials whose time-dependent properties would make this an unsuitable range.
The procedure for the determination of Ucorr ej explained in Table D.