hardness test —. Part 1: Test method. Matériaux métalliques — Essai de dureté Vickers —. Partie 1: Méthode d’essai. STANDARD. ISO. Fourth edition. ISO INTERNATIONAL. STANDARD. ISO. Third edition. Metallic materials — Vickers hardness test —. Part 1: Test method. Matériaux . 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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Unless otherwise specified, no part of this publication may be reproduced or lso 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. Figure 1 — Principle of the test The Vickers hardness is proportional to the quotient obtained by dividing uso test force by the sloping area of iwo indentation, which is assumed to be a right pyramid with a square base, and having at the vertex the same angle as the indenter.
NOTE 2 In general, decreasing the test force increases the scatter of results of the measurements. In GUM, it is recommended to use a correction to compensate for such systematic effects. Your Alert Profile lists the documents that will be monitored. NOTE 1 For indentation diagonals less than 0, mm, the increase of the uncertainty has to be considered.
As a reference, an EA guideline  is available.
ISO ： 金属维氏硬度试验 第一部分：试验方法 – MBA智库文档
These performance uncertainties reflect the combined effect to all the separate uncertainties indirect verification. Standards Subsctiption may be the perfect solution. Care should be taken, if standard uncertainties of type A and B are summarised, that the contributions are not counted twice see Clause 650-1 of GUM: 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.
ISO shall ieo be held responsible for identifying any or all such patent rights. The procedure for the determination of Ucorr is explained in Table D. Such conversions, therefore, should be avoided, unless a reliable basis for conversion can be obtained by comparison tests.
NOTE Other values e. If not, an indirect verification should be performed. The distance between the centres of two adjacent 650-1 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. For undated references, the latest edition of the referenced document including any amendments applies.
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. Add to Alert PDF. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.
ISO consists of the following parts, under the general title Metallic materials — Vickers hardness test: 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. In downloading this file, parties accept therein the responsibility of not infringing Adobe’s licensing policy.
The corresponding effect on the termination of the formation of an indentation can make alterations in the hardness value. It may not always be possible to quantify all the identified contributions to the uncertainty. NOTE 1 A strict comparison of hardness values is only possible at identical test forces. If the difference is greater, this shall be stated in the test report.
You may delete a document from your Alert Profile at any time. As the voice of the U. NOTE There is evidence that some materials may be sensitive to the rate of straining which causes small changes in the value of the yield strength. Already Subscribed to this document.
This part of ISO specifies the Vickers hardness test method, for the three different ranges of test force for metallic materials including hardmetals. The check involves at least one indentation being made on a hardness reference block, calibrated in accordance with ISO For low-force hardness and microhardness tests, the maximum time shall not exceed 10 s.
Subscription pricing is determined by: It is important that the test piece lies firmly on the support so that displacement cannot occur during the test. A record of these results should be maintained over a period of time, and used to measure reproducibility and monitor drift of the machine. Ihre Klassifizierung und Auswirkung auf die Messwerte. Please first log in with a verified email before subscribing to alerts. The measured dimension should agree with the certified value to within the maximum permissible error given in Table 5 of ISO In this case, an estimate of type A standard uncertainty may be obtained from the statistical analysis of repeated indentations into the test piece.
It is intended to make the annex normative in the next revision of this part of ISO Standard.
BS EN ISO 6507-1:2018
The work of preparing International Standards is normally carried out through ISO technical committees. There is no general process of accurately converting Vickers hardness into other scales of hardness or into tensile strength.
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. VDI-Berichte 11pp.
The support surfaces shall be clean and free from foreign matter scale, oil, dirt, 65071. If the measuring system fails this test, appropriate action should be taken. The finish of the surface shall permit accurate determination of the diagonal length of the indentation. There is no correction of the hardness values with respect to the error.
Naturally, direct calibration and the verification of these machines should be at 65077-1 highest possible accuracy. HV 2,5 24,52 N may be used. In accordance with Adobe’s licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing.