Microhardness refers to indentation hardness tests and ASTM E is the standard test method for Knoop and Vickers hardness testing of materials. Request a. Vickers Hardness Test. 18>. ➢ Brinell/Vickers durometer: ➢ Selectable load. ➢ pyramidal indenter. ➢ optical micrometer. ➢ procedure: ASTM E from 1 to . This standard is issued under the fixed designation E; the number immediately 1 This test method is under the jurisdiction of ASTM Committee E04 on.

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Microhardness Testing – ASTM E Microindentation Hardness | SGS MSi Testing

The Vickers indenter usually produces a geometrically similar indentation at all test forces. Measuring the hardness of surface layers such as plating or bonded layers. Material testing you can trust since This standard is not included in any packages. Click here to request a quote Chicago Lab: Small Samples unable to be tested by conventional methods. Microindentation tests permit hardness testing of specific phases or constituents and regions or gradients too small for evaluation by macroindentation tests.

Due to its rhombic shape, the indentation depth is shallower for a Knoop indentation compared to a Vickers indentation under identical test conditions. The success of the specimen preparation procedure in removing preparation-induced damage can, and will, influence test results; this problem becomes more critical as the test force decreases.

Add to Alert PDF. Need more than one copy? Thus, the Knoop indenter is very useful for evaluating hardness gradients or thin coatings of sectioned samples.


Hardness, although empirical in nature, can be correlated to tensile strength for many metals and alloys, and is also an indicator of machinability, wear axtm, toughness and ductility.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ASTM E Microhardness Testing Microhardness tests have been found to be very useful for materials evaluation, quality control of manufacturing processes and research and development efforts. Test loads are as low as 1 gram and as high as 1, grams, but are typically in the range of to grams.

If the test is being conducted to meet a specified bulk hardness value, such as HRC, then most such tests will be conducted with Knoop at a gf load. As the voice of the U.

High surface hardness will give good wear resistance but a softer core is aztm required to preserve ductility impact strength. Your Alert Profile lists the documents that will be monitored.

Proceed to Checkout Continue Shopping. Subscription pricing is determined by: Link to Active This link will always e3844 to the zstm Active version of the standard.

To determine these differences requires a very small physical indentation. Please first log in with a verified email before subscribing to alerts. No other units of measurement are included in this standard. You may delete a document from your Alert Profile at any time. Micro constituents of assemblies.

The Knoop indenter does not produce a geometrically similar indentation as a function of test force. This standard is also available to be included in Standards Subscriptions. Referenced Documents purchase separately The documents listed below are referenced within the subject standard ast are not provided as part of the standard. The majority of Knoop tests of case hardness variations are conducted at forces from to gf.


Hardness, although empirical in nature, can be correlated to tensile strength for many metals, and is an indicator of wear resistance and ductility. In e3384, the Asrm indenter is better suited for determining bulk average properties as Vickers hardness is not altered by the choice of the test force, from 25 to gf, because the indent geometry is constant as a function of indent depth.

Microhardness Testing Specific fields of application of microhardness testing include: Results are reported in a table with up to ten indents per sample. This method covers Knoop micro-hardness using an elongated pyramid indenter and Vickers micro-hardness using a square equilateral pyramid indenter.

ASTM E384 Microhardness Testing

Foil and thin wire. This test method covers determination of the microindentation hardness of materials. Because of the large difference between the long and short Knoop diagonals, the Knoop indenter is often better suited for determining variations of hardness over very small distances compared to the Vickers indenter.

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