ASTM A956 PDF

A – 02 Standard Test Method for Leeb Hardness Testing of Steel Products, Dynamic Hardness Test, Equotip, Equotip Hardness Test, Leeb, Rebound. A/AM – 17 Standard Test Method for Leeb Hardness Testing of Steel Products, dynamic hardness test, Equotip, Equotip hardness test, Leeb, rebound . ASTM A – Download as PDF File .pdf), Text File .txt) or read online.

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The Leeb hardness number is followed by the symbol HL with one or more suffix characters representing the type of impact device. In order to reproduce the standard direction dependency, it is necessary to specify velocity and mass separately and to have a specific free flight length.

The width of the signal curve has some influence on the result, because it determines, how good the proportionality between mimimum value B and adtm velocity is. Permission rights to photocopy the standard may also be secured from the ASTM website www.

The impact body is now in its loaded or astmm position. The Leeb hardness value is read on the indicator device. All such conversions are.

Impact bodies show no fading even at high hardness levels compared to D device. This disadvantage is not apparent in instruments which operate according to the Krautkramer rebound method.

Please copy and paste this embed script asfm where you want to embed Embed Script. Furthermore, small differences, caused by production, in potential energy of the impact body in the tensioned state are compensated. The complete reproduction law is obtained by interpolation between these curve points so that the corresponding amplitude value u t1 can be allocated to each voltage value u t0 enabling the velocity ratio except at the zero positions themselves to be calculated.

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This is a measure for the velocity of the impact body: It is 9a56 that this test be performed with the test piece at rest. A9956 surfaces to be tested shall be smooth.

ASTM A / AM – 17 Standard Test Method for Leeb Hardness Testing of Steel Products

The results generated at that location do not represent the part at any other surface location and yield no information about the material at subsurface locations. The charging tube atm allowed to slowly return to the starting position.

Referenced Documents purchase separately Ast, documents listed below are referenced within the subject standard but are not provided as part of the standard. These induced voltages are proportional to the respective impact and rebound velocities. This is a measure for the velocity of the impact body: No point shall be impacted more than once.

Combining values from the two systems may result in non-conformance with the standard. The measurement readings determined by the latter method are erroneous due to gravitational acceleration and are not independent of direction.

Application in the Brinell-range on heavy coarse grained castings and forgings. The indicated value is automatically replaced with the next test impact result. Verification of Apparatus 7. When replacement parts are used in a Leeb hardness tester it is important that they be fully compatible with the original equipment.

Coarse finishes will tend to lower the measured value.

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Last previous edition approved in as A — Failure to provide adequate surface finish will produce questionable test results. Finally extrapolation takes places at the required impact time. With microprocessor controlled instruments. No conversions shall be employed without specific agreement between the party specifying this test method and the party performing the hardness test.

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The impact device, while not in contact with the test piece, is held firmly with one hand and the charging tube is depressed with the other hand aetm contact is felt. These are the D. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine ashm applicability of regulatory limitations prior to use. The complete reproduction law is obtained by interpolation between these curve points so that the corresponding amplitude value u t1 can be allocated to each voltage value u t0 enabling the velocity ratio except at the zero positions themselves to be calculated.

L5 Rebound Velocity 3 Impact Velocity 1.

ASTM A956-12

For the definition of some of the parameters refer to Fig. Applications on surface hardened components. The Leeb hardness value is read on the indicator device. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. As opposed to this. To do this, the rebound values are measured, as described above, on two hardness reference blocks having different, known hardness values.

Applications for measurement in the high end range, for example, on steel and cast steel, stainless steel, cold work tool steel with carbide inclusions and on rolls in the hardness range up to HV. The ratio of the rebound velocity to the impact velocity of the impact body is a measure of the hardness of the material under test. Summary of Test Method 4.