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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These induced voltages are proportional to the respective impact and rebound velocities.
Measurements on steel and cast steel, cold work tool steel and cast aluminium alloys. Failure to provide adequate surface finish will produce questionable test results. Applications on surface hardened components.
ASTM A – 12 Standard Test Method for Leeb Hardness Testing of Steel Products
Each laboratory measured the hardness of each block 25 times. B manually for other directions than vertically down. Same materials to be tested like standard D unit but at extended hardness range. Ast, the L value depends on the geometry of the indenter and its material properties, predominantly hardness and elasticity.
Same materials to be tested like standard D unit but at extended hardness range.
In addition to the hardness. The results obtained are indicative of the strength and dependent on the heat treatment of the material tested. The results must therefore aetm correspondingly corrected. It is of advantage to arrange the impact body magnets and the coil so that the impact signal as xstm as the rebound signal uses at least two zero transitions in this case 3 of the induced voltage as support points for the evaluation of the curve.
After placing the impact device on the test surface, trigger the impact body by exerting a light pressure on the release button. Verification of Apparatus 7. It is recommended that any residual magnetic field be less than 4 G.
We need your help to maintenance this website. Probe S LS -4 -4 -4 -4 -3 -3 -3 -3 -3 -2 -2 -5 -7 -5 -8 -5 -9 -6 -6 -7 -7 -7 -8 -8 -9 asstm.
ast, 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. Calculation of Hardness Result The surfaces to be tested shall be smooth. The distance between the impact point and a specimen edge shall not be less than three diameters edge-to-edge. We need your help!
ASTM A / AM – 17 Standard Test Method for Leeb Hardness Testing of Steel Products
The Leeb hardness number is followed by the symbol HL with one or aastm suffix characters representing the type of impact device. Last previous edition approved in as A — Any instrument not meeting the requirements of Part B shall not be employed for the acceptance testing of product.
Consequently, there is no basis for defining the bias of this test method. Significance and Use 4. Each of the standard probes has its own characteristic direction dependency. Applications on walled or impact sensitive components small measuring indentation too. Device S LS -4 -4 atm -4 -3 -3 -3 -3 -3 -2 -2 -5 -7 -5 -8 -5 -9 -6 -6 -7 -7 -7 -8 -8 -9 Size px x x x x The width of the signal curve has some influence on the result, because it determines, how good the proportionality between mimimum value B and rebound velocity is.
Applications on steel and cast steel. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The quotient of these measured voltage values derived from the aatm and rebound velocities, multiplied by the factor produces a number which constitutes the Leeb hardness value.
They have to be chosen in such a way, that the specified parameters of the induction voltage signal are fulfilled. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.