GMKOREA EDS-T-7120-2006 METHOD FOR VICKERS HARDNESS TEST (VERSION 3).pdf
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1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology. Standards METHOD FOR VICKERS HARDNESS TEST EDS-T-7120 ISSUED DATE: 1990. 05. 23 REVISED DATE: 2006. 05. 26 VERSION: 3 EDS-T-7120 METHOD FOR VICKERS HARDNESS TEST PAGE: 1/3 ISSUED DATE: 1990. 05. 23 REVISED DATE: 2006. 05. 26 V
2、ERSION: 3 GM DAEWOO Auto & Technology 1. SCOPE This standard specifies the method of vickers hardness test for matallic materials. In this case, this standard shall be applied to the test load ranging from 0.01kgf to 2kgf. 2. DEFINITIONS The vickers hardness value shall be calculated from the follow
3、ing formular and shall be the one left after the load to leave a pyramidal indentation in the test surface with the diamond indenter of the angle between opposite faces of 136is divided by the surface area calculated from the length of the diagonal at indentation. )W14*/“E1E= Hv : Vickers hardness P
4、 : Test load d : Mean length of the diagonals at indentation A : Angle between opposite faces of diamond indenter(136) Fig. 1 Indenter Fig. 2 Size of indentation 3. TEST PIECE 3.1. The test surface of the test piece shall be even in principle. 3.2. The test surface of the test piece shall have no fo
5、reign substances such as oil and oxidized substances on it. EDS-T-7120 METHOD FOR VICKERS HARDNESS TEST PAGE: 2/3 ISSUED DATE: 1990. 05. 23 REVISED DATE: 2006. 05. 26 VERSION: 3 GM DAEWOO Auto & Technology 3.3. The thickness of the test piece shall generally be at least 1.5 times the diagonal length
6、 of indentation. The opposite face of the test material shall not be deformed due to the indentation. 4. TESTER 4.1. The tester to be applied to vickers hardness test shall be proper for ISO 6507 and KS B 5525. 4.2. The tester shall be set up on a sufficiently stable baseplate and shall be worked by
7、 placing the axis of indenter in perpendicular direction. 4.3. When the main parts of the tester are disassembled, rebuilt or reset, the tester shall be used after being reconfirmed for its accuracy according to ISO 6507 and KS B 5525. 4.4. Even when being not relevant to the preceding clause, the t
8、ester shall be confirmed for the adequacy of its accuracy according to ISO 6507 and KS B 5525 at a definite interval, depending on the frequency of testing.4.5. The diamond indenter needs to be exchanged when abnormalities on the main parts such as damages on its front edge or top line are admitted.
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