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تاريخ : سه‌شنبه ٩ فروردین ۱۳۸٤


Vickers Hardness Tester

Description

The Vickers hardness test uses a square-based pyramid diamond indenter with an angle of 136º between the opposite faces at the vertex, which is pressed into the surface of the test piece using a prescribed force, F. The time for the initial application of the force is 2 s to 8 s, and the test force is maintained for 10 s to 15 s. After the force has been removed, the diagonal lengths of the indentation are measured and the arithmetic mean, d, is calculated. The Vickers hardness number, HV, is given by:

HV = Constant × Test force / Surface area of indentation

Standard Vickers Scales

 Micro-hardness
scales
 
 Test force
F (N)
 Low-force
hardness scales
 Test force
F (N)
  Macro-hardness
scales
 
 Test force
F (N)
HV 0.010.09807 HV 0.21.961 HV 549.03
HV 0.0150.1471 HV 0.32.942 HV 1098.07
HV 0.020.1961 HV 0.54.903 HV 20196.1
HV 0.0250.2452 HV 19.807 HV 30294.2
HV 0.050.4903 HV 219.61 HV 50490.3
HV 0.10.9807 HV 329.42 HV 100980.7

Standards

BS EN ISO 6507-1:1998,
(BS 427:Part 1:1961)
Metallic materials. Vickers hardness test. Test method
ASTM E92-82(1997)e3Standard Test Method for Vickers Hardness of Metallic Materials

                                             

ارسال توسط محسن حیدری
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