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Rockwell Hardness Testings |
In opposite to the other
two testing methods (Brinell,
Vickers) the hardness is
not calculated with the quotient of test load and area of
the impression but directly defined with the deepness of penetration
into the workpiece.
After a pre-penetration of a conical penetrator,
composed of diamond, into the surface of the work piece the
actual testing starts. With a higher test load the penetrator
is pressed into the work piece for a predetermined time. The
remaining depth (tb) that was not reached during the predetermined
time, represents the hardness inversely proportional to the
depth of penetration:
HRc = 100 – 500 x tb
On HRc-hardness testers the penetration
depth and hardness value is displayed immediately after the
test.
Advantages and Disadvantages
Immediate displaying of the hardness value - only for hard
materials.
Applicable for:
Hardened steels and alloys, hard metals.
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