Pace Technologies OMEGA SRT-15/150, Инструкция по эксплуатации, Страница: 35 / 42

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NSTRUCTION
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ANUAL
3601 E. 34th St. Tucson, AZ 85713 USA Tel. +1 520 - 882 - 6598 Fax +1 520 - 882 - 6599 email: pace@metallographic.com Web: http://www.metallographic.com
Please read this instruction manual carefully and follow all installation, operating and safety guidelines.
OMEGA SRT - 15/150 Dual Superficial /
Rockwell Hardness Tester
MICROHARDNESS
Microhardness testers are both mechanical and optical measuring tools. The indent is
produced by applying a known load to the specimen and then measuring the size of the
appropriate diagonals either optically or with image analysis software.
Microhardness is primarily determined with either a Knoop or Vickers indenter under test
loads in the range of 1 to 2000 gram - force. Microhardness is used to measure the hardness of
specific phases, small particles, and for brittle materials.
Knoop hardness (HK) number is based on the size of the indent that a rhombic - based,
pyramidal diamond indenter produces under a known applied load. The HK number is
calculated by dividing the applied load (kilogram - force) by the projected area of the
indentation (square millimeters).
The Vickers hardness (HV) number is obtained by dividing the applied load in kilogram - force
by the surface area of the indentation. The area of the indentation produced from the Vickers
square - based pyramidal diamond is determined by the mean distance between the two
diagonals of the indentation.
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