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Keménység vizsgálók

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Keménység vizsgálók - feltöltés alatt

Általános áttekintő
•Hardness is resistance of material to plastic deformation caused by indentation.
•Sometimes hardness refers to resistance of material to scratching or abrasion.
•In some cases relatively quick and simple hardness test may substitute tensile test.
•Hardness may be measured from a small sample of material without destroying it.
•There are hardness methods, allowing to measure hardness onsite.
•Principle of any hardness test method is forcing an indenter into the sample surface followed by measuring dimensions of the indentation (depth or actual surface area of the indentation).
A keménységvizsgálás előnyei
•May be applied to the samples of various dimensions and shapes
•May be performed in-situ
Macro and Micro Hardness
•Depending on the loading force value and the indentation dimensions, hardness is defined as a macro- , micro- or nano-hardness.
•Macro-hardness tests (Rockwell, Brinell, Vickers) are the most widely used methods for rapid routine hardness measurements. The indenting forces in macro-hardness tests are in the range of 50N to 30000N.
•Micro-hardness tests (micro-Vickers, Knoop) is applicable when hardness of coatings, surface hardness, or hardness of different phases in the multi-phase material is measured. Small diamond pyramid is used as indenter loaded with a small force of 10 to 1000gf.
•Nano-hardness test uses minor loads of about 1 nano-Newton followed by precise measuring depth of indentation.
Main methods
•Brinell Hardness Test
•Rockwell Hardness Test
•Rockwell Superficial Hardness Test
•Vickers Hardness Test
•Knoop Hardness Test
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