Micro Hardness Testing

MES offers micro hardness testing of metals and minerals using Knoop and Vickers scales.

Micro hardness testing of metals, composites and minerals is employed where a superficial hardness test is not possible due to a small sample geometry or area of interest. Micro hardness tests can be used to provide necessary data when measuring individual microstructures within a larger matrix, thin materials, coatings, or when determining the hardness gradient of a specimen along a cross section, such as a weld heat affected zone.

MES utilizes test loads from 10 to 1000 grams using the Knoop or Vickers scales. the Vickers Hardness Test employs a diamond with an apical angle of 136°, and the Knoop Hardness Test uses a narrow rhombus shaped diamond indenter. The test surface usually must be highly polished. The smaller the force applied the higher the metallographic finish required. Microscopes with a magnification of around 500x are required to accurately measure the indentations produced.

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  • Non destructive minus a small indentation
  • Simple and rapid procedure for fast results
  • Converts to all common hardness scales
  • On-site testing of large and/or heavy component or items already installed as parts of a machine
  • Standardized test methods
  • ASTM A956
  • ASTM E18
  • ASTM A833
  • Accessibility to test area
  • Smooth surface finish free of coatings
  • Minimum thickness of 1” for Leeb