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Elemental
Thermal
Wet Chemistry
Metallurgical
Organic
Optical
HARDNESS, COATING,
AND DENSITY TESTING
Hardness value is an important
characteristic in the manufacture of
cast components. The high-load Brinell
method is often used on components—
where large indentations enable a stable
average value to obtain metallographic
constituents. The hardness of these me-
tallographic constituents and individual
phasesmaybedeterminedonspecimens
via microhardness testing in accordance
with ASTM B933. As an example of this
type of equipment, Zwick’s Brinell hard-
ness testing machines with automatic
indentation measurement to 29,000 N
are complemented by a comprehensive
micro Vickers instrument range, includ-
ing fully automatic systems.
Powder materials are also used
for coatings to protect substrates from
corrosion, wear, high temperatures, ero-
sion, or abrasion. Coatings are tested
for thickness, adherence, composition,
porosity, hardness, and impact strength.
A metal component mounted and
gripped for fatigue testing in a Vibrophore
system.
Testing of metal components requires specialized fixturing and gripping t echniques.