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Micropitting occurs on
surface-hardened gears and is characterized by extremely
small pits approximately 10 µm (400 µ-inches) deep.
Micropitted metal has a frosted or a gray appearance. This
condition generally appears on rough surfaces and is
exacerbated by use of low-viscosity lubricants. Slow-speed
gears are also prone to micropitting due to thin lubricant
films. Micropitting may be sporadic and may stop when good
lubrication conditions are restored following run-in.
Maintaining adequate lubricant film thickness is the most
important factor influencing the formation of micropitting.
Higher-speed operation and smooth gear tooth surfaces also
hinder formation of micropitting. The following guidelines
should be observed to reduce the onset of micropitting in
gear units:
-
Use gears with smooth tooth surfaces
produced by careful grinding or honing.
-
Use the correct amount of cool, clean,
and dry lubricant with the highest viscosity permissible
for the application.
-
Use high speeds, if possible.
-
Use carburized steel with proper carbon
content in the surface layers.
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