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on steels with different structures is different. Blisters were created and the roughness
increased on the surfaces of studied steels, however the blister sizes, their density and
dynamics of changes were different for each material. Information on the time changes of
the steel surfaces with different structures after the action of hydrogen on them is necessary
to develop recommendations for materials to produce friction pairs and appropriate
lubricants, as well as to predict the service life of structural elements operating in working
environments.
In order to predict the surface roughness parameters of titanium alloy details after
their chemical-thermal treatment (nitriding and boriding), the influence of these
technological processes on the change in roughness was studied. In particular, for titanium
ВТ 1-0 it was found that the level of initial roughness and the temperature of the
technological process also influenced on the change in roughness. The surface roughness
of details before and after technological processes was estimated by non-contact method.
It is established that the surface roughness after chemical-heat treatment increases on
average by two classes.
Key words: phase-shifting interferometry, surface relief, surface roughness, fatigue
process zone, fatigue crack, blisters.
