It is known, that cold plastic deformation leads to increase durability
properties and to increase in plastic properties. It occurs as a result
of braking sliding dispositions.
However at small degrees of deformation , and also at sign-variable deformation
reduction durability and increase in plastic characteristics is observed, that is
processes antihardening proceed. Thus visible changes in structure do not occur.
Mine masters work is directed on studying of processes decrease in durability at cold
deformation and an establishment of the reasons of downturn of durability.