Abstract
The article deals with the features of deformation and destruction of samples that have undergone chemical-thermal treatment, using the example of testing nitrided samples of steels 38H2MYuA and 30H3MA. It is established that the mechanical properties determined during the tensile testing of samples with a highly rigid brittle layer cannot serve as design characteristics when evaluating the bearing capacity of parts that have undergone chemical-thermal treatment. Testing of nitrided samples of 38H2MYuA and 30H3MA steels demonstrated a complex process of their deformation and destruction, and the test result showed that this steel treated to the «hardened + high tempering» mode sensitivity to the most dangerous concentration the crack is absent.
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