Phase transformations in heat resisting nickel alloy ZhS6U after fatigue testing

The phase transformations and alloying element distribution between the phases in the ZhS6U alloy weakened in the process of fatigue testing are investigated. It is shown by the methods of physico-chemical phase analysis and electron microscopy that stresses acting at working temperatures contribute to the coagulation of γ'-phase, raise its chemical heterogeneity and contribute to the decay into γ1 and γ2 fractions, the latter differing in their composition and structural stability. The γ1 to γ2 fraction relationship directly depends on high-temperature testing duration and alloy strength level