Microstructure and Mechanical Properties of Low-Activation V–4Ti–4Cr–(C, O, N) Vanadium Alloys Depending on Conditions of Their Technological and Thermomechanical Treatment

The results of investigations of the effect of thermomechanical treatment (TMT) regimes on the regularities of phase transformations, microstructure, and mechanical properties of low-activation alloys of the V–4Ti–4Cr–(C, O, N) system are summarized. The mechanisms of these transformations and the relationship between the microstructure and the level of strength and plasticity are established. The TMT regimes are presented that provide a uniform bulk distribution of nanosized particles of stable oxycarbonitride, a significant increase in their density (dispersion), and an increase in the thermal stability of the microstructure. It is shown that these regimes lead to a significant (by 30–60%) increase in the short-term strength of alloys in a wide (from 293 to 1073 K) temperature range with preservation of a sufficiently high plasticity.