Effect of Thermomechanical Treatment Modes on Structural-Phase States and Mechanical Properties of Metastable Austenitic Steel

摘要

The features of the structural-phase states and mechanical properties of metastable austenitic steel after thermomechanical treatments have been investigated. It is shown that low-temperature and subsequent deformation in the temperature range 300-773 K contributes to the direct (y → a')-martensitic transformation. The combination of low-temperature, subsequent warm deformation at 873 K and annealing at 1073 K leads to the direct (y → a')- and reverse (a' → y)-martensitic transformations. As a result of thermomechanical treatments submicrocrystalline two-phase structural states with high strength properties (σ_(0.1) ≈1160-1350 MPa) are formed.