Grain structure and mechanical properties of high-nitrogen austenitic steel VNS-53‑SH after warm multidirectional isothermal forging

The effect of warm multidirectional isothermal forging on the grain structure and mechanical properties of a high-nitrogen austenitic steel is investigated. It is shown that after forging the average grain size is reduced to ≈6 μm compared to the initial state. This is due to the formation of fine grains at the original grain boundaries followed by their fragmentation. Under deformation, the steel grain structure significantly changes, with numerous low-angle misorientation boundaries being formed. The density of dislocations increases and a large number of dislocation substructures are formed. It is demonstrated that the yield strength at room temperature increases 2.5 times and reaches ≈1300 MPa, with elongation to failure decreasing down to ≈10 %.

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1. Government Research Assignment for the Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences - FWRW-2021-0008