Microstructure and mechanical properties of low-activation austenitic steel after high-temperature annealing

The effect of high-temperature annealing on the structural-phase states of a new low-activation austenitic steel with high Mn content is studied. It is shown that during annealing for 1–10 hrs at 700°C dispersed particles of M23C6 carbides precipitate in the steel. Under annealing of the solution-treated (ST) steel, these particles precipitate predominantly at the grain boundaries. A longer annealing period of up to 10 hrs leads to an increase in their size and content and a formation of facets at the grain boundaries. Under annealing of the steel in a cold rolled (CR) state, M23C6 particles precipitate predominantly at the boundaries of micro- and nanotwins of deformation. The particles formed at the coherent twin boundaries further grow along the twin boundaries when the annealing time is increased to 10 hrs, forming thin discontinuous precipitates. The lamellar structure consisting of twin / matrix packets under annealing conditions remains stable, while the dislocation density slightly decreases. The precipitation of M23C6 carbides does not significantly affect the steel mechanical properties. The values of yield and tensile strength and elongation to failure both at room and elevated tensile temperatures (650°C) are comparable with the corresponding values before annealing.

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1. The study was funded by a grant of the Russian Science Foundation - 22-19-00802