RAMT

Authors

Elena G. Astafurova ¹ , Evgenii V. Melnikov ¹ , Sergey V. Astafurov ¹

¹ Laboratory of Physics of Hierarchical Structures in Metals and Alloys, Institute of Strength Physics and Materials Science SB RAS, 2/4 Akademicheskii prospekt, 634055, Tomsk, Russia

10.17586/2687-0568-2024-6-3-120-131

Rev. Adv. Mater. Technol., 2024, vol. 6, no. 3, pp. 120–131

Abstract

In this paper, we study the effect of hydrogen pre-charging (in a 1N H2SO4 solution with a CS(NH2)2 as a recombination potion, at current densities of 10, 100 and 200 mA/cm2, for 5 hours) on the microstructure and phase composition of a type AISI 321 austenitic stainless steel during room-temperature rolling. Hydrogen pre-charging enhances the contribution of mechanical twinning to the fragmentation of the structure and assists to γ→α' and γ→ε transformations during rolling. Both, twinning and martensitic transformations, are dependent on hydrogen pre-charging regime: an increase in a current density during pre-charging of the specimens causes a decrease in the thickness of twin plates, increases the density of twin boundaries and fraction of α'-martensite in the structure of the rolled specimens. The formation of a high density of Σ3n boundaries (twin and εmartensite) prevents the formation of a misoriented grain structure in austenite during rolling of steel specimens. Hydrogen pre-charging provides faster kinetics of γ→α' phase transformation in metastable steel AISI 321 during rolling.

Keywords

Austenitic stainless steel; Hydrogen; Twinning; Martensitic transformation; Microstructure

Foundings

Government research assignment for ISPMS SB RAS: FWRW-2022-0005

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Hydrogen-Enhanced Martensitic Transformation and Twinning under Rolling of AISI 321 Austenitic Stainless Steel

Authors

Abstract

Keywords

Foundings