Post-treatment of additively manufactured Fe–Cr–Ni stainless steels by high pressure torsion: TRIP effect

High pressure torsion (HPT) at room temperature was used for post-treatment of additively manufactured Fe–Cr–Ni stainless steel with 12.9 wt % Ni as a very strong austenite stabilizer. The results showed that HPT caused considerable increase in nanohardness the samples. In contrast thermodynamic equilibrium-state modeling, phase transformation from FCC to HCP structure occurred, leading formation ε-martensite during on high angle boundaries, low and dislocation cells no detection deformation twins. It demonstrated combination additive manufacturing thanks density dislocations after solidification process expands opportunities both methods control mechanisms steels different microstructural features. Thus, outcome this study provides fundamental basis design advanced structural materials.