Influence of Cold Rotary Swaging on Microstructure and Uniaxial Mechanical Behavior in Alloy 718

Abstract In this study, the influence of cold rotary swaging on microstructure and mechanical properties precipitation-strengthened nickel-based superalloy 718 (Alloy 718) was investigated. The initial stages work-hardening were characterized by means microhardness, electron backscatter diffraction (EBSD), X-ray (XRD) analyses. Furthermore, attention devoted to behavior at ambient elevated temperature (550 °C) in uniaxial tension compression. Rotary different true strains maximum $$\varphi = 0.91$$ φ = 0.91 caused a moderate increase microhardness enhanced markedly load-bearing capacity tension, giving rise yield strength beyond 2000 MPa. $$R_{p0.2}$$ R p 0.2 subsequent perfectly correlates with increasing dislocation density $$\rho $$ ρ estimated from XRD form Taylor-like relationship $$R_{p0.2} \propto \sqrt{\rho }$$ ∝ . compression, transient stress–strain evolution without occurrence clear elastic range distinct phenomenon observed. Restoration range, accompanied pronounced obtained post-swaging tempering treatment 600 °C.