Influence of thermomechanical treatment on the shape memory effect and pseudoelasticity behavior of conventional and additive manufactured Fe–Mn–Si–Cr–Ni-(V,C) shape memory alloys

This study evaluated the influence of heat treatment and thermomechanical training on microstructural evolution mechanical characteristics conventional additive-manufactured FeMnSi-based shape memory alloys. The samples were produced by casting rolling. manufactured using laser powder bed fusion (L-PBF) technique. Both specimens subjected to same training. involved solution annealing at 1050 °C for 2 h aging 750 6 h, concluded with a 4% elongation ambient temperature followed 250 15 min. cycle was repeated four times each sample after treatment. improved pseudoelasticity effect samples. Although further enhanced pseudoelasticity, it also reduced effect. Thermomechanical led formation large number stacking faults, which facilitated inverse phase transformation martensite (ε) austenite (γ) during unloading, resulting in pseudoelasticity. heat-treated showed highest total recovery strain owing characteristic could be due smaller grain size higher volume fraction precipitates. precipitates refinement conditions partial dislocation motion increasing back stresses tip.