High temperature tensile properties and deformation behavior of the GW103K alloy fabricated by laser coaxial wire additive manufacturing

The GW103K alloy was successfully fabricated by laser coaxial wire additive manufacturing, and its high temperature tensile properties and deformation behavior were investigated at 200–300 °C. The results demonstrate that this alloy exhibits an excellent balance between elevated-temperature strength and ductility. At 250 °C, the alloy still maintains a relatively high tensile strength of 302 ± 7 MPa together with an outstanding elongation of 19.4 ± 2.9%. At temperatures below 250 °C, the deformation behavior is mainly dominated by intragranular slip accompanied by a limited amount of continuous dynamic recrystallization (CDRX). In contrast, at 300 °C, grain boundary sliding becomes the dominant deformation mode, and the recrystallization mechanism evolves from CDRX to a mixed CDRX + discontinuous dynamic recrystallization (DDRX) mechanism.