Abstract
Inconel718 superalloy components were fabricated by a modified wire and arc additive manufacturing method which named ultra-high frequency pulsed gas tungsten arc welding (UHFP-GTAW) and conventional pulsed gas tungsten arc welding (CP-GTAW), respectively. The UHFP-GTAW and CP-GTAW components were both divided into two sets of specimens, and one of the two sets was prepared with solution and aging heat treatment, then the microstructure and mechanical properties were investigated. Results showed that the ultra-high frequency pulsed arc could effectively refine the morphology of precipitation strengthening phases and the grain size of matrix. The amount of Laves phase in UHFP-GTAW specimens was apparently reduced compared with CP-GTAW specimens. The reduction of area and elongation of UHFP-GTAW specimens got significantly enhanced while the tensile strength was just slightly decreased.
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