Abstract
Wire arc additive manufacturing (WAAM) is suitable to fabricate large components because of its high deposition rate. In this study, a metal-cored low-alloy high-strength welding filler metal was used as feedstock. Single wall structures were prepared using the WAAM process with different interpass temperatures (150 °C, 350 °C, and 600 °C). No obvious microstructure change was observed when the alloy was deposited with the interpass temperatures of 150 °C and 350 °C. Electron backscattered diffraction analysis shows that that no significant texture is developed in the samples. The yield strength tends to decrease with the increase in interpass temperature; however, the influence is insignificant. The highest ultimate tensile strength is found at the interpass temperature of 350 °C. A higher interpass temperature can lead to a higher deposition rate because of the shorter waiting time for the cooling of the earlier deposited layer. It was found that the upper limit interpass temperature for WAAM of the low-alloy high-strength steel is 350 °C. When a higher interpass temperature of 600 °C was used, collapse of the deposited materials was observed.
Highlights
Additive manufacturing (AM) has gained tremendous attention in industry and academia due to its advantages over conventional subtractive manufacturing processes in terms of its complex geometry and near net shape fabrication
Fusion-based AM is one of the most popular techniques applied in engineering applications, including selective laser melting (SLM) [1,2], electron beam melting (EBM) [3], laser metal deposition (LMD), [4,5]
We report the results of our study of wire arc additive manufacturing (WAAM) using this filler wire, with special attention paid to the effect of interpass temperature (150 ◦ C, 350 ◦ C, and 600 ◦ C) on microstructures, mechanical properties of the deposited metals, and the formability
Summary
Additive manufacturing (AM) has gained tremendous attention in industry and academia due to its advantages over conventional subtractive manufacturing processes in terms of its complex geometry and near net shape fabrication. Wire arc additive manufacturing (WAAM) [6,7]. Among these AM processes, WAAM is a variation of a direct energy deposition technology using cost efficient production resources. It is transformed from an arc welding technology to build components in a layer-by-layer strategy [8,9,10]. Powder-bed AM processes possess high fabrication accuracy due to the small melt pool size [11,12], the drawback is their low deposition rate. The deposition rate is about 40–100 g per hour for SLM, 100–300 g per hour for EBM and
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