Abstract
The fatigue behavior of low-carbon steel made by wire and arc additive manufacturing (WAAM) is studied. The role of the microstructures underpins the difference in fatigue performance between WAAM and hot-rolled materials is investigated using scanning electron microscopy (SEM), optical metallography, and in-situ acoustic emission. Results show the WAAM low-carbon steel has a lower fatigue crack growth rate (FCGR) comparing with the hot-rolled steel. The mechanisms enhancing the fatigue performance are a lower volume fraction of pearlite and the interlocking basket weave microstructure in WAAM specimens. The anisotropy in the FCGR of WAAM low-carbon steel is very small.
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