| Abstract Scope |
This study investigates the microstructure and mechanical properties of dense blocks fabricated using wire-arc directed energy deposition (DED) using four different steel feedstock wire compositions (MIL-100S-1, ER120S-1, ER140S-1, and Fe-10Ni) and compares them to conventionally manufactured HY-80 and HY-100 parts. Characterization of the samples was conducted via thermodynamic modeling, optical microscopy, scanning electron microscopy, nanoindentation mapping, Vickers hardness testing, Charpy impact testing, and profilometry-based indentation plastometry. This study also begins investigating the effect of interpass temperature on the microstructure, tensile properties and impact toughness of ER120S-1. MIL-100S-1, ER120S-1, and ER140S-1 phase fractions were successfully predicted using thermodynamic modeling and ER120S-1, ER140S-1, and Fe-10Ni all showed similar or superior hardness and mechanical performance when compared to wrought HY-80. The results indicate that wire-arc DED can be a useful replacement to conventional techniques for the manufacturing of HY steel parts. |