Mechanical and Tribological Behavior of ER70S-6 Mild Steel Fabricated by MIG Welding-Based Wire Arc Additive Manufacturing
摘要
Wire Arc Additive Manufacturing (WAAM) is an efficient technique for fabricating large-scale steel components; however, limited information is available on the wear behavior of WAAM-fabricated ER70S-6 steels. In the present study, ER70S-6 mild steel wall structures were fabricated using a MIG welding-based WAAM process and systematically characterized for their microstructural, mechanical, hardness, and wear behavior. The Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDX) studies showed that there is a ferrite–pearlite microstructure, dependent on the heat cycling and build orientation. The samples had ultimate tensile strength of 490-540 MPa, yield strength of 330-395 MPa, and elongation of 10-14%, and showed a good strength–ductility ratio. Microhardness values ranged from 134 to 148 HV, indicating local thermal occurrences. Dry sliding wear tests demonstrated that wear rates had a range that was 10−4 mm/Nm, with the horizontal specimens displaying up to 66.7% decrease in specific wear rate and 25% decrease in coefficient of friction at ideal load speed.\query{Please check the edit made in the article title.}