Wire arc additive manufacturing of a high strength steel

• Main Author: Guo, Bing
• Other Authors: Zhou Wei
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2022
• Subjects: Engineering::Mechanical engineering
• Online Access: https://hdl.handle.net/10356/159046
• Institution: Nanyang Technological University

Due to the high deposition rates of wire arc additive manufacturing (WAAM) process, it allows quick manufacture of massive structural components. In this study, WAAM process is utilised to prepare three different samples at 150°C, 350°C and 600°C interpass temperatures, using a high strength low alloy (HSLA) steel metal-cored wire as a feedstock. Cold metal transfer (CMT) will be the main welding process used to produce the sample. Following the fabrication of the sample, sample preparation steps including cutting, mounting, grinding, polishing, etching, and cleaning are performed. Following that, the samples were examined in more detail using the optical microscope and scanning electron microscope. Vickers hardness and tensile tests are performed to evaluate the mechanical properties of the samples. The interpass temperature seem to have a substantial influence on the formability of the deposited material but not on its microstructure or mechanical strength. One of the more significant effects will be the increase in grain sizes as interpass temperature increases. Additionally, the sample fabricated with the interpass temperature of 150°C seems to be more ductile and have the highest yield strength.