|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications III
||Additive Manufacturing of Zr-modified Aluminum Alloy 6061 by Laser-powder Bed Fusion
||Abhishek Mehta, Le Zhou, Holden Hyer, Thinh Huynh, Sharon Park, Devin D Imholte, Nicolas E Woolstenhulme, Daniel M Wachs, Yongho Sohn
|On-Site Speaker (Planned)
Minor addition of Zr grain refiner has been documented to suppress the hot cracking tendency of the commercial aluminum alloys in laser powder bed fusion (LPBF) additive manufacturing. In this work, printability/buildability of commercial AA6061 and modified AA6061 with 1 wt.% Zr was examined as functions of laser power (200 – 350 W) and scan speed (100 – 1800 mm/s) using gas atomized alloy powders. Cracking observed in LPBF AA6061 disappeared with the addition of Zr, and AA6061+Zr samples with density greater than 99.9% was obtained at optimum LPBF parameters identified. Mechanical properties of the dense, Zr-modified AA6061 specimens were measured for as-built specimens, and after traditional two-step T6 and modified three-step T6 heat treatment. Underlying mechanisms in buildability, enhanced hardness, strength and ductility will be presented and discussed with respect to those of conventionally manufactured and heat treated AA6061.