Abstract Scope |
Haynes 282 (H282) is a nickel-based superalloy suitable for additive manufacturing (AM). The selective laser melting (SLM) process, also known as laser powder bed fusion (LPBF), utilizes a laser beam to melt a particular region in a metal powder bed layer-by-layer to produce desired 3D structure. In this process, overhanging regions of the desired structure are built directly on powder, unlike the other regions built on a pre-solidified part. The difference in thermal conductivity of powder versus solid brings about the differences in thermal profile and hence the differences in microstructures. In this research, surface roughness, porosity distribution, and average grain size will be compared between various geometries fabricated by the SLM process. This research will contribute to the understanding of quality control of H282 built by the SLM process and provide further opportunities to control microstructures and improve the mechanical properties of AM parts. |