Recent Advances in Metal Powder-Based Additive Manufacturing

Summary: Through laser powder bed fusion, we have successfully printed dual-phase nanolamellar high-entropy alloys with high yield strength and large uniform elongation. The high yield strength is attributed to the dual-phase structure consisting of alternating face-centred cubic and body-centred cubic nanolamellae, while the large tensile ductility arises from the high work-hardening capability of the dual-phase nanolamellae embedded in microscale eutectic colonies.

Summary: This article provides a translation of a review on the recent developments in laser powder bed fusion (LPBF) technique, focusing on process parameters, defects, microstructure evolution, metallurgical phenomena, and microselective laser melting processing. It discusses the impact of powder-related and laser-related properties on LPBF process, describes the types, formation mechanisms, and suppression strategies of metallurgical defects in LPBF products, and introduces the microselective laser melting processing for miniaturized part production.

Summary: The effect of volumetric energy density (VED) on the fabrication of AlSi10Mg alloy by selective laser melting (SLM) was investigated, revealing different melting modes and resulting in varied microstructural evolution and mechanical properties. Higher VED led to the formation of keyhole defects and two types of molten pools, affecting the grain size, Si network, and mechanical properties of the SLM parts differently.