Interplay of laser power and pore characteristics in selective laser melting of ZK60 magnesium alloys:A study based on in-situ monitoring and image analysis

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外文摘要：This study offers significant insights into the multi-physics phenomena of the SLM process and the subsequent porosity characteristics of ZK60 Magnesium(Mg)alloys.High-speed in-situ monitoring was employed to visualise process signals in real-time,elucidating the dynamics of melt pools and vapour plumes under varying laser power conditions specifically between 40 W and 60 W.Detailed morphological analysis was performed using scanning-electron microscopy(SEM),demonstrating a critical correlation between laser power and pore formation.Lower laser power led to increased pore coverage,whereas a denser structure was observed at higher laser power.This laser power influence on porosi-ty was further confirmed via optical microscopy(OM)conducted on both top and cross-sectional surfaces of the samples.An increase in laser power resulted in a decrease in pore coverage and pore size,potentially leading to a denser printed part of Mg alloy.X-ray computed tomo-graphy(XCT)augmented these findings by providing a 3D volumetric representation of the sample internal structure,revealing an inverse rela-tionship between laser power and overall pore volume.Lower laser power appeared to favour the formation of interconnected pores,while a re-duction in interconnected pores and an increase in isolated pores were observed at higher power.The interplay between melt pool size,vapour plume effects,and laser power was found to significantly influence the resulting porosity,indicating a need for effective management of these factors to optimise the SLM process of Mg alloys.

外文关键词：

Selective laser melting(SLM)Magnesium(Mg)alloysBiodegradable implantsPorosityIn-situ monitoring

作者：

Weijie Xie、Hau-Chung Man、Chi-Wai Chan

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作者单位：

Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hong Kong,China

School of Mechanical and Aerospace Engineering,Queens University,Belfast BT9 5AH,UK

Research Institute for Advanced Manufacturing,The Hong Kong Polytechnic University,Hong Kong,China

基金：

Research Grants Council of the Hong Kong Special Administrative Regioninfrastructure of The Queen's University BelfastHong Kong Polytechnic University and University Research Facility in 3D Printing

项目编号：

152131/18EU3DP

出版年：

2024

DOI：

10.1016/j.jma.2023.11.005

镁合金学报(英文)

ISSN：2213-9567

年,卷(期)：2024.12(4)