Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 112, Issue 1-2, Pages 175-192Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-020-06346-y
Keywords
Selective laser melting; Additive manufacturing; AA2024; Process parameters; Mechanical properties; Microstructure
Funding
- ministry of national education of Turkey
- ASTUTE 2020 (Advanced Sustainable Manufacturing Technologies)
- European Regional Development Fund through theWelsh Government
Ask authors/readers for more resources
Selective laser melting (SLM) offers significant benefits compared to traditional manufacturing techniques, but the limited materials available for SLM production restrict the industrial adoption of the technology. This study investigates the effect of laser parameters on the mechanical and microstructural properties of aluminium 2024 alloy manufactured using SLM, revealing insights into crack formation and microhardness variations.
Selective laser melting (SLM) offers significant benefits, including geometric freedom and rapid production, when compared with traditional manufacturing techniques. However, the materials available for SLM production remain limited, restricting the industrial adoption of the technology. The mechanical properties and microstructure of many aluminium alloys have not been fully explored, as their manufacturability using SLM is extremely challenging. This study investigates the effect of laser power, hatch spacing and scanning speed on the mechanical and microstructural properties of as-fabricated aluminium 2024 alloy (AA2024) manufactured using SLM. The results reveal that almost crack-free structures with high relative density (99.9%) and Archimedes density (99.7%) have been achieved. It is shown that when using low energy density (ED) levels, large cracks and porosities are a major problem, owing to incomplete fusion; however, small gas pores are prevalent at high-energy densities due to the dissolved gas particles in the melt pool. An inversely proportional relationship between ED and microhardness has also been observed. Lower ED decreases the melt pool size and temperature gradients but increases the cooling rate, creating a fine-grained microstructure, which restricts dislocation movement, therefore increasing the microhardness. The highest microhardness (116 HV0.2), which was obtained from one of the lowest EDs used (100 J/mm(3)), is 45% higher than as-cast AA2024-0, but 17% lower than wrought AA2024-T6 alloy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available