A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samples

Pant, Prabhat; Salvemini, Filomena; Proper, Sebastian; Luzin, Vladimir; Simonsson, Kjell; Sjöström, Sören; Hosseini, Seyed; Peng, Ru Lin; Moverare, Johan

doi:10.1016/j.matdes.2022.110386

Cited by 54 publications

(14 citation statements)

References 44 publications

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“…The described microstructure in the etched micrographs and the EBSDmeasurements is consistent with observations from other publications [18][19][20]. The fracture surfaces of a vertical and horizontal SL tensile bar are shown in Fig.…”

Section: Synchrotronsupporting

confidence: 90%

Comparison of different multi-laser powder bed fusion exposure strategies and their influence on the part quality of IN718

Pfalz,

Rota,

Saeidnezhad

et al. 2023

Int J Adv Manuf Technol

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Multi-laser powder bed fusion (M-LPBF) systems, characterized by large building envelopes and multiple lasers, have become increasingly prevalent in industrial additive manufacturing. The increased build rate of these machines relative to single laser systems offers the potential to drastically reduce the cost per part. However, one major challenge with M-LPBF is that often multiple lasers are needed to build a single part. Therefore, the exposure area must be divided, and the segments must be assigned to different lasers. Various strategies for splitting the exposure area are available, but their influence on part quality remains yet to be determined.This study aims to investigate the impact of the fixed exposure border, variable exposure border, and segmented stripes M-LPBF exposure strategy on the part quality of samples built with two lasers compared to samples built with one laser. Therefore, the porosity, microstructure, and mechanical properties of IN718 samples were evaluated. The research shows that the fixed exposure border strategy resulted in a localized increase in porosity at the border or within the overlap area between segmented exposure areas, as well as grain coarsening and increased texture within the remelted areas. The variable exposure strategy also resulted in a higher porosity level, but the microstructure was more like the single laser reference sample. These changes resulted in a minor decrease in mechanical properties. The segmented stripes strategy exhibited a similar microstructure and mechanical properties to the single laser reference, making it the most suitable approach for M-LPBF in industrial applications.

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Section: Synchrotronsupporting

confidence: 90%

Comparison of different multi-laser powder bed fusion exposure strategies and their influence on the part quality of IN718

Pfalz,

Rota,

Saeidnezhad

et al. 2023

Int J Adv Manuf Technol

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“…Therefore, although the initiation of mechanisms is not limited, growth may be constrained. These results confirm the difference in behavior between Z1 and Z2 for both specimens, probably due to the variability in LPBF material, especially near the surface [55].…”

Section: Microstructure Evolutionsupporting

confidence: 83%

Self-Heating and Fatigue Assessment of Laser Powder Bed Fusion NiTi Alloy with High Cycle Fatigue Mechanisms Identification

Cullaz,

Saint-Sulpice,

Elahinia

et al. 2024

Metals

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Rapid methods for assessing the fatigue properties of materials have been developed, among which the self-heating method stands out as particularly promising. This approach analyzes the thermal signal of the specimen when subjected to cyclic loading. In this research, the self-heating method was utilized for the first time with laser powder bed fusion (LPBF) of NiTi alloys, examining two specific loading conditions: loading ratios of 0.1 and 10. A thorough examination of the material self-heating behavior was conducted. For comparative purposes, conventional fatigue tests were also conducted, alongside interrupted fatigue tests designed to highlight the underlying mechanisms involved in high cycle fatigue and potentially self-heating behavior. The investigation revealed several key mechanisms at play, including intra-grain misorientation, the emergence and growth of persistent slip bands, and the formation of stress-induced martensite. These findings not only deepen our understanding of the fatigue behavior of LPBF NiTi alloys but also highlight the self-heating method potential as a tool for studying material fatigue.

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“…LPBF offers several advantages over traditional manufacturing techniques. It can produce complex geometries with high precision and material efficiency [21][22][23]. The technology allows for rapid prototyping and customization, reducing lead times and tooling-related costs.…”

Section: Advantages and Limitationsmentioning

confidence: 99%

Laser Powder Bed Fusion: Exploring Recent Technological Breakthroughs and Alloy Utilization

Hedric

2024

Preprint

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Laser Powder Bed Fusion (LPBF), as a transformative technology in the field of additive manufacturing, offers unprecedented design flexibility and material efficiency. This review paper delves into the latest advancements in LPBF technology and the various alloys used in the process, including titanium alloys, aluminum alloys, nickel-based superalloys, steel alloys, copper alloys, and high-entropy alloys. For each alloy category, we discuss their specific applications, performance characteristics, and challenges faced in LPBF usage. The paper discusses important technological breakthroughs, including innovations in laser systems, scanning strategies, and in-situ monitoring technologies, which have enhanced the precision and reliability of LPBF.

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A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samples

Cited by 54 publications

References 44 publications

Comparison of different multi-laser powder bed fusion exposure strategies and their influence on the part quality of IN718

Comparison of different multi-laser powder bed fusion exposure strategies and their influence on the part quality of IN718

Self-Heating and Fatigue Assessment of Laser Powder Bed Fusion NiTi Alloy with High Cycle Fatigue Mechanisms Identification

Laser Powder Bed Fusion: Exploring Recent Technological Breakthroughs and Alloy Utilization

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