Processing of Ti-5553 with improved mechanical properties via an in-situ heat treatment combining selective laser melting and substrate plate heating

Schwab, H.; Bönisch, Matthias; Giebeler, Lars; Gustmann, Tobias; Eckert, J.; Kühn, U.

doi:10.1016/j.matdes.2017.05.010

Cited by 76 publications

(20 citation statements)

References 39 publications

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“…Although the measurements showed that optimal hardness values were attainable, further tensile testing revealed significantly lower strength and elongation than control specimens due to the presence elongated cracks. In another study, Schwab et al [172] used a similar in-situ heating method to enhance the properties of Ti-5553 during PBF-L through substrate heating. About a 60% increase in Vickers hardness was achieved and higher compressive strength was measured when comparing the heat-treated deposit to the samples with no substrate heating.…”

Section: Effects Of Microstructurementioning

confidence: 99%

The Hardness of Additively Manufactured Alloys

2018

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The rapidly evolving field of additive manufacturing requires a periodic assessment of the progress made in understanding the properties of metallic components. Although extensive research has been undertaken by many investigators, the data on properties such as hardness from individual publications are often fragmented. When these published data are critically reviewed, several important insights that cannot be obtained from individual papers become apparent. We examine the role of cooling rate, microstructure, alloy composition and post process heat treatment on the hardness of additively manufactured aluminum, nickel, titanium and iron base components. Hardness data for steels and aluminum alloys processed by additive manufacturing and welding are compared to understand the relative roles of manufacturing processes. Furthermore, the findings are useful to determine if a target hardness is easily attainable either by adjusting AM process variables or through appropriate alloy selection.

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Section: Effects Of Microstructurementioning

confidence: 99%

The Hardness of Additively Manufactured Alloys

2018

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“…The pillars were conventionally separated from the baseplate and used for the evaluation of the geometric/dimensional impact on microstructure evolution. The build platform (in-house development of Leibniz IFW [32], see Figure 1 for details) was heated to 500 • C before processing. A laser power of 200 W, scan speed of 680 mm s −1 , hatch distance of 0.12 mm, and a layer thickness of 30 µm, were employed for sample processing (stripe scanning, −90 • scan vector rotation).…”

Section: Methodsmentioning

confidence: 99%

Laser Powder Bed Fusion Processing of Fe-Mn-Al-Ni Shape Memory Alloy—On the Effect of Elevated Platform Temperatures

Ewald

Brenne

Gustmann

et al. 2021

Metals

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In order to overcome constraints related to crack formation during additive processing (laser powder bed fusion, L-BPF) of Fe-Mn-Al-Ni, the potential of high-temperature L-PBF processing was investigated in the present study. The effect of the process parameters on crack formation, grain structure, and phase distribution in the as-built condition, as well as in the course of cyclic heat treatment was examined by microstructural analysis. Optimized processing parameters were applied to fabricate cylindrical samples featuring a crack-free and columnar grained microstructure. In the course of cyclic heat treatment, abnormal grain growth (AGG) sets in, eventually promoting the evolution of a bamboo like microstructure. Testing under tensile load revealed a well-defined stress plateau and reversible strains of up to 4%.

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“…In situ heat treatment was also introduced for fabrication of Ti-5553 using SLM. This heat treatment promoted the formation of finely dispersed α-phase plates [85]. Polozov et al [86] studied the effect of preheating on laser processing of orthorhombic Ti alloys.…”

Section: Laser-processed Ti Alloysmentioning

confidence: 99%

“…Many different heat treatments were investigated in the reviewed literature, where it was generally found that post-SLM heat treating reduced the yield and ultimate stresses of parts [74,90], improved fracture toughness and high cycle fatigue crack growth resistance [75,84,90], and decreased porosity from the re-melting and redistribution of material [83]. The tensile strength of SLM-built Ti-5553 was improved using in situ heat treatment as a result of formation of fine α-phase plates [85]. In a study carried out by Igor Polozov et al [86], the highest microhardness and the highest tensile strength values were obtained using 700 • C and 980 • C substrate preheating temperature, respectively.…”

Section: Laser-processed Ti Alloysmentioning

confidence: 99%

“…Pauly et al [412] found that among three different scanning strategies, namely fill-line scans, chess-board scans, and unidirectional scans, the chess-board scan resulted in higher porosity, while unidirectional scans led to the lowest degree of porosity. In another attempt, Li et al [400], successfully fabricated Al 85 Ni 5 Y 6 Co 2 Fe 2 BMGs without cracks by using a high power initial scan followed by a lower power re-scan. The re-scanning can reduce crack formation due to release of initial residual stress through superplasticity formation, as well as decrease the thermal stress result from lowered temperature gradient.…”

Section: Microstructural Characterization and Part Quality Of Powder Bed Fusion Additive Manufactured Bmgsmentioning

confidence: 99%

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Review of Powder Bed Fusion Additive Manufacturing for Metals

Ladani

Sadeghilaridjani

2021

Metals

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Additive manufacturing (AM) as a disruptive technology has received much attention in recent years. In practice, however, much effort is focused on the AM of polymers. It is comparatively more expensive and more challenging to additively manufacture metallic parts due to their high temperature, the cost of producing powders, and capital outlays for metal additive manufacturing equipment. The main technology currently used by numerous companies in the aerospace and biomedical sectors to fabricate metallic parts is powder bed technology, in which either electron or laser beams are used to melt and fuse the powder particles line by line to make a three-dimensional part. Since this technology is new and also sought by manufacturers, many scientific questions have arisen that need to be answered. This manuscript gives an introduction to the technology and common materials and applications. Furthermore, the microstructure and quality of parts made using powder bed technology for several materials that are commonly fabricated using this technology are reviewed and the effects of several process parameters investigated in the literature are examined. New advances in fabricating highly conductive metals such as copper and aluminum are discussed and potential for future improvements is explored.

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Processing of Ti-5553 with improved mechanical properties via an in-situ heat treatment combining selective laser melting and substrate plate heating

Cited by 76 publications

References 39 publications

The Hardness of Additively Manufactured Alloys

The Hardness of Additively Manufactured Alloys

Laser Powder Bed Fusion Processing of Fe-Mn-Al-Ni Shape Memory Alloy—On the Effect of Elevated Platform Temperatures

Review of Powder Bed Fusion Additive Manufacturing for Metals

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