Selective laser melting of pure tantalum: Densification, microstructure and mechanical behaviors

Zhou, Libo; Yuan, Tiechui; Li, Ruidi; Tang, Jianzhong; Wang, Guohua; Guo, Kaixuan

doi:10.1016/j.msea.2017.09.083

Cited by 105 publications

(28 citation statements)

References 38 publications

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“…The impurity level in tantalum can have a much higher influence on the mechanical strength compared to the grain size [18,34]. Interstitials hinder the propagation of dislocations, increasing the absolute stress for plastic deformation [34].…”

Section: Tensile Propertiesmentioning

confidence: 99%

“…Different AM studies, in which lasers were used as the heat source and tantalum powder as the feedstock, have already been reported. In particular, a complete study on the Laser-powder-bed-fusion (LPBF) process, microstructure and mechanical properties of tantalum powder has been conducted by Zhou et al [18]. Micro-pores and micro-cracks were found within the build when the laser power was not optimised; both high hardness and high tensile properties were observed after the deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Overview of mechanical properties of pure Ta obtained via different manufacturing routes. Data taken from the comparison reported in the work of Thijs et al[20] and completed with the results from the work of Zhou et al[18]. (*EB: electron beam melted; **P/M: powder metallurgy.…”

mentioning

confidence: 99%

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Microstructure, hardness and mechanical properties of two different unalloyed tantalum wires deposited via wire + arc additive manufacture

Marinelli

Martina

Ganguly

et al. 2019

International Journal of Refractory Metals and Hard Materials

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An innovative way of producing large-scale unalloyed tantalum parts, based on the Wire + Arc Additive Manufacturing process, has been developed in this study. Two different unalloyed tantalum wires have been used to deposit 200-mm-long structures in tantalum. The effect of the wire chemistry on microstructure, hardness, porosity, mechanical properties and strain localisation has been investigated. The deposits showed high integrity and excellent mechanical properties, with yield strength, ultimate tensile strength and elongation as high as 234 MPa, 261 MPa, and 36 %, respectively. Indeed, yield strength was higher than commercially available tantalum, even though, in this study, the grains were large and had a high aspect ratio. Wire + Arc Additive Manufacture has clearly shown the potential to produce tantalum components with relatively low cost and reduced lead time, thus offering a new robust and viable manufacturing route.

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Section: Tensile Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure, hardness and mechanical properties of two different unalloyed tantalum wires deposited via wire + arc additive manufacture

Marinelli

Martina

Ganguly

et al. 2019

International Journal of Refractory Metals and Hard Materials

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“…A few studies have been reported with regards to the development of an additive manufacturing process for unalloyed tantalum, mainly employing a laser as the heat source and tantalum powder as the feedstock. Laser-powder-bedfusion (LPBF) has been used by Zhou et al [20] to produce one of the first additively manufactured structures of unalloyed tantalum. In the work of Thijs et al [21], the LPBF process was studied for unalloyed tantalum focusing mainly on the microstructural evolution and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Grain refinement in an unalloyed tantalum structure by combining Wire+Arc additive manufacturing and vertical cold rolling

Marinelli

Martina

Ganguly

et al. 2020

Additive Manufacturing

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Components manufactured via Wire + Arc Additive Manufacturing are usually characterised by large columnar grains. This can be mitigated by introducing in-process cold-rolling; in fact, the associated local plastic deformation leads to a reduction of distortion and residual stresses, and to microstructural refinement. In this research, interpass rolling was applied with a load of 50 kN to a tantalum linear structure to assess its effectiveness in changing the grain structure from columnar to equiaxed, as well as in refining the grain size. An average grain size of 650 µm has been obtained after five cycles of inter-pass rolling and deposition. When the deformed layer was reheated during the subsequent deposition, recrystallisation occurred, leading to the growth of new strain-free finer equiaxed grains. The depth of the refined region has been characterised and correlated to the hardness profile developed after rolling. A reduction of porosity was also registered. Furthermore, a random texture was formed after rolling, which should result in isotropic mechanical properties. Wire + Arc Additive Manufacturing process demonstrated the ability to deposit sound refractory metal components and the possibility to improve the microstructure when coupled with cold inter-pass rolling.

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“…Owing to its fast melting and solidification rate (10 3 –10 5 K s −1 ), SLM has been used to obtain distinctive microstructures, for example, ultrafine grain structure, supersaturated solid solution, and metastable phases . In the research of various material systems, SLM technology has been successfully applied in the preparation of the Fe‐based, Ti‐based, high‐entropy alloy, amorphous alloy, and Al‐based alloy, etc. Owing to its intrinsic merits of fine grain, complex shape, and high performance, SLM has become an effective way to solve the manufacturing challenge for precise lightweight Al alloy component with complex shapes.…”

Section: Introductionmentioning

confidence: 99%

Selective Laser Melting of Gas Atomized Al–3.02Mg–0.2Sc–0.1Zr Alloy Powder: Microstructure and Mechanical Properties

Li¹,

Chen²,

Chen³

et al. 2018

Adv Eng Mater

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Additive manufactured Sc modified Al alloys for lightweight application is now arousing widespread attraction. The selective laser melting (SLM) of gas atomized Al-3.02Mg-0.2Sc-0.1Zr powder is studied, with the emphasis on its densification, microstructure, and properties. The intrigued finding is that the very high elongation-to-failure of 32.5% is obtained with medium tensile strength of 373 MPa after heat treatment of SLM sample. The average relative density is about 98.3% at a volumetric energy density range of (VED) 42-111 J mm À3 . The microstructure of produced sample shows cracks but it can be inhibited by increasing the VED. At an excessive VED, the weld pool is transformed from heat conduction to keyhole mode owing to the metal evaporation. Nano-sized Al 3 (Sc,Zr) precipitates with a diameter of 5-50 nm are observed, which is responsible for the main strengthening mechanism. The underlying mechanisms of metallurgical defects, weld pool mode and mechanical properties are also illuminated. Figure 3. Optical micrographs of polished SLM samples from horizontal section at different VEDs: a) 42 J mm À3 , b) 52 J mm À3 , c) 63 J mm À3 , d) 73 J mm À3 , e) 83 J mm À3 , and f) 100 J mm À3 .

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Selective laser melting of pure tantalum: Densification, microstructure and mechanical behaviors

Cited by 105 publications

References 38 publications

Microstructure, hardness and mechanical properties of two different unalloyed tantalum wires deposited via wire + arc additive manufacture

Microstructure, hardness and mechanical properties of two different unalloyed tantalum wires deposited via wire + arc additive manufacture

Grain refinement in an unalloyed tantalum structure by combining Wire+Arc additive manufacturing and vertical cold rolling

Selective Laser Melting of Gas Atomized Al–3.02Mg–0.2Sc–0.1Zr Alloy Powder: Microstructure and Mechanical Properties

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