Binder jetting of the AlCoCrFeNi alloy

Karlsson, Dennis; Lindwall, Greta; Lundbäck, Andreas; Amnebrink, Mikael; Boström, Magnus; Riekehr, Lars; Schuisky, Mikael; Sahlberg, Martin; Jansson, Ulf

doi:10.1016/j.addma.2019.02.010

Cited by 39 publications

(30 citation statements)

References 28 publications

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“…The samples were homogenized for 20 h at 1350 K under Ar atmosphere followed by cooling in the oven back to room temperature. The temperature range and duration were chosen on the basis of work on the same material system found in literature (Kao et al, 2009;Karlsson et al, 2019a). Those samples are hereby referred to as the heat treated or homogenized sample condition.…”

Section: Methodsmentioning

confidence: 99%

“…In 2015, for the first time additive manufacturing of AlCoCrFeNi was demonstrated by selective electron beam melting (SEBM; Fujieda et al, 2015) and laser engineered net shaping (LENS; Kunce et al, 2015). Since then other additive manufacturing methods like LMD (Wang et al, 2017), selective laser melting (SLM; Niu et al, 2019), and binder jetting (Karlsson et al, 2019a) have been utilized to fabricate the equimolar AlCoCrFeNi alloy. Generally, within the Al x CoCrFeNi alloy system the work on additive manufacturing mainly concentrates on the equimolar AlCoCrFeNi composition.…”

Section: Introductionmentioning

confidence: 99%

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Alloy Design and Microstructure Evolution in the AlxCoCrFeNi Alloy System Synthesized by Laser Metal Deposition

et al. 2020

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In this contribution the Al x CoCrFeNi alloy system is explored thoroughly over a wide compositional range of x = 0.2 to 1.5 (5 to 30 at% Al). For this alloy system compositional gradient structures were produced by laser metal deposition of pre-alloyed CoCrFeNi and elemental Al powders using an in-house developed coaxial cladding system COAXpowerline. The evolution of the microstructure with increasing Al content was analyzed in the as built as well as the homogenized condition (1350 K for 20 h). Metallographic cross sections were prepared and thoroughly analyzed by means of scanning electron microscopy, energy dispersive X-ray spectroscopy, and electron backscattered diffraction. Additionally, the evolution of the sample hardness with increasing Al contents was determined for both sample conditions. In the Al x CoCrFeNi alloy system the lattice structure as well as the sample hardness can easily be adjusted by the variation of Al. With increasing Al content a phase transition from a solid solution fcc phase toward a multiphase bcc microstructure consisting of a Fe and Cr rich solid solution bcc phase and an ordered Al and Ni rich bcc B2 phase can be observed. This is combined with an increase in sample hardness from around 200 HV up to around 500 HV in the as built condition. The compositional regions of the phase transitions for both sample conditions were compared to ab initio thermodynamic calculations done using a CALPHAD approach. For the as built condition a strong deviation from the calculated transition regime could be observed. After homogenization the experimental and calculated data are in good agreement.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alloy Design and Microstructure Evolution in the AlxCoCrFeNi Alloy System Synthesized by Laser Metal Deposition

et al. 2020

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“…This use means that approximately half of the published works used a powder bed technique and the other half used a powder feed technique. Only two papers were found on HEAs manufactured on binder-based additive manufacturing techniques [23,24]. In Table 1 is summarized this distribution of technologies.…”

Section: Additive Manufacturing and High Entropy Alloysmentioning

confidence: 99%

“…The amount of B2/BCC relative to the FCC phase can be regulated through the relationship in the composition between Al and Ni [48,60] and through proper heat treatments after AM manufacturing. The higher the annealing temperature is, the greater the amount of FCC phase that can be found in the microstructure [24,58]. To avoid the presence of σ phase, which can have a negative effect for some properties (such as corrosion behavior), the alloy can be quenched from the annealing temperature [58].…”

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 99%

High Entropy Alloys Manufactured by Additive Manufacturing

Torralba

Campos

2020

Metals

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High entropy alloys have attracted much interest over the last 16 years due to their promising an unusual properties in different fields that offer many new possible application. Additionally, additive manufacturing has drawn attention due to its versatility and flexibility ahead of a new material challenge, being a suitable technology for the development of metallic materials. Moreover, high entropy alloys have demonstrated that many gaps exist in the literature on its physical metallurgy, and in this sense, additive manufacturing could be a feasible technology for solving many of these challenges. In this review paper the newest literature on this topic is condensed into three different aspects: the different additive manufacturing technologies employed to process high entropy alloys, the influence of the processing conditions and composition on the expected structure and microstructure and information about the mechanical and corrosion behavior of these alloys.

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“…Kuwabara et al [35] investigated the microstructure, mechanical properties, and corrosion resistance of the AlCoCrFeNi HEA fabricated by EPBF. Karlsson et al [36] constructed AlCoCrFeNi alloy strengthened by a hierarchical microstructure with nano-sized precipitates using the BJT process and heat treatment. Sun et al [37] explored the hot tearing mechanisms of CoCrFeNi HEA manufactured by LPBF.…”

Section: Introductionmentioning

confidence: 99%

Influences of Process Parameters on the Microstructure and Mechanical Properties of CoCrFeNiTi Based High-Entropy Alloy in a Laser Powder Bed Fusion Process

et al. 2021

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Recently, high-entropy alloys (HEAs) have attracted much attention because of their superior properties, such as high strength and corrosion resistance. This study aimed to investigate the influences of process parameters on the microstructure and mechanical properties of CoCrFe NiTiMo HEAs using a laser-based powder bed fusion (LPBF) process. In terms of laser power and scan speed, a process map was constructed by evaluating the density and surface roughness of the as-built specimen to optimize the process parameters of the products. The mechanical properties of the as-built specimens fabricated at the optimum fabrication condition derived from the process map were evaluated. Consequently, the optimum laser power and scan speed could be obtained using the process map evaluated by density and surface roughness. The as-built specimen fabricated at the optimum fabrication condition presented a relative density of more than 99.8%. The microstructure of the as-built specimen exhibited anisotropy along the build direction. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively.

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Binder jetting of the AlCoCrFeNi alloy

Cited by 39 publications

References 28 publications

Alloy Design and Microstructure Evolution in the AlxCoCrFeNi Alloy System Synthesized by Laser Metal Deposition

Alloy Design and Microstructure Evolution in the AlxCoCrFeNi Alloy System Synthesized by Laser Metal Deposition

High Entropy Alloys Manufactured by Additive Manufacturing

Influences of Process Parameters on the Microstructure and Mechanical Properties of CoCrFeNiTi Based High-Entropy Alloy in a Laser Powder Bed Fusion Process

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