Microstructure and mechanical properties of a Fe-28%Al-5%Cr-1%Nb-2%B alloy fabricated by Laser Engineered Net Shaping

Łazińska, Magdalena; Durejko, T.; Zasada, D.; Bojar, Z.

doi:10.1016/j.matlet.2017.03.022

Cited by 20 publications

(11 citation statements)

References 14 publications

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“…Furthermore, practically no frozen or equiaxed grains were observed, which are typically observed after AM [ 17 , 18 ]. However, it has been proved that only doping of Fe 3 Al alloys by Zr, B, or Nb, B can provide to equiaxed grain structure in the middle/top zones and all volume of the sample, respectively [ 18 , 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…The morphology of the resulting grains strongly depends on the cooling rate in the crystallization zone. Depending on the cooling rate and the direction of heat dissipation, the formed structure can consist of frozen, columnar, or dendrite grains [ 18 , 19 , 20 , 21 ]. A highly textured structure gives rise to the anisotropy of thermal and mechanical properties of the fabricated elements.…”

Section: Introductionmentioning

confidence: 99%

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The Microstructure Evolution of a Fe3Al Alloy during the LENS Process

2018

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A Fe3Al intermetallic alloy has been successfully prepared by the laser-engineered net shaping (LENS) process. The applied process parameters were selected to provide various cooling rates during the solidification of the laser-melted material. The macro- and microstructure and the micro- and macrotexture of Fe3Al samples were investigated. The influence of the cooling rate on grain morphology and texture is discussed. For the applied cooling rate range of 0.64 × 104 K/s–2.6 × 104 K/s, the structure is characterized by the presence of columnar grains for which the growth is directed upwards from the substrate. The intensity of the microtexture varies with the height of the sample and the cooling rate. The intensity of the texture increases with the decrease in the cooling rate. The samples that were obtained with low and medium cooling rates are characterized by the well-developed <100> and <111> macrotextures. The Fe3Al alloy that was produced with a high cooling rate did not show a specific texture, which is reflected in the fairly uniform distribution of the normalized density intensity. Only a very weak texture with a <100> type component was observed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Microstructure Evolution of a Fe3Al Alloy during the LENS Process

2018

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“…There is only a limited number of studies focused on the deposition of alloys with LENS®or similar techniques while using elemental powders and the work is mostly focused on pre-alloyed powders while considering the huge amount of alloys and intermetallics alloys proposed to be used [66][67][68][69][70][71]. The results of these experiments suggested that the enthalpy of mixing of the elements is one of the most important factors determining the heterogeneity and microstructure of the obtained materials.…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Fe-Al Alloys from Elemental Powders Using Laser Engineered Net Shaping

et al. 2020

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The laser engineered net shaping (LENS®) process is shown here as an alternative to melting, casting, and powder metallurgy for manufacturing iron aluminides. This technique was found to allow for the production of FeAl and Fe3Al phases from mixtures of elemental iron and aluminum powders. The in situ synthesis reduces the manufacturing cost and enhances the manufacturing efficiency due to the control of the chemical and phase composition of the deposited layers. The research was carried out on samples with different chemical compositions that were deposited on the intermetallic substrates that were produced by powder metallurgy. The obtained samples with the desired phase composition illustrated that LENS® technology can be successfully applied to alloys synthesis.

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“…However, the investigations of iron aluminides obtained by additive manufacturing are rare, and most of the work concerns the binary Fe 3 Al phase [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Therefore, the authors of only a few papers [ 21 , 43 , 44 , 45 , 46 , 47 ] have addressed the subject of the complex compositions of Fe 3 Al-based alloys. Michalcová et al [ 43 ] used selective laser melting (SLM) and laser metal deposition (LMD) technology to produce Fe30Al10Ti, Fe30Al5Ti0.7B and Fe22Al5Ti alloys, representing three different strategies for strengthening iron aluminides at high temperatures: increasing the ordering temperature D03↔B2, precipitation of borides, and generation of coherent A2 + L21 microstructures.…”

Section: Introductionmentioning

confidence: 99%

“…As for application of LENS technology for manufacturing Fe-Al alloys, Durejko et al [ 21 ] reported the successful fabrication of an Fe 3 Al (Fe30Al0.35Zr0.1B) alloy with low porosity and good mechanical properties (the strength at 650 °C matches that of the as-cast alloy) using the LENS system. Additionally, LENS technology has been employed to produce Fe28Al5Cr0.08Zr0.04B (at %) [ 44 ] and Fe28Al5Cr1Nb2B (at %) [ 45 ] alloys prepared from pre-alloyed gas-atomized powders. In the first case, the alloy was characterized by a very good oxidation resistance at high temperatures, which was comparable to or slightly better than that of the bulk materials produced using traditional technologies.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Traverse Feed Rate on the Microstructure and Mechanical Properties of Laser Deposited Fe3Al (Zr,B) Intermetallic Alloy

et al. 2018

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The results of the fabrication of components made with Fe-30%Al-0.35%Zr-0.1%B alloy powder using the Laser Engineered Net Shaping (LENSTM) system operated at different traverse feed rates are described in this paper. The temperature of the molten metal pool was recorded during this process. Depending on the assumed feed rate, the formation of Zr–based precipitates with various morphologies and distributions was observed in the structure of the investigated material. It was found that as the traverse speed increased, spheroidization, refinement, and a more homogeneous distribution of these precipitates occurred.

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Microstructure and mechanical properties of a Fe-28%Al-5%Cr-1%Nb-2%B alloy fabricated by Laser Engineered Net Shaping

Cited by 20 publications

References 14 publications

The Microstructure Evolution of a Fe3Al Alloy during the LENS Process

The Microstructure Evolution of a Fe3Al Alloy during the LENS Process

Direct Synthesis of Fe-Al Alloys from Elemental Powders Using Laser Engineered Net Shaping

The Effect of the Traverse Feed Rate on the Microstructure and Mechanical Properties of Laser Deposited Fe3Al (Zr,B) Intermetallic Alloy

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