High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

Łyszkowski, Radosław

doi:10.3390/ma8041499

Cited by 20 publications

(11 citation statements)

References 25 publications

(58 reference statements)

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“…Laser solid forming (LSF) is an advanced material-forming technology that can be used to fabricate high-performance 3D near-net shape metal components without the need for tooling [1,2]. Samples were deposited point-by-point, line-by-line, and layer-by-layer via the melting/solidification of metal powders.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Dilute Region and Microstructure Evolution in Laser Solid Forming TA15/Ti2AlNb Dual Alloy

Tan

Zhu

et al. 2020

Materials

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TA15/Ti2AlNb multiple-layer samples and a dual-alloy sample were fabricated by laser solid forming (LSF) in this study. The formation mechanism of the dilute region and microstructure evolution of the dual alloy were analyzed. The results confirmed a “step” distribution of the composition among several initial layers in the multiple-layer samples, which can be explained by calculating the ratio of the remelted zone to the deposited Ti2AlNb zone in each deposited layer. However, the “step” compositional distribution disappears, and the compositional variation tends to be more continuous and smooth in the TA15/Ti2AlNb dual-alloy sample, which is attributed to alloy elements’ diffusion at the subsequent multiple re-melting and the longer thermal cycle. The macrostructure of the TA15/Ti2AlNb dual-alloy sample consists of epitaxially grown columnar prior β grains at the TA15 side and equiaxed grains at the Ti2AlNb side, while the microstructure shows a transition of α+β→α+α2+β/B2→α2+β/B2→α2+B2+O with increasing amounts of Ti2AlNb, leading to the microhardness also changing significantly.

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Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Dilute Region and Microstructure Evolution in Laser Solid Forming TA15/Ti2AlNb Dual Alloy

Tan

Zhu

et al. 2020

Materials

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“…Moreover, the structure refinement and mechanical properties are also presented. Previous studies [34,35] showed that this material had a good corrosion resistance, some ductility at room temperature and high strength at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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Tri-axial plane-strain forging was applied to the Fe-28Al-5Cr-0.8Zr-0.04B intermetallic alloy, in order to study its grain refinement and possible improvement in mechanical properties. The forging temperature range was from 20 to 600°C. The maximum number of forging passes was 67. The deformed microstructure was investigated using electron backscatter diffraction in a scanning electron microscope. At forging temperatures \500°C, the alloy was very prone to brittle cracking. At the temperature range of 500-600°C, the overall plasticity of material increased and the cracking tendency was reduced but not completely eliminated. Extensive processes of dynamic recovery/recrystallization were observed during forging at 600°C after 10-40 passes. Recrystallized areas with an average grain size of a few micrometers were observed. However, even after severe deformation at 600°C, resulting from 40 forging passes (e * 11.3), dynamic recrystallization was incomplete and the fraction of low-angle boundaries was still high. The Vickers microhardness substantially increased from 280 HV0.1 to 450 HV0.1 at the center of the sample after both deformations at room temperature as well as after 20-40 cycles at 500-600°C. However, a further increase of strain for a sample deformed at 600°C after 67 passes (e * 28) led to quite a significant hardness decrease at the center of the sample. This phenomenon could be associated with the initiation of dynamic recrystallization. None of the samples forged at the 500-600°C range exhibited any ductility improvement during subsequent tensile testing at room temperature, most likely, owing to the absence of a uniform ultrafine-grained structure developed during forging.

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“…Fe-Al intermetallic compounds have attracted the attention of many researchers due to their unique properties, including oxidation and corrosion resistance [1][2][3][4][5][6], considerable high-temperature strength, and creep resistance [7][8][9][10][11]. In addition, a significant advantage of Fe-Al alloys is the low cost of substrates, which enables an economically justified manufacturing process [12][13][14][15][16].…”

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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High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

Cited by 20 publications

References 25 publications

Formation Mechanism of Dilute Region and Microstructure Evolution in Laser Solid Forming TA15/Ti2AlNb Dual Alloy

Formation Mechanism of Dilute Region and Microstructure Evolution in Laser Solid Forming TA15/Ti2AlNb Dual Alloy

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

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

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