Intermetallics Synthesis in the Fe–Al System via Layer by Layer 3D Laser Cladding

Shishkovsky, Igor; Missemer, Floran; Kakovkina, Nina; Smurov, I.

doi:10.3390/cryst3040517

Cited by 35 publications

(33 citation statements)

References 28 publications

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“…Song et al 12,13 produced parts of 98% density from a FeAl powder by selective laser melting (SLM) and Bax et al consolidated a FeAl powder by laser cladding. 14 Layer-by-layer production of powder stacks and subsequent uniaxial pressing, 15 layer-by-layer 3D cladding, 16 and laser engineered net shaping (LENS) 17 have been explored for the production of chemically graded Fe-Al samples. The only reports on ALM of Fe 3 Al-based alloys are on precipitation hardened Fe-30Al-0.35Zr-0.1B (in at.%) 18 and Fe-Al-Ti alloys 19 by LENS.…”

Section: Introductionmentioning

confidence: 99%

Laser metal deposition and selective laser melting of Fe–28 at.% Al

et al. 2014

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The iron aluminide Fe 3 Al has been successfully processed by selective laser melting (SLM) and laser metal deposition (LMD). Process parameters have been determined by which defect free and dense (.99.5%) samples were produced. However, due to the low thermal conductivity of Fe 3 Al, preheating the substrate to 200°C was necessary to prevent cracking during cooling. Microstructural characterization by electron backscatter diffraction (EBSD) showed that in spite of the high cooling rates large elongated grains grew in the building direction, more distinctive for SLM than for LMD. These grains show a continuous change in the crystallographic orientation. Evaluation of the compressive flow stress showed that the anisotropic microstructure results in anisotropic mechanical properties, depending whether the samples are loaded in building direction or perpendicular to it. The alloy shows a very high strength up to 600°C and -concerning the coarse microstructure -becomes ductile already at low temperatures.

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Section: Introductionmentioning

confidence: 99%

Laser metal deposition and selective laser melting of Fe–28 at.% Al

et al. 2014

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“…FeAl (110) 41° (Wang et al, 2003;Farahat y El-Badry, 2009) Fe 3 Al (110) 42° (Shishkovsky et al, 2013;Rajan et al, 2014) Fe 2 Al 5 (222) 44°F…”

Section: Cim Pmi 2θ Referenciamentioning

confidence: 99%

Inhibition of the formation of intermetallic compounds in aluminum-steel welded joints by friction stir welding

López¹,

Ramírez²

2015

REVMETAL

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RESUMEN:La unión de juntas aluminio-acero, sin la formación de fases deletéreas del tipo Fe x Al y , ha sido, por décadas, un desafío para los procesos de soldadura. La soldadura por fricción-agitación ha sido empleada para intentar reducir el aporte térmico y evitar la formación de compuestos intermetálicos. Usando esta técnica fueron soldadas juntas disimilares de aluminio 6063-T5 y acero AISI-SAE 1020. La soldadura fue acompañada de medidas de temperatura durante su ejecución. La interfase de las juntas soldadas fue caracterizada utilizando microscopía óptica, electrónica de barrido y electrónica de transmisión. Adicionalmente fueron realizadas medidas puntuales X-EDS y DRX. Los resultados experimentales revelan que la temperatura máxima en la junta es inferior a 360 °C. La caracterización microestructural en la interfase aluminio-acero demostró la ausencia de compuestos intermetálicos, condición atribuida al uso de parámetros de soldadura con bajo aporte térmico. ABSTRACT: Inhibition of the formation of intermetallic compounds in aluminum-steel welded joints by friction stir welding.Formation of deleterious phases during welding of aluminum and steel is a challenge of the welding processes, for decades. Friction Stir Welding (FSW) has been used in an attempt to reduce formation of intermetallic compounds trough reducing the heat input. In this research, dissimilar joint of 6063-T5 aluminum alloy and AISI-SAE 1020 steel were welded using this technique. The temperature of welded joints was measured during the process. The interface of the welded joints was characterized using optical microscopy, scanning and transmission electron microscopy. Additionally, composition measurements were carried out by X-EDS and DRX. The experimental results revealed that the maximum temperature on the joint studied is less than 360 °C. The microstructural characterization in the aluminum-steel interface showed the absence of intermetallic compounds, which is a condition attributed to the use of welding with low thermal input parameters.

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“…As was noted in Section 11.2, we experimentally approved the layerwise laser melting and cladding process in the Me + Al (Me ¼ Ti, Ni or Fe) systems [4,12,[20][21][22] and theoretically substantiated [23] the approach, where the strengthened intermetallide is created directly within the LAM process in the metallic matrix due to the synthesis reaction. Nickel aluminides NiAl and Ni 3 Al are characterized by high heat resistance, including the conditions of high-temperature gas flows.…”

Section: Thermophysical Estimations and Fractal Behavior For Laser-comentioning

confidence: 87%

“…On the whole, the microhardness values correspond to similar measured values for the iron aluminides after the laser welding. As is evident from this curve, the most intensive lines belong to (111) Figure 11.13 Microhardness distributions of Fe-Al FG multilayer system [22]. The lower curve in Figure 11.14 corresponds to the diffractogram of the initial 1:1 ratio Fe + Al powder mixture that has not undergone any treatment.…”

Section: Laser Synthesis In Fe-al Systemmentioning

confidence: 97%