Additive manufacturing of a near-eutectic Mo–Si–B alloy: Processing and resulting properties

Fichtner, Dieter; Schmelzer, Janett; Yang, Wanbo; Heinze, Christoph; Krüger, Manja

doi:10.1016/j.intermet.2020.107025

Cited by 19 publications

(10 citation statements)

References 28 publications

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“…The load and holding time were set to 196 N and 15 s, respectively; three points were selected for each area to be tested, and the average value was obtained. The appropriate parameters for the measurement were selected according to the study [13][14][15][16][17][18]. scanning speed of 900 mm/s along the cross-section.…”

Section: Methodsmentioning

confidence: 99%

“…Zhou et al [15,16] also successfully used the laser-selective melting technique for the three-dimensional forming of ball-milled Mo-Si-B-Ti-C alloys, and due to the rapid solidification process of additive manufacturing, the final tissue formed had fine grain size and uniform distribution of TiC nanoparticles, but its microhardness was low compared with that of cast alloys of the same composition due to the microcracks existing inside the material. Fichtner et al [17] have explored Mo-Si-B alloys by laser powder bed fusion and developed suitable process parameters for the generation of crack-free samples. Higashi et al [18] have conducted Selective Laser Melting of Mo-Si-B alloys and found that rapid solidification via Selective Laser Melting (SLM) resulted in the refinement of microstructure and the formation of a supersaturated Mo ss phase.…”

Section: Introductionmentioning

confidence: 99%

“…The heat source types were considered a very important influencing factor in the formation of the melt pool microstructure [13,17]. However, the contrastive studies between laser beam remelting and electron beam remelting on the Mo-Si-B alloy are rare [13][14][15][16][17][18]. In this paper, two processes, laser remelting and electron beam remelting, are used to process the surface of the Mo-12Si-8.5B alloy.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study on the Surface Remelting of Mo-Si-B Alloys with Laser and Electron Beam

Wang

et al. 2022

Materials

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The Mo-12Si-8.5B alloy was surface-remelted by laser and electron beam, and the microstructure of its melt pool and substrate regions were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy spectrometry (EDS) techniques. It was found that the composition of the surface phases in the Mo-12Si-8.5B alloy did not change by the high-energy beam surface remelting process, but the microstructure of the molten pool region was significantly different from that of the substrate region, and its phase distribution was more uniform. Dendrites appeared on the surface of the material under the action of both processes, and the Si- and B-rich phases were mainly gathered in the interdendritic region. In the melt pool of the laser-remelted specimens, the α-Mo phase was continuously distributed with an average dendrite length of 70 µm, while the α-Mo phase distribution in the melt pool of the electron beam remelted specimens were relatively concentrated, with a larger dendrite size and an average dendrite length of 120 µm. The dendrite size in the melt pool of the laser remelted material was smaller, and the distribution of the elements was relatively uniform. Using a laser beam as the heat source was more favorable for the next step of the additive manufacturing of the core parts of hypersonic vehicles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Study on the Surface Remelting of Mo-Si-B Alloys with Laser and Electron Beam

Wang

et al. 2022

Materials

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“…Nevertheless, the room-temperature strength and ductility of pure and alloyed Mo is restricted by low grain-boundary cohesion [4][5][6][7]. This leads to higher ductile-to-brittle transition temperatures and an intergranular fracture mode [8][9][10], which limits the manufacturability and application of Mo-based alloys as structural materials.…”

Section: Introductionmentioning

confidence: 99%

“…Though the use of high-purity raw materials and heat treatment can provide the means to reduce the effect of the O-induced embrittlement, the O content can nevertheless increase significantly during the processing, for example, during welding [11][12][13][14], high-temperature forming [16], or additive manufacturing [9]. In Figure 1, the oxygen concentrations in various types of Mo-based alloys are presented, which were processed by different production routes, namely, ingot metallurgy, powder metallurgy, and additive manufacturing.…”

mentioning

confidence: 99%

Effect of Oxygen in Mo-TM (TM = Ti, Zr, Hf) Solid Solutions as Studied with Density Functional Theory Calculations

Touzani,

Nizinkovskyi,

Krüger

2024

Crystals

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Mo-Ti-Si, Mo-Zr-B, and Mo-Hf-B are promising alloy systems for high-temperature applications as they show higher toughness and higher creep resistance than other Mo-based alloys. Regarding ductility and toughness, the chemical composition of the Mo solid-solution phase is the main parameter with which to tweak these properties of multiphase Mo-based alloys. Besides the common solid-solution hardening, one goal is to minimize embrittlement by decreasing the detrimental effects of interstitials like oxygen atoms in Mo alloys, which might be present in the bulk material due to trapping. For a better understanding of the trapping mechanisms and behavior of Mo solid solutions, the bonding situation and interaction of Mo atoms with the atoms of the alloying partners, as well as oxygen atoms, is worthwhile to investigate. For this, an in-depth analysis of the chemical bonding situation with calculations based on density functional theory in selected Mo-TM(-O) (TM = Ti, Zr, Hf) solid solutions is conducted in this work. It is shown that Ti atoms in a Mo solid solution are strong traps for oxygen atoms, while Hf and, even more clearly, Zr atoms are not. It is pointed out that the ionic and covalent interactions are the primary influence on the trapping behavior, as the change in ionic and covalent interactions between trapping and nontrapping models follows the trend Mo-1Ti > Mo-1Hf > Mo-1Zr, which resembles the trend of the trapping energy.

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Mechanical and microstructural properties of additively manufactured Ti–6Al–4 V stents with CO2 laser postannealing treatment

Tseng

Hung

Chang

2022

Int J Adv Manuf Technol

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Additive manufacturing of a near-eutectic Mo–Si–B alloy: Processing and resulting properties

Cited by 19 publications

References 28 publications

Comparative Study on the Surface Remelting of Mo-Si-B Alloys with Laser and Electron Beam

Comparative Study on the Surface Remelting of Mo-Si-B Alloys with Laser and Electron Beam

Effect of Oxygen in Mo-TM (TM = Ti, Zr, Hf) Solid Solutions as Studied with Density Functional Theory Calculations

Mechanical and microstructural properties of additively manufactured Ti–6Al–4 V stents with CO2 laser postannealing treatment

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