Characteristics of EB-weldable molybdenum and Mo-Re alloys

Morito, F.

doi:10.1007/bf03223314

Cited by 18 publications

(7 citation statements)

References 10 publications

(10 reference statements)

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“…In addition, the research demonstrates that carbonization and heat treatment after welding can effectively raise the strength of the joint of Mo alloys, which is primarily attributed to an increase of the grain boundary cohesion due to the effective carbon segregation and precipitation. [18]. Morito et al (1998) [19] found that the strength and ductility of a welded joint of Mo alloys obtained through EBW can rise after increasing rhenium (Re) content.…”

Section: Ebwmentioning

confidence: 99%

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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Owing to its potential application prospect in novel accident tolerant fuel, molybdenum alloys and their welding technologies have gained great importance in recent years. The challenges of welding molybdenum alloys come from two aspects: one is related to its powder metallurgy manufacturing process, and the other is its inherent characteristics of refractory metal. The welding of powder metallurgy materials has been associated with issues such as porosity, contamination, and inclusions, at levels which tend to degrade the service performances of a welded joint. Refractory metals usually present poor weldability due to embrittlement of the fusion zone as a result of impurities segregation and the grain coarsening in the heat-affected zone. A critical review of the current state of the art of welding Mo alloys components is presented. The advantages and disadvantages of the various methods, i.e., electron-beam welding (EBW), tungsten-arc inert gas (TIG) welding, laser welding (LW), electric resistance welding (ERW), and brazing and friction welding (FW) in joining Mo and Mo alloys, are discussed with a view to imagine future directions. This review suggests that more attention should be paid to high energy density laser welding and the mechanism and technology of welding Mo alloys under hyperbaric environment.

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Section: Ebwmentioning

confidence: 99%

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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“…In the case of joining, both electron beam welding [39][40][41] and friction welding [41 ] of Mo alloys (Mo, TZM, Mo-Nb) have been performed. The effects of impurity contents and their segregation at grain boundaries upon the properties of joints have been examined.…”

Section: Molybdenum *Tomentioning

confidence: 99%

Recent Advances and Developments in Refractory Alloys

Nieh

Wadsworth

1993

MRS Proc.

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Refractory metal alloys based on Mo, W, Re, Ta, and Nb (Cb) find applications in a wide range of aerospace applications because of their high melting points and high-temperature strength. In this paper, we present recent progress in the understanding and applications of these alloys. Recent studies to improve the oxidation and mechanical behavior of refractory metal alloys, and particularly Nb alloys, will also be discussed. Some Re structures, for extremely high temperature applications (> 2000°C), made by CVD and P/M processes, are also illustrated. Interesting work on the development of new W alloys (W-HfC-X) and the characterization of some commercial refractory metals, e.g., K-doped W, TZM, and Nb-l%Zr, continues. Finally, recent developments in high temperature composites reinforced with refractory metal filaments, and refractory metal-based intermetallics, e.g., Nb3A1, Nb2Be17, and MoSi2, are briefly described.

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“…Extremely low solubility of oxygen, nitrogen and carbon 2 , which caused intensive segregation of impurities to grain boundaries or other defects, and the high melting point made the fusion welding of Mo-Re alloys difficult. There were some works emphasizing the application of different joining techniques such as electron beam welding 3 , laser beam welding 4,5 , resistance spot welding 6 and friction welding, but most of the joints revealed poor characteristics due to the formation of porosity or brittle intermetallic compounds. Reducing the oxygen content in the welds and proper welding conditions made it possible to produce sound Mo-Re welds in electron beam welding [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Fracture of 50Mo-50Re Vacuum Brazed with Fe-Si-B Filler Metal

Xia

Gong

et al. 2019

Mat. Res.

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Microstructural evolution, interfacial reaction and fracture during vacuum brazing of 50Mo-50Re alloys using amorphous alloy Fe-5.6Si-2.6B(wt%) were investigated. A binary intermetallic compound, σ(Mo 2 Re 3) formed as parallel contiguous layers in the diffusion zone. In addition, Fe from the braze alloy, in combination with dissolved Mo from the substrate, formed two layers of binary compounds μ-Mo 6 Fe 7 and λ-MoFe 2 , adjacent to diffusion zone. The unreacted Fe-based filler metal solidified as α-Fe solid solution. Fracture analysis showed that the mode of failure was mainly transgranular cleavage with partly intergranular and the fracture located on the interface of 50Mo-50Re alloy and the central area of brazing seam.

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Characteristics of EB-weldable molybdenum and Mo-Re alloys

Cited by 18 publications

References 10 publications

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Recent Advances and Developments in Refractory Alloys

Microstructure and Fracture of 50Mo-50Re Vacuum Brazed with Fe-Si-B Filler Metal

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