Tensile properties and microstructures of electron beam welded molybdenum and TZM

Morito, F.

doi:10.1016/0022-5088(89)90391-3

“…As can be seen from the above research results, the results illustrate that grains in weld seam of Mo by EBW grow rapidly. Morito et al (1989) [17] found that a joint of molybdenum-titanium-zirconium (TZM) alloys welded using EBW at room temperature always shows brittle fracture. However, at temperature higher than 300 • C, the joint always presents ductile fracture, and there is obvious necking phenomenon before fracturing.…”

Section: Ebwmentioning

confidence: 99%

Technology of Welding and Joining

2021

0

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“…As can be seen from the above research results, the results illustrate that grains in weld seam of Mo by EBW grow rapidly. Morito et al (1989) [17] found that a joint of molybdenum-titanium-zirconium (TZM) alloys welded using EBW at room temperature always shows brittle fracture. However, at temperature higher than 300 • C, the joint always presents ductile fracture, and there is obvious necking phenomenon before fracturing.…”

Section: Ebwmentioning

confidence: 99%

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

Zhu¹,

Xie

²

,

Shang

³

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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“…Figure 6 shows the relationship of <J c and DBTI to C gb in P 1M Mo. 5,11,[14][15][16] Irrespective of the base metal or the welds, carbon-doped samples showed higher <Jcand therefore lower DBTI with an increase of Co above 20 at.% carbon. The value of <J exceeded 1 CPa and DBTI dropped belo\~1 180 K. In-situ fracture testing of hlgh-purity molybdenum bicrystals produced from EB zone melting and EB welding showed an intrinsic intergranular embrittlement.…”

Section: Raw Powdermentioning

confidence: 99%

Characteristics of EB-weldable molybdenum and Mo-Re alloys

Morito¹

1993

JOM

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The electron-beam weldability, structure, and mechanical behavior of molybdenum and Mo-Re alloys produced via powder metallurgy were characterized by comparison with those produced by ingot metallurgy. By establishing the fabrication and processing for reducing the total oxygen of the starting materials, sound electron-beam welds of the powder metallurgy materials could be obtained. Intergranular embrittlement in the weld metal was improved by heat treatment. Carbon doping and postweld heat treatment were significantly effective to recover the strength and, therefore, the ductility. This is primarily attributed to an increase of the grain boundary cohesion due to the effective carbon segregation and precipitation. As a result, it was found that the welds of the powder metallurgy materials have good potential not only for high-performance materials but also for structural components.

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Tensile properties and microstructures of electron beam welded molybdenum and TZM

Cited by 15 publications

References 7 publications

Technology of Welding and Joining

Technology of Welding and Joining

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

Characteristics of EB-weldable molybdenum and Mo-Re alloys

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