Characterisation of plasma sprayed W coatings on a CuCrZr alloy for nuclear fusion reactor applications

Montanari, Roberto; Riccardi, B.; Volterri, R.; Bertamini, L.

doi:10.1016/s0167-577x(01)00375-5

Cited by 49 publications

(31 citation statements)

References 4 publications

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“…Following droplets spread over onto pre-deposited splats whereas nucleation and solidification taking place layer by layer to finally form a columnar dominated structure. Similar results have been reported by Vardelle et al 19) Houben and Liempd 20) and Montanari et al 21) Some partially melted W particles can be observed on the fracture surface as shown in Fig. 5(b).…”

Section: Uts and Fracture Surface Analysissupporting

confidence: 90%

“…Once crack encountering a granule, delamination occurs rapidly along granule-matrix interface and lowers the strength of the parts. 21) After HIPing at 2000°C, 180 MPa for 2 h, the averaged UTS of WRe alloy parts improved up to 214 « 2 MPa due to densification (see Table 2). Initial lamellar structure is still retained in WRe deposits as shown in Figs.…”

Section: Uts and Fracture Surface Analysismentioning

confidence: 99%

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Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

et al. 2014

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Tungsten5.0 mass% rhenium (W5.0 mass%Re) composite feedstock was fabricated by a new cover method. Complex and thin-walled W5.0 mass%Re products (including one shaped charge liner and one throat) were produced by plasma spray forming (PSF) followed by hot isostatic pressing (HIPing). Scanning electron microscope (SEM), Archimedes method, Vickers hardness, tensile and compressive tests were employed to study microstructure, density, micro-hardness and mechanical properties of the parts.A lamellar structure consisting of vertical columnar grains, micron-sized pores and rough interlamellar contacts with gaps of sub-micron sizes between lamellae were found in PSF deposits. The relative density, micro-hardness, ultimate tensile strength (UTS) and compressive strength of PSF deposits were about 87 « 1%, 321 « 4 HV 0.025 , 57 « 2 and 390 « 2 MPa, respectively. As dwell time of HIPing prolonging (from 2, to 4 and 6 h), internal defects of PSF deposits including inter-lamellar gaps and micro-pores could be gradually mitigated or eliminated with initial lamellar structure transforming into granular one. Relative density and mechanical properties of WRe alloys were gradually increased under the combined action of high temperature and pressure. Especially for WRe deposits after 6 h HIPing, the relative density, micro-hardness, UTS, compressive strength and yield stress were increased high up to 98 « 1%, 490 « 4 HV 0.025 , 384 « 2 MPa, 1490 « 2 and 879 « 2 MPa, respectively. The mechanical properties and the ductility at room temperature of WRe alloys were both higher than those of W deposits. 'Re effect' was revalidated and double checked in WRe alloys fabricated by PSF and HIPing here.

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Section: Uts and Fracture Surface Analysissupporting

confidence: 90%

Section: Uts and Fracture Surface Analysismentioning

confidence: 99%

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

et al. 2014

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“…The specific coating characteristics, i.e., morphology, structure, integrity and mechanical properties, were then thoroughly investigated [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Montanari

Pakhomova

Pizzoferrato

et al. 2017

Metals

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Tungsten (W) is considered a promising plasma-facing material for protecting the divertor of the ITER (International Thermonuclear Experimental Reactor). The effects on W of transient thermal loads of high energy occurring in a tokamak under operative conditions have been simulated through a single laser pulse delivered by an Nd:YAG laser. Bulk and plasma-sprayed (PS) samples have been submitted to tests and successively examined via SEM (scanning electron microscopy) observations. In both types of materials, the laser pulse induces similar effects: (i) a crater forms in the spot central area; (ii) all around the area, the ejection and the movement of molten metal give rise to a ridge; (iii) in a more external area, the surface shows plates with jagged boundaries and cracks induced by thermal stresses; (iv) the pores present in the original material become preferred ablation sites. However, the affected surface area in PS samples is larger and asymmetric if compared to that of bulk material. Such a difference has been explained by considering how microstructural characteristics influence heat propagation from the irradiated spot, and it was found that grain size and shape play a decisive role.

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“…Previous works demonstrated the feasibility of 5 mm thick W coatings deposited on CuCrZr substrates by plasma spraying and their capability to withstand heat fluxes up to 5 MW/m 2 in condition relevant for fusion reactor plasma facing components [22].…”

Section: Case 4-w As Plasma-facing Materials In Future Nuclear Fusionmentioning

confidence: 99%

Evaluation of Structural Stability of Materials through Mechanical Spectroscopy: Four Case Studies

Costanza

Montanari

Richetta

et al. 2016

Metals

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Abstract:Microstructural stability is one of the utmost important requirements for metallic materials in engineering applications, particularly at high temperatures. The paper shows how Mechanical Spectroscopy (MS) (i.e., damping and dynamic modulus measurements) permits the monitoring of the evolution of lattice defects, porosity, and cracks which strongly affect the mechanical behavior of metals and sometimes lead to permanent damage. For this purpose, some applications of the technique to different metals and alloys (AISI 304 stainless steel, PWA 1483 single crystal superalloy, nanostructured FeMo prepared via SPS sintering and tungsten) of engineering interest are presented. These experiments have been carried out in lab conditions using bar-shaped samples at constant or increasing temperatures. The results can be used to orient the interpretation of frequency and damping changes observed through other instruments in components of complex shape during their in-service life.

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Characterisation of plasma sprayed W coatings on a CuCrZr alloy for nuclear fusion reactor applications

Cited by 49 publications

References 4 publications

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Evaluation of Structural Stability of Materials through Mechanical Spectroscopy: Four Case Studies

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Characterisation of plasma sprayed W coatings on a CuCrZr alloy for nuclear fusion reactor applications

Cited by 49 publications

References 4 publications

Near-Net-Shape Tungsten&ndash;Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

Near-Net-Shape Tungsten&ndash;Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Evaluation of Structural Stability of Materials through Mechanical Spectroscopy: Four Case Studies

Contact Info

Product

Resources

About

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing