CuCrZr alloy hot cracking during electron beam welding

Durocher, A.; Ayrault, D.; Chagnot, Christophe; Lipa, M.; Saikaly, W.

doi:10.1016/j.jnucmat.2007.03.220

Cited by 21 publications

(8 citation statements)

References 2 publications

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“…However, due to the extreme high thermal diffusivity (i.e., approximately 10 to 100 times higher than that in some steels and nickel alloys [5][6][7]), copper alloys are generally classified as non-weldable alloys which cannot be fabricated by conventional techniques, such as fusion welding. Durocher et al [8,9], Drezet et al [10], and Gogari [11] found that hot cracking frequently occurs during electron beam welding of the CuCrZr alloys. Feng et al [12] observed the appearance of residual stress and impurities introduced by the flash butt welding process, which thus caused the decrease of the electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

Lai

et al. 2017

Metals

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Abstract:In this article, the copper-chromium-zirconium (CuCrZr) alloys plates with 21 mm in thickness were butt joined together by means of FSW (friction stir welding). The properties of the FSW joints are studied. The microstructure variations during the process of FSW were investigated by optical microscopy (OM), electron back-scattered diffraction (EBSD), and transmission electron microscopy (TEM). The results show that the grains size in the nugget zone (NZ) are significantly refined, which can be attributed to the dynamic recrystallization (DRX). The microstructure distribution in the NZ is inhomogeneous and the size of equiaxed grains are decreased gradually along the thickness direction from the top to bottom area of the welds. Meanwhile, it is found that the micro-hardness and tensile strength of the welds are slightly increased along the thickness direction from the top to the bottom area of the welds. All the nano-strengthening precipitates in the BM are dissolved into the Cu matrix in the NZ. Therefore, the decreases in hardness, tensile strength, and electrical conductivity can be attributed to the comprehensive effect of dissolution of nano-strengthening precipitates into the supersaturation matrix and severe DRX in the welded NZ.

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Section: Introductionmentioning

confidence: 99%

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

Lai

et al. 2017

Metals

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“…In other hand, the welding seams are located in the regions of stress concentration. And it is found that the occurrence of micro cracks is usually located at the FZ [4,5]. Therefore, the microstructure of the FZ and the mechanical properties of welding seam should be investigated to control the quality of welding seam.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…After aging at 600 • C for 2 h, the strength of this welded joint increased obviously, whereas the ductility decreased slowly. The strength decreasing of the welded joint can be explained by the grain boundary segregation of Cr precipitated during the solidification [4]. In the aging treatment, the segregated Cr would dissolve into the Cu grain again resulting in the strength increasing of the welded joint.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…The ITER-grade CuCrZr [3] is chosen as the heat sink material for the four parts mentioned above, because of its good thermomechanics properties. To realize the seal joint of the heat sink on the different units, the electron beam welding (EBW) technique was applied in taking advantage of its high aspect ratio fusion zones (FZ) and narrow heat affected zones (HAZ), as performed in CEA [4,5]. During the operation of EAST device, high pressure water coolant would be inlet into the CuCrZr heat sink to remove the heat.…”

Section: Introductionmentioning

confidence: 99%

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Application of e-beam welding in W/Cu divertor project for EAST

Wang

Zhao

et al. 2015

Fusion Engineering and Design

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“…The industrial application of Cu-Cr-Zr alloy unavoidably involves the welding and joining processes. However, voids and hot cracks were easily formed in the nugget zone (NZ) when adopting the fusion welding techniques [5][6][7]. Even if the welding defects were eliminated, it is still a big challenge to keep the good mechanical properties and conductivity of the base material (BM).…”

Section: Introductionmentioning

confidence: 99%

Realising equal-strength welding with good conductivity in Cu–Cr–Zr alloy via friction stir welding

Wang

Zhu

Xie

et al. 2021

Science and Technology of Welding and Joining

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Realising high-quality welding of the peak aged Cu-Cr-Zr alloy has always been a big challenge. Under a low rotation rate of 400 rev min −1 , equiaxed ultrafine grains together with nanoscale precipitates with comparable size to that of the peak aged state were obtained in the nugget zone of the friction stir welded joint. Further, the initial strengthened precipitates were also preserved near the nugget zone, neither dissolved nor coarsened. Therefore, softening zone disappeared and a high-quality weld with equal strength to the base material was first achieved. Furthermore, the electrical conductivity of the joint was hardly weakened. This study provides an effective method to improve the strength and electrical conductivity of the precipitation-hardened Cu alloy joints.

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CuCrZr alloy hot cracking during electron beam welding

Cited by 21 publications

References 2 publications

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

Application of e-beam welding in W/Cu divertor project for EAST

Realising equal-strength welding with good conductivity in Cu–Cr–Zr alloy via friction stir welding

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