Microstructural studies of friction stir welded Zircaloy-4

Sato, Yutaka; Nagahama, Yoshito; Mironov, S.; Kokawa, Hiroyuki; Park, Seung Hwan C.; Hirano, Satoshi

doi:10.1016/j.scriptamat.2012.04.029

Cited by 40 publications

(23 citation statements)

References 24 publications

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“…From the micro-hardness profile, the hardness of the a-Zr substrates ranges from 170 to 180 HV, which is in accordance with the description of Ref. [13]. However, the hardness of the a-Zr substrates adjacent to the Zone b?a (high hardness a-Zr zone shown in Fig.…”

Section: Resultssupporting

confidence: 88%

“…b transformation decreases with temperature increasing. For example, the Zircaloy-4 substrates entirely transform into b-Zr when the bonding temperature is 1000°C [10,13], even when the Ni composition in the substrate is as low as zero, as shown in Fig. 2c.…”

Section: Resultsmentioning

confidence: 97%

“…The microhardness was measured by a Vickers tester (UHL, VMHT, HVS-50) exerting a 1 kg load with a duration of 10 s. [22,23] taking place during TLPB process. In Zircaloys, the a-Zr phase is stable up to $825°C, a two-phase (a + b) field extends from there up to $975°C, and the b-Zr phase is stable above $975°C [10,13]. When the bonding temperature exceeds the transus temperature of (a + b) ?…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, it is necessary to do some researches on the self-joined Zircaloy-4 joints. Recently, investigations on the joining technologies of Zircaloy-4 are well performed by several researchers, such as brazing [5][6][7], laser welding [8,9], gas tungsten arc welding [10,11], hot isostatic pressing (HIP) bonding [12], friction stir welding [13] and electron beam welding [14]. All of these joining technologies have a series of advantages respectively, whereas also accompany a few of drawbacks.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Interfacial microstructure and properties of the self-joined Zircaloy-4 joints with Ni foil

Chen

Long

Wei

et al. 2014

Journal of Nuclear Materials

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interfacial microstructure and properties of the self-joined Zircaloy-4 joints with Ni foil

Chen

Long

Wei

et al. 2014

Journal of Nuclear Materials

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“…This condition is consistent with the viewpoint that the predominant deformation mode in NZ is simple shear. 18,19,29,30 Another important microstructure feature in NZ is band structure (BS), which has been observed in FSW joints of 304 stainless steel 15,16 and copper. 31 The BS details in the FSW joint of the studied Zr-Ti alloy are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and mechanical properties of friction stir welded joints of Zr–Ti alloy

et al. 2014

Science and Technology of Welding and Joining

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Zirconium-titanium alloy joints were successfully produced by friction stir welding. Unlike the (azb) dual phase microstructure in base metal, only the b phase existed in the region in which temperature exceeded the b transient point for the as welded joint. Accordingly, the hardness in these regions exhibited integral decrement and uniform distribution features. The thermal simulation further showed that hardness variation was mainly determined by phase composition. Microstructure development in the nugget zone was mainly governed by continuous dynamic recrystallisation. Satisfactory ultimate tensile strength and elongation equal to the base metal were achieved in the as welded joint. Tensile fracture occurred at the heat affected zone near the retreating side of the joint. The fracture surface of the joint exhibited a mixing feature with quasicleavage facets and small dimples.

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Effect of Bonding Temperature on Microstructure and Mechanical Properties of 304L/Zircaloy‐4 Diffusion‐Bonded Joints with Ni/Ta Hybrid Interlayer

et al. 2021

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Diffusion bonding of stainless steel 304 L and zircaloy‐4 (Zr‐4) in solid state is conducted using Ni and Ta as the hybrid interlayer at the bonding temperature of 850−1000 °C for the bonding time of 30 min under the bonding pressure of 6 MPa in vacuum. The effect of the bonding temperature on the microstructure and the mechanical properties of the joints is investigated. The microstructure analysis is conducted by a scanning electron microscope, energy dispersive spectroscopy, and X‐ray diffraction. The mechanical properties of the joints are measured by a shear test and microhardness test. The results show that Ni3Ta intermetallic compounds are formed at the Ni/Ta interface, and the solid solution of Zr and Ta appears at the Ta/Zr‐4 interface. In the meantime, the maximum shear strength reaches 194 MPa and the highest hardness value across the interface of joints is 356 HV in the Ni3Ta layer.

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Microstructural studies of friction stir welded Zircaloy-4

Cited by 40 publications

References 24 publications

Interfacial microstructure and properties of the self-joined Zircaloy-4 joints with Ni foil

Interfacial microstructure and properties of the self-joined Zircaloy-4 joints with Ni foil

Microstructures and mechanical properties of friction stir welded joints of Zr–Ti alloy

Effect of Bonding Temperature on Microstructure and Mechanical Properties of 304L/Zircaloy‐4 Diffusion‐Bonded Joints with Ni/Ta Hybrid Interlayer

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