Investigation of Grain-Scale Stresses and Modeling of Tensile Deformation in a ZIRCALOY-4 Weldment

Carr, David G.; Holden, T. M.; Ripley, Maurice I.; Brown, Donald W.; Vogel, Sven C.

doi:10.1007/s11661-007-9270-y

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…MacEwen et al [1989] have shown that the Taylor-type approach does not work well for the prediction of residual grain-interaction stresses in zirconium alloys. On the other hand, it has been demonstrated that the evolution of internal strains and stresses in HCP polycrystalline AZ31 and Zircaloy-4 can be predicted with the aid of the elastic-plastic self-consistent model [see Agnew et al, 2006;Carr et al, 2007]. It is now generally accepted that a self-consistent approach is more suitable than the full constraint Taylor approach for the constitutive modeling of HCP polycrystals.…”

Section: Introductionmentioning

confidence: 99%

On the Large Strain Torsion of HCP Polycrystals

Wang

Neale

2012

Int. J. Appl. Mechanics

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The large strain torsion of polycrystalline materials with the hexagonal close packed (HCP) crystallographic structure is numerically studied by using a special purpose finite element. All simulations are based on the recently developed large strain elastic viscoplastic self-consistent (EVPSC) model for polycrystalline materials. For the first time, the effect of twinning on the large strain torsion is assessed in the present study. It is found that the response of the large strain torsion of HCP polycrystals is very sensitive to the initial texture and texture evolution. Numerical results indicate that excluding texture evolution dramatically reduces the development of the second-order axial strain under free-end torsion, or the axial force under fixed-end torsion. It is also numerically demonstrated that twinning has a significant influence on the large strain torsion of HCP polycrystals. For the magnesium alloy AZ31 extruded bar, the predicted results are in good qualitative agreement with experimental observations.

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Section: Introductionmentioning

confidence: 99%

On the Large Strain Torsion of HCP Polycrystals

Wang

Neale

2012

Int. J. Appl. Mechanics

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“…Kaschne et al (2000) found that the compressive-yield responses of high and low-purity Zr depend on the loading orientation relative to the c-axis of the hexagonal closed packed cell. Carr et al (2007) studied the variations in residual lattice strains parallel and perpendicular to the applied stress with neutron diffraction measurements on a variety of crystallographic reflections. A set of macrographs of the ZR4-EBW-W1 post-tensile specimen are shown in Figure 11.…”

Section: Tensile Testmentioning

confidence: 99%

Room temperature mechanical properties of electron beam welded zircaloy-4 sheet

Parga

Rooyen

Coryell

et al. 2017

Journal of Materials Processing Technology

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Resumption of operations at the Transient Reactor Test (TREAT) facility at Idaho National Laboratory was approved in 2014 to meet U.S. Department of Energy Office of Nuclear Energy objectives in transient testing of nuclear fuels. In parallel, the National Nuclear Security Administration, through the Office of Material Management and Minimization, is converting TREAT from its existing highly enriched uranium core to a low-enriched uranium core. This effort entails designing, fabricating, and qualifying a new TREAT low-enriched uranium fuel assembly, while maintaining TREAT's experimental performance capabilities. Zircaloy-4 is being evaluated as TREAT lowenriched uranium assembly material. A preliminary study on the room temperature mechanical properties of asreceived and electron beam welded Zircaloy-4 sheet (1.6 mm) is presented. The sheet was high-vacuum electron beam welded using a three-pass process with varying heat input: (1) tack welding (10.5 J/mm), (2) seams welded (36.7 J/mm), and (3) sealed (15.7 J/mm). As-received and electron beam welded specimens show comparable properties. Zircaloy-4 displays anisotropy between the transverse and longitudinal directions. Tensile properties measured for the transverse direction display higher yield strength, reduction of area, and slightly lower tensile strength and ductility than for the longitudinal (i.e., rolling) direction. Weld and base metal hardness are comparable, while hardness at the heat-affected-zone is slightly higher. Microscopic examinations show distinct microstructure morphology and grain size from weld to base metal. A correlation between welding parameters, mechanical properties, and microstructural features was established for electron beam welded Zircaloy-4 sheet.

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“…The penetration of neutrons into zirconium allows measurement of lattice strains to evaluate the residual stresses as a function of location as is needed to determine stress profiles across a weld. In an exhaustive study, Carr et al determined the residual stresses [90,91] and the strain evolution during loading of the weld in a Zircaloy-4 weld using time-of-flight neutron diffraction from the measured lattice strains and the texture of the material [92]. Figure 7 shows some results of these studies.…”

Section: Residual Stressmentioning

confidence: 99%

A Review of Neutron Scattering Applications to Nuclear Materials

Vogel

2013

ISRN Materials Science

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The growing demand for electric energy will require expansion of the amount of nuclear power production in many countries of the world. Research and development in this field will continue to grow to further increase safety and efficiency of nuclear power generation. Neutrons are a unique probe for a wide range of problems related to these efforts, ranging from crystal chemistry of nuclear fuels to engineering diffraction on cladding or structural materials used in nuclear reactors. Increased flux at modern neutron sources combined with advanced sample environments allows nowadays, for example, studies of reaction kinetics at operating temperatures in a nuclear reactor. Neutrons provide unique data to benchmark simulations and modeling of crystal structure evolution and thermomechanical treatment. Advances in neutron detection recently opened up new avenues of materials characterization using neutron imaging with unparalleled opportunities especially for nuclear materials, where heavy elements (e.g., uranium) need to be imaged together with light elements (e.g., hydrogen, oxygen). This paper summarizes applications of neutron scattering techniques for nuclear materials. Directions for future research, extending the trends observed over the past decade, are discussed.

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Investigation of Grain-Scale Stresses and Modeling of Tensile Deformation in a ZIRCALOY-4 Weldment

Cited by 8 publications

References 21 publications

On the Large Strain Torsion of HCP Polycrystals

On the Large Strain Torsion of HCP Polycrystals

Room temperature mechanical properties of electron beam welded zircaloy-4 sheet

A Review of Neutron Scattering Applications to Nuclear Materials

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