Through-Thickness Deformation Gradient in a Part-Pilgered Zirconium Tube: Experimental Measurements and Numerical Validation

Kumar, Gulshan; Balo, Sandip; Dhoble, Ashish; Singh, Jaiveer; Singh, Ramesh; Srivastava, D.; Dey, G.K.; Samajdar, I.

doi:10.1007/s11661-017-4032-y

Cited by 12 publications

(3 citation statements)

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“…The lattice strain can be both elastic and plastic. Multiple { hkl } grazing incidence XRD (GIXRD) , is an effective means for evaluating stresses. Unlike the standard d sin 2 ψ, which is valid for a single X-ray pole, multiple { hkl } GIXRD covers all available poles and hence can be considered orientation independent.…”

Section: Resultsmentioning

confidence: 99%

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

Goyal

Mukherjee²,

Mallik³

et al. 2019

ACS Appl. Energy Mater.

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Owing to the high thermoelectric (TE) conversion efficiency, low cost, and environmental friendliness Mg 2 Si 0.3 Sn 0.7 solid solution has emerged as the material of choice for the n-leg of a TE generator for midtemperature (room temperature to 800 K) applications. Dimensionless TE figure-of-merit (ZT) values of 1.3 (at 700 K) have been reported in this compound when optimally doped. High ZT values in this compound are due to a combination of improved electrical properties (band convergence effect) and reduced lattice thermal conductivity (alloy scattering of phonons). Here we demonstrate that the TE performance in this solid solution can be improved further (ZT max = 1.7 at T = 673 K, which is a record in silicide-based TE materials) by enhancing phonon scattering with embedded nanoprecipitates. The high ZT values are obtained when Mg 2 Si 0.3 Sn 0.7 is codoped with Bi and Cr. While Bi helps in optimizing the electrical transport properties, Cr results in formation of nanoprecipitates. Transmission electron microscopy (TEM) studies indicate embedded nanoprecipitates rich in elemental Cr and Sn. The nanoprecipitates also result in a strained interface as confirmed from high-resolution TEM (HRTEM) and grazing incidence XRD (GIXRD) studies. This results in an ∼15% reduction in the lattice thermal conductivity (κ L ) compared to the only Bi-doped sample while retaining similar power factor (S 2 σ) values. The overall effect is a ZT eng value of 0.73, which corresponds to a conversion efficiency (η) of 12% with the cold side temperature of 323 K and a ΔT = 350 K.

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Section: Resultsmentioning

confidence: 99%

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

Goyal

Mukherjee²,

Mallik³

et al. 2019

ACS Appl. Energy Mater.

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“…the goniometer with head, with Vantec TM area detector and appropriate video plus laser tracking. Measured, at the centre of the tube cross-section using standard d-sin 2 Ψ 17,18 .Residual stress is measured at Fusion zone of weld material; of the lateral surface on weld samples, for calculation 19 of the residual stress, the following Equation-2 is used.…”

Section: Experimental Workmentioning

confidence: 99%

Effect of Residual Stresses of GTA Welding for Dissimilar Materials

Vemanaboina

Gundabattini

Akella³

et al. 2018

Mat. Res.

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The purpose of the present work is to understand the evolution of residual stresses in weldments. The study made to weld the multipass dissimilar of Nickel-based superalloy Inconel 625 and stainless steel 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) process employing ERNiCrMo-3 and ERNiCr-3 fillers. The L 4 orthogonal array was used in the present experimentation process. Analysis of Variance (ANOVA) is applied for the optimization and to identify the critical parameters. In welding process, the size of the lattice size will be stressed due to welding parameters; the lattice dimension is measured by non-destructive technique X-Ray diffraction to investigate residual stress in the weldment in the lateral surface of the plate. X-Ray Radiography test has evaluated the quality of welds. The results show that root gap is a critical parameter and filler wire and weld processes are not critical.

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“…Kumar et al [18] validated a more complex three-dimensional FE model with extensive experimental data on residual stress gradients. Finally, Kumar et al [19] also modelled the complex metal forming process of zirconium pilgering in terms of residual stress developments.…”

Section: Introductionmentioning

confidence: 99%

Imposed thermal gradients and resultant residual stresses: Physical and numerical simulations

Mukherjee

Tewary

Kumar

et al. 2020

Materials Science and Technology

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In this study, physical simulations were carried out on High Strength Low Alloy (HSLA) steel specimens. Samples were heated above and below the austenite transformation temperature and then cooled at different rates. Thermal history and residual stress gradients were measured experimentally and simulated numerically. This involved finite element simulations, which solved the Fourier's heat conduction equation and also incorporated appropriate subroutines for phase transformations. The latter involved HETVAL, to quantify phase transformation, and USDFLD, to calculate the corresponding heat inputs. This manuscript not only established a similar pattern between the controlled experiments and the numerical simulations but also provided a quantitative perspective to residual stress gradients, as introduced by temperature gradients and by phase transformations, during thermomechanical processing.

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Through-Thickness Deformation Gradient in a Part-Pilgered Zirconium Tube: Experimental Measurements and Numerical Validation

Cited by 12 publications

References 50 publications

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

Effect of Residual Stresses of GTA Welding for Dissimilar Materials

Imposed thermal gradients and resultant residual stresses: Physical and numerical simulations

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Through-Thickness Deformation Gradient in a Part-Pilgered Zirconium Tube: Experimental Measurements and Numerical Validation

Cited by 12 publications

References 50 publications

High Thermoelectric Performance in Mg2(Si0.3Sn0.7) by Enhanced Phonon Scattering

High Thermoelectric Performance in Mg2(Si0.3Sn0.7) by Enhanced Phonon Scattering

Effect of Residual Stresses of GTA Welding for Dissimilar Materials

Imposed thermal gradients and resultant residual stresses: Physical and numerical simulations

Contact Info

Product

Resources

About

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering

High Thermoelectric Performance in Mg₂(Si_0.3Sn_0.7) by Enhanced Phonon Scattering