2006
DOI: 10.1016/j.jnucmat.2006.09.004
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Influence of temperature on threshold stress for reorientation of hydrides and residual stress variation across thickness of Zr–2.5Nb alloy pressure tube

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Cited by 55 publications
(15 citation statements)
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“…Although hydride reorientation is influenced by properties inherent to the alloy such as the degree of cold work, grain microstructure, texture, and others [5][6][7][8][9][10], and by parameters related to the specific thermo-mechanical treatments, such as maximum temperature, dwell time at maximum temperature, cooling rate, and number of thermo-mechanical cycles, the critical parameter is the threshold stress (σ th ) [11][12][13][14][15][16][17][18]. Most of the data on the threshold stress for hydride reorientation in zirconium-base alloys available in the literature has been obtained from uniaxial tension tests [6][7][8][16][17][18][19][20][21][22][23][24]. However, during the vacuum drying process, the thin-wall nuclear fuel cladding tubes are subjected to internal gas pressure and/or pellet clad mechanical interaction (PCMI) that create stress biaxiality ratios (σ 2 /σ 1 ) ≥ 0.5, much higher than that for uniaxial tension (σ 2 /σ 1 = 0) [25].…”
Section: Introductionmentioning
confidence: 99%
“…Although hydride reorientation is influenced by properties inherent to the alloy such as the degree of cold work, grain microstructure, texture, and others [5][6][7][8][9][10], and by parameters related to the specific thermo-mechanical treatments, such as maximum temperature, dwell time at maximum temperature, cooling rate, and number of thermo-mechanical cycles, the critical parameter is the threshold stress (σ th ) [11][12][13][14][15][16][17][18]. Most of the data on the threshold stress for hydride reorientation in zirconium-base alloys available in the literature has been obtained from uniaxial tension tests [6][7][8][16][17][18][19][20][21][22][23][24]. However, during the vacuum drying process, the thin-wall nuclear fuel cladding tubes are subjected to internal gas pressure and/or pellet clad mechanical interaction (PCMI) that create stress biaxiality ratios (σ 2 /σ 1 ) ≥ 0.5, much higher than that for uniaxial tension (σ 2 /σ 1 = 0) [25].…”
Section: Introductionmentioning
confidence: 99%
“…Figure 15 shows the effect of temperature at 90 MPa. As shown in the figure, HRF increases with an increase in temperature, which indicates that the threshold stress for hydride reorientation is not a constant, but rather a function of temperature [29][30][31][32]. In this study, we determined the incipient threshold stress based on the 5% fraction criteria [33].…”
Section: Threshold Stress For Hydride Reorientation At Dry Storage Tementioning
confidence: 97%
“…Hydride reorientation is influenced by properties inherent to the alloy such as the amount of cold work, grain microstructure, and crystallographic texture [3,4,[11][12][13][14]. In addition, the specific influences of thermomechanical parameters such as maximum temperature, dwell time at maximum temperature, cooling rate and number of cycles, and applied stress on the threshold stress for hydride reorientation have been extensively studied [8,9,[15][16][17][18][19]. However, although there is a significant amount of data on the value of the threshold stress to reorient the hydrides during cooling, most of it was obtained under uniaxial tension conditions [4,6,12,17,[20][21][22][23][24], whereas the internal gas pressure creates biaxial stress states with stress biaxiality ratios (r 2 /r 1 % 0.5) that are significantly higher than uniaxial tension (r 2 /r 1 ¼ 0).…”
Section: Introductionmentioning
confidence: 99%
“…In addition, the specific influences of thermomechanical parameters such as maximum temperature, dwell time at maximum temperature, cooling rate and number of cycles, and applied stress on the threshold stress for hydride reorientation have been extensively studied [8,9,[15][16][17][18][19]. However, although there is a significant amount of data on the value of the threshold stress to reorient the hydrides during cooling, most of it was obtained under uniaxial tension conditions [4,6,12,17,[20][21][22][23][24], whereas the internal gas pressure creates biaxial stress states with stress biaxiality ratios (r 2 /r 1 % 0.5) that are significantly higher than uniaxial tension (r 2 /r 1 ¼ 0). Some threshold stress data for hydride reorientation are available from studies using internally pressurized tubes that produce stress states similar to what occurs during vacuum drying [9,15,16]; however, these values vary widely, making a firm comparison to the many threshold stress values obtained from uniaxial testing difficult.…”
Section: Introductionmentioning
confidence: 99%