Residual Stress Measurement in Socket Welded Joints by Neutron Diffraction.

Hayashi, Makoto; Ishiwata, M.; Minakawa, N.; Funahashi, Satoru

doi:10.2472/jsms.44.1464

Cited by 18 publications

(10 citation statements)

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“…Actually, d0 are measured in small samples, as shown in The axial and radial directional residual strain distributions could not be measured. However, since the residual stress distributions in the weld metal exhibit staticstress-like, 7) the maximum axial residual stress seems to be larger value than the previously measured.…”

Section: Neutron Diffraction Measurementscontrasting

confidence: 58%

“…The authors also examined the spatial distribution of residual stresses in a socket weld in which a short sleeve is aligned and welded to two tubes. 7) The residual stress at the root of the weld metal in the socket welded joints was about 130MPa. This is about 65% of the estimated value from the fatigue test results of as-welded and stressrelieved socket joints.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous experiment, we measured the residual stress distributions in the socket welded specimens in which the axes of socket and pipe was correctly aligned each other. 7) In this study, the effect of misalignment between the socket and the pipe on the maximum axial residual stress was examined. Furthermore, the residual strain distributions near the weld start and end positions, and the principal strains and stresses were also examined.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Miss-alignment on Residual Stress in Carbon Steel Socket Welded Joint

Hayashi¹,

Root²

2014

J. Soc. Mat. Sci., Japan

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Section: Neutron Diffraction Measurementscontrasting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Miss-alignment on Residual Stress in Carbon Steel Socket Welded Joint

Hayashi¹,

Root²

2014

J. Soc. Mat. Sci., Japan

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“…The neutron diffraction technique has also been applied to the stress distribution measurement at the fatigue crack tip of specimens under loaded and unloaded conditions [4]. The authors have examined the residual stress distributions in the structural components and pipes [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Distribution in Water Jet Peened Type 304 Stainless Steel

Hayashi

Okido

Suzuki

2020

QuBS

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In materials with a surface treatment such as shot peening, the residual stress gradient in the surface layer is severe. When measuring the residual stress distribution near the surface with a severe stress gradient by the neutron diffraction method, the gauge volume must be removed from the measurement sample. However, when the gauge volume deviates from the sample, a pseudo peak shift occurs and accurate stress distribution cannot be evaluated. Therefore, it is necessary to evaluate the pseudo peak shift in advance under the same conditions, as in the case of actual residual stress measurement, using a sample in an unstressed state. In this study, the stress distributions in the surface layer of a type 304 stainless steel plate and bar with simulated stress-corrosion cracks which were subjected to water jet peening—giving a surface layer residual stress equivalent better than that of normal shot peening—were evaluated considering the pseudo peak shift. As a result, the residual stress distributions in the surface layer were measured in good agreement with the measurement result obtained by the sequential polishing X-ray diffraction method. It was clarified that the residual stress distribution in the near surface with steep stress gradient can be evaluated by the neutron diffraction method.

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“…Since the elastic constants depend on diffraction planes, Hayashi et al [8] investigated this dependency for ferritic steel and found that the Kröner elastic model [9] can be employed to account for the diffraction plane dependency of the elastic constants and proposed a calculation method for elastic constants using Young's modulus ratio between the investigated polycrystalline material and the single crystal [8]. Hayashi et al also examined the spatial distribution of residual stresses in a socket welded joint and a 4-inch butt welded pipe joint and found a good agreement between the neutron diffraction method and the X-ray diffraction or the strain gauge method [10,11]. The inherent strain analysis and the finite element analysis showed that the residual stress distributions calculated agree well with those measured by the neutron diffraction method except at the stress concentration region [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Residual Stress Relaxation in a Rolled Joint by Neutron Diffraction

Hayashi

Root²,

Rogge

et al. 2018

QuBS

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The rolled joint of a pressure tube, consisting of three axial symmetric parts, modified SUS403 stainless steel as an inner extension, Zr–2.5Nb as the pressure tube and an Inconel-718 outer sleeve has been examined by neutron diffraction for residual stresses. It was heat treated to 350 °C for 30, 130 and 635 h to simulate thermal aging over the lifetime of an advanced thermal reactor respectively for 1, 5 and 30 years at an operating temperature of 288 °C. The crystallographic texture has been investigated from cylindric disks cut from the heat treated Zr–2.5Nb pressure tube to determine the proper sample-orientation-dependent hkl reflections for reliable residual strain measurements. Corresponding in situ tensile deformation was carried out to obtain the necessary diffraction elastic constants for the residual stress evaluation. Three-dimensional crystal lattice strains at various locations in the rolled joint before and after the aging treatments for various times were non-destructively measured by neutron diffraction and the residual stress distribution in the rolled joint was evaluated by using the Kröner elastic model and the generalized Hooke’s law. In the crimp region of the rolled joint, it was found that the aging treatment had a much weaker effect on the residual stresses in the Inconel outer sleeve and the modified SUS403 stainless steel extension. In the non-aged Zr–2.5Nb pressure tube, the highest residual stresses were found near its interface with the modified SUS430 stainless steel extension. In the crimp region of the Zr–2.5Nb pressure tube near its interface with the modified SUS430 stainless steel, the average compressive axial stress was −440 MPa, having no evident change during the long-time aging. In the Zr–2.5Nb pressure tube outside closest to the crimp region, the tensile axial and hoop stresses were relieved during the 30 h of aging. The hoop stresses in the crimp region evolved from an average tensile stress of 80 MPa to an average compressive stress of 230 MPa after the 635 h of aging, suggesting that the rolled joint had a good long-term sealing ability against leakage of high temperature water. In the Zr–2.5Nb pressure tube close to the reactor core and far away from the modified SUS403 stainless steel extension, the residual stresses near the inside surface of the pressure tube were almost zero, helping to keep a good neutron irradiation resistance.

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Residual Stress Measurement in Socket Welded Joints by Neutron Diffraction.

Cited by 18 publications

References 0 publications

Effect of Miss-alignment on Residual Stress in Carbon Steel Socket Welded Joint

Effect of Miss-alignment on Residual Stress in Carbon Steel Socket Welded Joint

Residual Stress Distribution in Water Jet Peened Type 304 Stainless Steel

Evaluation of Residual Stress Relaxation in a Rolled Joint by Neutron Diffraction

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