Texture Characterization of Stainless Steel Cladded Layers of Process Vessels

Rebelo-Kornmeier, Joana; Gan, Weimin; Marques, Maria José; Batista, A. C.; Hofmann, M.; Loureiro, A.

doi:10.4028/www.scientific.net/msf.879.1588

Cited by 5 publications

(15 citation statements)

References 13 publications

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“…Two model settings were considered: (a) a free model ε(z) curve determined by six (z j , ε j ) nodes, and (b) a model, where the strain at the surface was constraint to the value derived from the XRD measurement with the remaining values down to 15 mm depth being freely adjustable parameters as in the previous case. It is worth noting that the experimental error bars are not derived from the fitting uncertainties of peak positions alone, but were calculated considering extra random uncertainty contribution from the grain size statistics due to the coarse grain nature of the weld material [39]. Very good agreement of the fits with the experimental data was achieved in both cases; however, the respective deconvoluted (intrinsic) strain profiles shown in Fig.…”

Section: Neutron Diffractionmentioning

confidence: 80%

Effects of finish turning on an austenitic weld investigated using diffraction methods

Rebelo-Kornmeier

Hofmann

Gan

et al. 2020

Int J Adv Manuf Technol

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Arc welding generally introduces undesired local residual stress states on engineering components hindering high-quality performance in service. Common procedures to reduce the tensile residual stresses are post-heat treatments or mechanical surface treatments like hammering or shot-peening. Assessments of residual stress profiles of post-weld treatments underneath the weld surface are essential, especially in high safety exigency systems like pressure vessels or piping at power plants. In this study, neutron diffraction is used to determine the stress profile after finish milling of an austenitic steel weld in order to verify a chained finite element simulation predicting the final residual stress fields including milling and welding contributions. Non-destructive measurements with spatial resolutions of less than 0.2 mm within the first 1 mm from the surface were mandatory to confirm the finite element simulations of the coarse-grained austenitic material. In the data analysis procedure, the obtained near-surface data have been corrected for spurious strain effects whenever the gauge volume was partially immersed in the sample. Moreover, constraining the surface data to values obtained by x-ray diffraction and data deconvolution within the gauge volume enabled access of the steep residual stress profile within the first 1 mm.

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Section: Neutron Diffractionmentioning

confidence: 80%

Effects of finish turning on an austenitic weld investigated using diffraction methods

Rebelo-Kornmeier

Hofmann

Gan

et al. 2020

Int J Adv Manuf Technol

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“…The experiments of welding pressure vessel steel plate with stainless steel cladded layers were conducted by Rebelo Kornmeier [1]. The samples were made from an EN 10028-3 (P355 NH) carbon steel plate of 20 mm thickness.…”

Section: Methodsmentioning

confidence: 99%

“…The three main directions, longitudinal (LD), transverse (TD) and normal (ND), of the welding plates were represented in Figure 1 (a). After texture measurements and orientation distribution functions (ODFs) calculation using the measured complete pole figures with harmonic series expansion method, with the calculated C-coefficients, the tri-axial Young modulus were calculated using Cub_PHY program based on a cluster model [1]. The Young modulus (local and bulk) values of all samples were plotted in Figure 1 (b~d) for the different directions and the different layers.…”

Section: Methodsmentioning

confidence: 99%

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Anisotropic elastic constants calculation of stainless steel cladded layers of pressure vessel steel plate

Xue

Bouchard

Chen

et al. 2019

International Journal of Pressure Vessels and Piping

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Cladding stainless steel layer on the inner surface of ferrite pressure vessel is a common method to improve the corrosion resistance and save the economic cost. However, the movement of heat source and temperature gradient in the process of cladded welding will lead to the anisotropy of cladded layer material. When measuring the residual stress of pressure vessel steel plate with stainless steel cladded layers by contour method, it is necessary to know the elastic mechanical properties of stainless steel cladded layers accurately. The assumption of transversely isotropy was employed, and the relationship between the material compliance matrix and the elastic modulus of transversely isotropic material was utilized. Based on the elastic modulus of each cladded layer and the whole steel plate from the longitudinal direction (0°) until the transverse direction (90°) measured by the experiment, the independent constants S11, S13, S33 and S44 in the compliance matrix of each cladded layer and the whole steel plate were obtained by regression analysis method. Furthermore, by using the relationship between the independent constants of the stiffness matrix of the transversely isotropic material and the single crystal material, the independent constants S12 in the compliance matrix of each stainless steel cladded layer and the whole steel plate were obtained. And then the independent constants of the stiffness matrix of each cladded layer and the whole steel plate were acquired. Hence, a method for calculating the anisotropic elastic constants of the stainless steel cladded layer and the whole steel plate was proposed. The results will provide material data support for measuring residual stress of pressure vessel steel plate with stainless steel cladded layers by contour method.

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“…Nevertheless, both diffraction methods may still be very localized, especially when coarse grain materials must be analyzed, such as in this study, concerning welds of austenitic steels, with dendrites spanning several millimeters. Large grain size or the crystallographic texture of the material make it difficult to quantify residual stresses, either by XRD [8] or using neutron diffraction [9]. Another big issue using the neutron diffraction method is the determination of the reference value.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Residual Stress Relief by Heat Treatments in Austenitic Cladded Layers

et al. 2022

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The effect of the heat treatment on the residual stresses of welded cladded steel samples is analyzed in this study. The residual stresses across the plate’s square sections were determined using complementary methods; applying diffraction with neutron radiation and mechanically using the contour method. The analysis of the large coarse grain austenitic cladded layers, at the feasibility limits of diffraction methods, was only made possible by applying both methods. The samples are composed of steel plates, coated on one of the faces with stainless steel filler metals, this coating process, usually known as cladding, was carried out by submerged arc welding. After cladding, the samples were submitted to two different heat treatments with dissimilar parameters: one at a temperature of 620 °C maintained for 1 h and, the second at 540 °C, for ten hours. There was some difference in residual stresses measured by the two techniques along the surface of the coating in the as-welded state, although they are similar at the welding interface and in the heat-affected zone. The results also show that there is a residual stress relaxation for both heat-treated samples. The heat treatment carried out at a higher temperature showed sometimes more than 50% reduction in the initial residual stress values and has the advantage of being less time consuming, giving it an industrial advantage and making it more viable economically.

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Texture Characterization of Stainless Steel Cladded Layers of Process Vessels

Cited by 5 publications

References 13 publications

Effects of finish turning on an austenitic weld investigated using diffraction methods

Effects of finish turning on an austenitic weld investigated using diffraction methods

Anisotropic elastic constants calculation of stainless steel cladded layers of pressure vessel steel plate

Quantification of Residual Stress Relief by Heat Treatments in Austenitic Cladded Layers

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