Effect of heat treatment on microstructure and residual stress fields of a weld multilayer austenitic steel clad

Marques, Maria José; Ramasamy, Anandkumar; Batista, A. C.; Nobre, J. P.; Loureiro, A.

doi:10.1016/j.jmatprotec.2015.03.004

Cited by 40 publications

(13 citation statements)

References 19 publications

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“…Most measurements on clad pressure vessel steel presented in the literature are throughthickness measurements and so the compressive near-surface stresses, for example shown in Figure 9, are not commonly reported. However, similar compressive surface stresses have been previously measured in milled and polished 309/316 stainless steel cladding using ICHD and X-ray diffraction [35]. As welded Post-weld heat-treated…”

Section: Residual Stress In As-welded and Post-weld Heat-treated Matesupporting

confidence: 73%

Redistribution of residual stress by thermal shock in reactor pressure vessel steel clad with nickel alloy

Oliver

Mostafavi

Hosseinzadeh

et al. 2019

International Journal of Pressure Vessels and Piping

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This paper characterises the residual stress in nuclear reactor pressure vessel steel clad with nickel-based alloy and investigates the interaction between residual and thermal stresses during thermal shock. Residual stress measurements were made on two plates of SA508 Grade 4N steel, clad with Alloy 82 nickel-based alloy. The techniques used to measure the residual stresses were: deep hole drilling, centre hole drilling, and the contour method. One plate was as-welded, the other post-weld heat-treated. The post-weld heat-treated plate was subjected to thermal shock by heating it up and then spraying the surface of the cladding with cold water. The residual stress was measured again afterwards. A finite element simulation was made to investigate the physical mechanisms causing residual stress redistribution during thermal shock. Thermal shock caused significant residual stress redistribution in the cladding due to elastic-plastic interaction between the thermal stress and the cladding residual stress. The results demonstrate that an assessment of the safety of a reactor pressure vessel during thermal shock could be conservative for small surface defects if it is assumed that residual and thermal stresses combine elastically.

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Section: Residual Stress In As-welded and Post-weld Heat-treated Matesupporting

confidence: 73%

Redistribution of residual stress by thermal shock in reactor pressure vessel steel clad with nickel alloy

Oliver

Mostafavi

Hosseinzadeh

et al. 2019

International Journal of Pressure Vessels and Piping

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“…The neck surface radius (), which also occurs in the di erential equations, can be determined from Eq. (10). The modeling constants of silver nanoparticles for the sintering process are listed in Table A.1 in the appendix.…”

Section: Nanoparticles DI Usion Modelingmentioning

confidence: 99%

“…As a result, determining the mechanical properties of the thin lm is of prime importance to gain an insight into failure modes of the printed microelectronic circuits and optimize process parameters, accordingly, to minimize potential structural failure. These e ects have been explored in previous research work, both experimentally and theoretically [1][2][3][4][5][6][7][8][9][10][11][12][13]. Greer and Street [1,2] investigated residual stresses, Young's modulus, hardness and variation of thickness, and the density and resistivity of sintered silver nanoparticles, experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al modeled the thermal residual stresses of ZrO 2 /(ZrO 2 +Ni) sandwich ceramics using simulation and experimental research [9]. Marques et al examined the e ect of heat treatment on the microstructure and residual stress elds of a weld multilayer experimentally [10]. Wang et al also assessed the mechanical behavior of multilayer systems in heating and cooling phases, and determined their residual stresses using FEM [11].…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of material properties, residual stress and crack development in sintered silver nano-layers on silicon substrate

et al. 2016

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In order to improve the performance of thin lm devices, it is necessary to characterize their mechanical, as well as electrical, properties. In this work, a model is developed for analysis of the mechanical and electrical properties and the prediction of residual stresses in thin lms of silver nanoparticles deposited on silicon substrates. The model is based on inter-particle di usion modeling and nite element analysis. Through simulation of the sintering process, it is shown how the geometry, density, and electrical resistance of the thin lm layers are changed by sintering conditions. The model is also used to approximate the values of Young's modulus and the generated residual stresses in the thin lm in the absence and presence of cracks in the lm. The results are validated through comparing them with available experimental data.

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“…In pad-welding technology, there are also interesting studies on cladding the parent material with several layers of different materials. However, due to the low thickness of the obtained coating and the depth of HAZ, the stress analysis of these examples cannot be referred to as typical padding welds [6]. Thin layers of padding welds, in cases in which the area of the base material is much larger, are characterized by a small thermal influence on this area.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Stress Analysis for the Different Widths of Padding Welds

Kulawik

Wróbel

2020

SV-JME

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In the presented study, the cases of regeneration of the element made of C45 steel, using the MAG (Metal Active Gas) method are analysed. The base material is applied to the regeneration process. The analysis of the influence of the padding weld width (0.006 m, 0.01 m, 0.014 m) and the preheating temperature on the phase transformations and effective stresses of the regenerated layer are performed. A non-standard approach to preheating (before each padding weld after the cooling to ambient temperature) is considered. Due to the possibility of simplifying the model from 3D to 2D (symmetry of calculations for long padding welds), calculations were performed using the finite element method in the transverse to the padding direction. Each new padding weld was included as an additional area in the finite element mesh. The developed numerical model includes a temperature model, phase transformations in the liquid and solid states, and the stress model in the elastic-plastic range. The aim of the regeneration is not only to obtain the original geometry of the element, but it is also important that the filler material used (in the considered case identical to the base material) has appropriate properties. These properties largely depend on the phase composition. The used filler material affects not only the hardness, brittleness, and ductility of the material. Its kinetics and changes in the geometry can cause significant stresses and even cracks. Based on the obtained results, it can be concluded that increasing the width of the padding welds causes a decrease in the level of residual effective stress; however, it is technologically difficult to accomplish. The most unfavourable stresses occur in the initial area of the pad welding zone. For lower preheating temperatures and smaller welds, areas with possible cracks are identified. In these cases, lower preheating and tempering should be carried out, which leads to similar energy costs as at higher preheating temperatures. Due to the complex phase transformation process for medium carbon steels and the need for the process parameters control, proper regeneration is possible only in automated workstations. Keywords: computational mechanics, numerical simulation, padding weld, preheating, strain analysis, stress

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Effect of heat treatment on microstructure and residual stress fields of a weld multilayer austenitic steel clad

Cited by 40 publications

References 19 publications

Redistribution of residual stress by thermal shock in reactor pressure vessel steel clad with nickel alloy

Redistribution of residual stress by thermal shock in reactor pressure vessel steel clad with nickel alloy

Numerical study of material properties, residual stress and crack development in sintered silver nano-layers on silicon substrate

Numerical Study of Stress Analysis for the Different Widths of Padding Welds

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