Numerical investigation of formation mechanism of welding residual stress in P92 steel multi-pass joints

Li, Suo; Ren, Shengnan; Zhang, Yanbin; Deng, Dean; Murakawa, Hidekazu

doi:10.1016/j.jmatprotec.2017.01.033

Cited by 73 publications

(20 citation statements)

References 20 publications

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“…The residual stress profiles on the plate surface were measured by XRD method after TIG welding. XRD method is widely used in the residual stress testing [13,22,23]. The locations of the residual stress measurement and three thermocouples are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Dong

Gao

2018

Acta Metall. Sin. (Engl. Lett.)

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The residual stress evolution in a safe-end/nozzle dissimilar metal welded joint of CAP1400 nuclear power plants was investigated in the manufacturing process by finite element simulation. A finite element model, including cladding, buttering, post-weld heat treatment (PWHT) and dissimilar metal multi-pass welding, is developed based on SYSWELD software to investigate the evolution of residual stress in the aforementioned manufacturing process. The results reveal a large tensile axial residual stress, which exists at the weld zone on the inner surface, leads to a high sensitivity to stress corrosion cracking (SCC). PWHT process before dissimilar metal multi-pass welding process has a great influence on the magnitude and distribution of final axial residual stress. The risk of SCC on the inner surface of the pipe will increase if PWHT process is not taken into account. Therefore, such crucial thermal manufacturing process such as cladding, buttering and post-weld heat treatment, besides the multi-pass welding process, should be considered in the numerical model in order to accurately predict the distribution and the magnitude of the residual stress.

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Section: Methodsmentioning

confidence: 99%

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Dong

Gao

2018

Acta Metall. Sin. (Engl. Lett.)

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“…Jian Lin et al have measured the stress magnitudes in the lap joint of P92 steel by the XRD method [19]. The influence of martensitic transformation on residual stress in the weldment of P92 steel is examined by Suo Li et al by hole drilling and XRD method [20]. As the distribution of welding residual stress in the weldment is complex and purely heterogeneous in nature over the length, it is complicated and costly to measure the variation in the stress field with respect to temperature gradient over a large area of interest by any experimental measurement technique.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructural Changes on Residual Stress Characteristics and Macro-Hardness of Submerged Arc Welded P-91 Steel Plates

et al. 2021

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In this study, the submerged arc welded butt joint of P-91 ferritic-martensitic alloy steel plates has been chosen to examine the influence of microstructural changes on welding residual stress characteristics and macrohardness in the weldment with two different heat input 2497.5 J/mm & 2040J/mm respectively. The stress magnitudes at a different location on the welded specimen are measured by X-ray diffraction technique at the postweld heat-treated condition. Compressive stresses are observed in the weld zone (WZ) and tensile stresses are detected at the boundary of the heat-affected zone (HAZ) near the weld zone. Higher compressive stresses are found in the weld zone of both the specimens where maximum hardness values are observed. Different grain matrix in the microstructure contributes significantly towards the quality of weldment. Residual stress, as well as the hardness of weldment, is found to be influenced by the martensite phase transformation and dissolution of precipitates. A modeling concept is presented for dimensional analysis of martensite structure. Energy dispersive X-ray indicates the distribution of carbides at the grain boundaries. Optical micrograph substantiates the presence of δ-ferrite in the WZ.

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“…In recent years, many methods have been used to measure residual stress, but their accuracy has not been sufficient. In addition, some simulations have been developed to analyze the final distribution of residual stress [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Welding Residual Stresses within Cladding and Substrate during Electroslag Strip Cladding

Qin

Cheng

et al. 2020

Materials

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Hydrogenation reactors are important oil-refining equipment that operate in high-temperature and high-pressure hydrogen environments and are commonly composed of 2.25Cr–1Mo–0.25V steel. For a hydrogenation reactor with a plate-welding structure, the processes and effects of welding residual stress (WRS) are very complicated due to the complexity of the welding structure. These complex welding residual stress distributions affect the service life of the equipment. This study investigates the evolution of welding residual stress during weld-overlay cladding for hydrogenation reactors using the finite element method (FEM). A blind hole method is applied to verify the proposed model. Unlike the classical model, WRS distribution in a cladding/substrate system in this study was found to be divided into three regions: the cladding layer, the stress-affected layer (SAL), and the substrate in this study. The SAL is defined as region coupling affected by the stresses of the cladding layer and substrate at the same time. The evolution of residual stress in these three regions was thoroughly analyzed in three steps with respect to the plastic-strain state of the SAL. Residual stress was rapidly generated in Stage 1, reaching about −440 MPa compression stress in the SAL region at the end of this stage after 2.5 s. After cooling for 154 s, at the end of Stage 2, the WRS distribution was fundamentally shaped except for in the cladding layer. The interface between the cladding layer and substrate is the most heavily damaged region due to the severe stress gradient and drastic change in WRS during the welding process. The effects of substrate thickness and preheat temperature were evaluated. The final WRS in the cladding layer first increased with the increase in substrate thickness, and then started to decline when substrate thickness reached a large-enough value. WRS magnitudes in the substrate and SAL decreased with the increase in preheat temperature and substrate thickness. Compressive WRS in the cladding layer, on the other hand, increased with the increase in preheat temperature.

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Numerical investigation of formation mechanism of welding residual stress in P92 steel multi-pass joints

Cited by 73 publications

References 20 publications

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Influence of Microstructural Changes on Residual Stress Characteristics and Macro-Hardness of Submerged Arc Welded P-91 Steel Plates

Evolution of Welding Residual Stresses within Cladding and Substrate during Electroslag Strip Cladding

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