Validation of a numerical model used to predict phase distribution and residual stress in ferritic steel weldments

Hamelin, Cory J.; Muránsky, Ondrej; Smith, Marcus; Holden, T. M.; Luzin, Vladimir; Bendeich, Philip J.; Edwards, L.

doi:10.1016/j.actamat.2014.04.045

Cited by 81 publications

(48 citation statements)

References 39 publications

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“…By explicitly considering these kinetics using the subroutine developed by Hamelin et al (2014), the analyst may also examine the post-weld ferritic phase distributions across the weld. This assessment is valuable in that it provides an additional level of (2017) xxx-xxx model validation, and can also alert the analyst to any undesirable phases in the weldment (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The thermo-physical and thermo-mechanical material properties used were temperature-dependent data from the recent work of Hamelin et al (2014).…”

Section: Methodsmentioning

confidence: 99%

“…The boundary conditions included the effect of gravity and the prevention of rigid body motion. A subroutine developed at the Australian Nuclear Science and Technology Organisation (ANSTO) was used to explicitly predict anisothermal SSPT phenomena (Hamelin et al, 2014). The results were validated against the ND WRS measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Case 1 has been previously validated (Hamelin et al, 2014) on the same ferritic steel, in the case of a single-pass autogenous GTAW edge beam weld. This case was considered to be a relatively complete approach for modelling the welding of ferritic steels, incorporating thermometallurgical effects combined with TP.…”

Section: Cases Examinedmentioning

confidence: 99%

“…It is furthermore reported that the details of any implementation of SSPT kinetics can significantly affect the accuracy of the model. However, the impact of transformation plasticity is not clearly confirmed (Hamelin et al, 2014).…”

Section: Introductionmentioning

confidence: 97%

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The impact of transformation plasticity on the electron beam welding of thick-section ferritic steel components

Vasileiou

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Balakrishnan

et al. 2017

Nuclear Engineering and Design

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a b s t r a c tWelding is an important process used during the construction and maintenance of nuclear reactor components. Welding results in residual stresses, distortions and microstructural changes in the joined components, which can have significant and deleterious effects on their in-service performance. It is thus crucial for engineers to effectively predict these effects.Ferritic steels undergo solid-state phase transformations (SSPT) during heating and cooling, thus making welding simulation challenging. The strains associated with SSPTs can also cause transformation-induced plasticity. The significance of transformation plasticity for single-pass, autogenous welding of a thick component is the subject of this paper.Electron beam (EB) welding was the technique chosen to weld 30-mm thick ferritic steel plates using a single pass. The welded plates were instrumented with thermocouple arrays, to capture the far-field and near-field thermal transients on the top and bottom surfaces during welding and the cooling down process. Welding distortions were subsequently measured using laser profilometry. Distributions of the developed residual stresses were measured using the neutron diffraction (ND) method.Numerical finite element analysis (FEA) was used to simulate the welding process. After calibrating the thermal solution using thermocouple data, mechanical analysis was conducted using three different approaches: (i) taking account of anisothermal SSPT kinetics with transformation plasticity; (ii) taking account of anisothermal SSPT kinetics without transformation plasticity; and (iii) assuming isothermal SSPT kinetics. The predicted residual stresses and structural distortions are compared to the experimental data, thus assessing the influence of different SSPT phenomena.

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Section: Discussionmentioning

confidence: 99%

“…The thermo-physical and thermo-mechanical material properties used were temperature-dependent data from the recent work of Hamelin et al (2014).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Cases Examinedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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The impact of transformation plasticity on the electron beam welding of thick-section ferritic steel components

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Nuclear Engineering and Design

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Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Zhao

et al. 2022

Int J Adv Manuf Technol

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L-beam is a widely used structural steel. The study of the three-stage bending deformation mechanism of L-beam under non-uniform cooling conditions is of great significance to ensure the quality, improve the yield of steel and reduce the stress level in the finished L-beam. However, it is difficult to investigate experimentally due to the high temperature and simultaneous changes of various influencing factors during the air-cooling process of the L-beam. Numerical simulation provides a convenient and feasible method to study the bending deformation mechanism of the L-beam. In order to investigate the effects of phase transformation and cooling shrinkage on the bending deformation of AH36 L-beam, a three-dimensional thermalmetallurgical-mechanical coupling model was established in this study, the microstructure distribution, hardness，strain, deformation status and stress during the air-cooling of L-beam were calculated. The results show that the microstructure distribution and deformation condition calculated by the model considering the phase transformation effect better agree with the actual situation. Considering the phase change effect is the key to improving the accuracy of the model calculation. The change of heat transfer coefficient caused by phase transformation affects the deformation tendency of the L-beam, while the transformation strain affects the amount of deformation of the L-beam. The alternating changes in the sum of the transformation strain and the cooling shrinkage strain result in a change of stress state which ultimately also results in a three-stage bending deformation of the L-beam.

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Improving the prediction accuracy of thermal finite element analysis for laser welding through an automated optimization method

Rong

2022

Int J Adv Manuf Technol

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Validation of a numerical model used to predict phase distribution and residual stress in ferritic steel weldments

Cited by 81 publications

References 39 publications

The impact of transformation plasticity on the electron beam welding of thick-section ferritic steel components

The impact of transformation plasticity on the electron beam welding of thick-section ferritic steel components

Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Improving the prediction accuracy of thermal finite element analysis for laser welding through an automated optimization method

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