Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment

Yaghi, A.H.; Hyde, T H; Becker, A.A.; Sun, Wei

doi:10.1243/03093247jsa372

Cited by 120 publications

(67 citation statements)

References 20 publications

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“…By equating Eq.1 and Eq.2, the value of A can be extrapolated at the required temperature from the value at a known temperature. The extrapolation was conducted assuming the stress exponent 'n' did not change with temperature [29,30]. The creep constants for the materials at 650 • C are given in Table 7.…”

Section: Finite Element Analysismentioning

confidence: 99%

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Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment

Venkata¹,

Khayatzadeh²,

Achouri

et al. 2018

Materials Performance and Characterization

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Dissimilar metal welds are often required in nuclear power plants to join components made from austenitic steels to those from ferritic steels, particularly in fast breeder reactor plants to join the intermediate heat exchanger to the steam generator. The process of welding alters the microstructure of the base materials and also causes residual stresses to form, both due to the change in the microstructure and the differing thermal histories in various regions. Post-weld heat treatment (PWHT) is required to relieve the residual stresses and achieve preferable microstructural gradients across the weld joint. Therefore, in order to arrive at the optimal PWHT process, it is necessary to investigate the effects of heat treatment on the joint integrity, microstructure and residual stress relaxation in the welds.To investigate this effect of PWHT on the residual stress relaxation and corresponding alteration of microstructure across a welded joint, a dissimilar weld between modified 9Cr-1Mo (P91) steel and austenitic stainless steel AISI 316LN was made using autogenous electron beam (EB) welding. To achieve this, the welding process was first modelled numerically using finite element analysis and the residual stress predictions were validated with experimental investigation using neutron diffraction. The validated model was then used to study the residual stress relaxation through the simulation of PWHT. The predicted stress relaxation was compared with contour method measurement of residual stresses in the actual welded plate subjected to PWHT. The results indicate that albeit some relaxation of residual stresses during PWHT, there is still a significant portion of highly localised residual stresses left in the specimen.

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Section: Finite Element Analysismentioning

confidence: 99%

“…The creep constants for the materials at 650 • C are given in Table 7. The temperature dependent material properties and stress-strain response for base materials were taken from literature [29,30,34] and shown in Table 3 to 6.…”

Section: Finite Element Analysismentioning

confidence: 99%

Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment

Venkata¹,

Khayatzadeh²,

Achouri

et al. 2018

Materials Performance and Characterization

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show abstract

“…Similar studies have been carried out, for a P91 steel, in order to develop a creep constitutive model with a damage capability [3]. The development of these creep constitutive models have contributed to the gaining of a better understanding of the material behaviour in such applications as welding process modelling [4] and failure prediction in multiaxial components [5].…”

Section: Introductionmentioning

confidence: 96%

Thermal-mechanical fatigue simulation of a P91 steel in a temperature range of 400–600°C

Saad

Hyde

Sun

et al. 2011

Materials at High Temperatures

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk 1 Thermal-mechanical fatigue simulation of a P91 steel in a temperature range of 400-600˚C AbstractThis paper deals with the identification of material constants to simulate the effect of cyclic mechanical loading and temperatures. A Chaboche viscoplasticity model was used in this study to model the thermal-mechanical behaviour of a P91 martensitic steel. A fully-reversed cyclic mechanical testing programme was conducted isothermally between 400 and 600˚C with a strain amplitude of 0.5%, to identify the model constants using a thermo-mechanical fatigue (TMF) test machine. Thermo-mechanical tests of P91 steel were conducted for two temperature ranges of 400 to 500˚C and 400 to 600˚C. From the test results, it can be seen that the P91 steel exhibits cyclic softening throughout the life of the specimens, for both isothermal and thermal-mechanical loading and this effect can be modelled by the set of viscoplasticity constants obtained. Finite element simulations of the test specimens show good comparison to isothermal and TMF experimental data.

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“…He [3] established the temperature field finite element numerical simulation model of twin arc movement; the loading form of the twin arc with a double ellipsoid heat source was discussed; and the laws of molten pool characteristics influenced by the welding speed, current and voltage of the twin-arc submerged arc welding parameters were analyzed. Yaghi [4] conducted finite element simulation of thermal and residual welding stresses in the specific heat of a material. Das [5] developed a model of the heat transfer during welding by the Element Free Galerkin (EFG) method, and demonstrated the effectiveness and utilities of the EFG method for modeling and understanding the heat transfer processes in arc welding.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Yang

Xiao

et al. 2017

Applied Sciences

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Abstract:The thermo-elastic fracture problem and equations are established for aluminium alloy Metal Inert Gas (MIG) welding, which include a moving heat source and a thermoelasticity equation with the initial and boundary conditions for a plate structure with a crack. The extended finite element method (XFEM) is implemented to solve the thermo-elastic fracture problem of a plate structure with a crack under the effect of a moving heat source. The combination of the experimental measurement and simulation of the welding temperature field is done to verify the model and solution method. The numerical cases of the thermomechanical parameters and stress intensity factors (SIFs) of the plate structure in the welding heating and cooling processes are investigated. The research results provide reference data and an approach for the analysis of the thermomechanical characteristics of the welding process.

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Finite element simulation of welding and residual stresses in a P91 steel pipe incorporating solid-state phase transformation and post-weld heat treatment

Cited by 120 publications

References 20 publications

Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment

Examining Stress Relaxation in a Dissimilar Metal Weld Subjected to Postweld Heat Treatment

Thermal-mechanical fatigue simulation of a P91 steel in a temperature range of 400–600°C

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

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