Impact of Thermomechanical Aging on Alloy 625 High Temperature Mechanical Properties

Suave, Lorena Mataveli; Bertheau, D.; Cormier, Jonathan; Villechaise, Patrick; Soula, Aurélie; Hervier, Zéline; Hamon, Florence; Laigo, Johanne

doi:10.1002/9781119016854.ch26

Cited by 11 publications

(7 citation statements)

References 24 publications

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“…11), which shows the decrease in the strengthening γ″-phase content and the increase in the brittle δ-phase content. Suave et al[40,41] obtained a similar result in alloy 625 samples that the microhardness reached a peak value after a 1000 hours thermal exposure at 650 o C and a subsequent small decrease was observed when increasing the exposure up to 2000 hours, which was attributed to the overaging and the onset of γ″→δ transformation occurring at this temperature for very long exposures.For the cold-rolled samples aged by procedure B, it is unrealistic to employ an equation/function for describing the variations in the hardness, which is due to the freshly recrystallized grain microstructure replacing the initial grain microstructure. However, the variations in the hardness of different degrees cold-rolled samples aged by procedure B can be roughly attributed to two aspects.…”

supporting

confidence: 51%

Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy

Mei

Liu

et al. 2015

Journal of Alloys and Compounds

118

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supporting

confidence: 51%

Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy

Mei

Liu

et al. 2015

Journal of Alloys and Compounds

118

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“…7(b) elucidates the evolution of Ti-rich carbides/carbo-nitrides and scarce, needle-shaped -Ni3Nb in the FZ after subjecting to 100 h aging. According to Suave et al [20], the precipitation domain of the -Ni3Nb phase is approximately 650 to 900C after prolonged aging time. However, the existence of  phase could be noticed scarcely in the grain boundaries of the FZ along with M23C6 and M6C carbides.…”

Section: Characterization Of Microstructurementioning

confidence: 99%

Effect of grain boundary precipitation on the mechanical integrity of EBW joints of Inconel 625

Mulimani

Ankit

Kothari

et al. 2021

Materials Science and Engineering: A

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“…The solidus temperature was calculated as 1137 • C according to the Scheil module in Thermo-Calc [32]. The flow stress for the annealed state of the material was compiled from stress-strain curves from various sources [33][34][35], as indicated in Table 2. The flow stress was tabulated versus plastic strain and temperature, which was used to interpolate flow stress and hardening of the material.…”

Section: Materials Modelsmentioning

confidence: 99%

History Reduction by Lumping for Time-Efficient Simulation of Additive Manufacturing

Malmelöv

Lundbäck

Lindgren

2019

Metals

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Additive manufacturing is the process by which material is added layer by layer. In most cases, many layers are added, and the passes are lengthy relative to their thicknesses and widths. This makes finite element simulations of the process computationally demanding owing to the short time steps and large number of elements. The classical lumping approach in computational welding mechanics, popular in the 80s, is therefore, of renewed interest and is evaluated in this work. The method of lumping means that welds are merged. This allows fewer time steps and a coarser mesh. It was found that the computation time can be reduced considerably, with retained accuracy for the resulting temperatures and deformations. The residual stresses become, to a certain degree, smaller. The simulations were validated against a directed energy deposition (DED) experiment with alloy 625.a thermo-mechanical model where whole layers were added simultaneously when a part with 50 layers was built. This model was validated against an experiment. Keller et al. [17,18] described a model where several layers were added simultaneously. With their model they were able to predict deformation and residual stresses at the macroscopic level. In the current work the temperature and deformation evolution is studied when the passes are added transiently, and only lumped in the build direction. To the authors' knowledge there is no publication where the approach has been used in this way. The inherent strain method is another approach for fast prediction of the resulting deformation and residual stress in AM processes [19,20]. The method was first proposed for welding by Ueda and coworkers [21][22][23]. Li et al. [24,25] used the inherent strain approach, but instead of using strain, a residual stress tensor is added to each layer in the mechanical macro-scale model. The simulation was performed with a multi-scale model in three different scales. A micro-scale model was used to predict an equivalent heat source, which was the input to the meso-scale model. Because the AM process is very fast, it was assumed that the heat could be added to the whole layer simultaneously. In the thermo-mechanical meso-scale model, a residual stress tensor from one added layer was calculated.Finally, the mechanical model on the macro-scale was computed, wherein the material was added layer by layer and the pre-determined residual stress tensor was applied on each added layer. The drawback with the inherent strain method is that it often requires calibration. The inherent strains are in general sensitive to changes in the boundary conditions.The main aim of this work was to study the method lumping of welds, described above, and evaluate the error introduced in the modeling and the achieved reduction in computation time for the simulations. A detailed thermo-mechanical FE model was validated with in situ temperature and displacement measurements for directed energy deposition (DED) with alloy 625. All experimental data and results that are used for comparison with the sim...

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Impact of Thermomechanical Aging on Alloy 625 High Temperature Mechanical Properties

Cited by 11 publications

References 24 publications

Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy

Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy

Effect of grain boundary precipitation on the mechanical integrity of EBW joints of Inconel 625

History Reduction by Lumping for Time-Efficient Simulation of Additive Manufacturing

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