Influence of processing parameters on dynamic recrystallization and the associated annealing twin boundary evolution in a nickel base superalloy

Pradhan, S.K.; Mandal, Sumantra; Athreya, C.N.; Babu, K. Arun; Boer, B. de; Sarma, V. Subramanya

doi:10.1016/j.msea.2017.05.109

Cited by 116 publications

(28 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang et al [7] reported continuously increasing twin boundary fraction with increasing temperature up to 1100 • C, and a saturation at strain rates above 0.01 s −1 at 1160 • C. At higher strain rates (above 1 s −1 , which was the maximum strain rate in [7]) the same group reported that the twin boundary fraction reached a minimum at 1 s −1 and then increased again [56]. A direct connection between DRX grain size and twin boundary fraction was reported by [55], showing that the twin boundary fraction saturated when the DRX grain size reached approximately 5 µm. In the studied system, this DRX grain size corresponded to a fully, or almost fully, recrystallized structure.…”

Section: Twinning and Texture Developmentmentioning

confidence: 77%

“…As both total grain boundary density and twin boundary density decreased (but only the latter was reported) the evolution of their ratio (the twin boundary fraction) is not clear. The difference can be seen in e.g., [55] and [7], where the two measures in many cases show different, or even opposite, behavior. Zhang et al [7] reported continuously increasing twin boundary fraction with increasing temperature up to 1100 • C, and a saturation at strain rates above 0.01 s −1 at 1160 • C. At higher strain rates (above 1 s −1 , which was the maximum strain rate in [7]) the same group reported that the twin boundary fraction reached a minimum at 1 s −1 and then increased again [56].…”

Section: Twinning and Texture Developmentmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Eriksson

Colliander

2021

Metals

View full text Add to dashboard Cite

Thermomechanical processes, such as forging, are important steps during manufacturing of superalloy components. The microstructural development during processing, which controls the final component properties, is complex and depends on e.g., applied strain, strain rate and temperature. In this study, we investigate the effect of process parameters on the dynamic and post-dynamic recrystallization during hot compression of Ni-base superalloy Haynes 282. Specifically, we address the effect of deformation below the grain boundary carbide solvus temperature. During deformation, discontinuous and continuous dynamic recrystallization was observed at the grain boundaries, and particle-stimulated nucleation occurred at primary carbides. Strain rate was determined to be the governing factor controlling the recrystallization fraction for strain rates up to 0.5 s−1 above which adiabatic heating became the dominating factor. Careful examination of the temperature development during deformation showed that the response of the closed-loop temperature control system to adiabatic heating can have important effects on the interpretation of the observed behavior. During a 90 s post-deformation hold, grain growth and an increasing fraction of twin boundaries significantly changed the deformation-induced microstructure and texture. The microstructure developed during post-dynamic recrystallization was mainly controlled by the temperature and only weakly coupled to the prior deformation step.

show abstract

Section: Twinning and Texture Developmentmentioning

confidence: 77%

Section: Twinning and Texture Developmentmentioning

confidence: 99%

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Eriksson

Colliander

2021

Metals

View full text Add to dashboard Cite

show abstract

“…The effect of hot deformation parameters (deformation temperature, strain and strain rate, etc.) on the DRX of polycrystalline γ-γ’ nickel-based superalloys has been extensively investigated [ 4 , 12 , 14 , 15 , 16 ]. It is concluded that DDRX, characterized by serrated and bulging grain boundaries, is the dominant nucleation mechanism of DRX in nickel-based alloy, while CDRX carried out through progressive sub-grain rotation is only an assistant one [ 12 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Sub-Solvus Recrystallization Mechanisms in an Advanced γ-γ’ Nickel-Based Superalloy GH4151

Chen

et al. 2020

Materials

View full text Add to dashboard Cite

Sub-solvus dynamic recrystallization (DRX) mechanisms in an advanced γ-γ’ nickel-based superalloy GH4151 were investigated by isothermal compression experiments at 1040 °C with a strain rate of 0.1 s−1 and various true strain of 0.1, 0.3, 0.5, and 0.7, respectively. This has not been reported in literature before. The electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) technology were used for the observation of microstructure evolution and the confirmation of DRX mechanisms. The results indicate that a new dynamic recrystallization mechanism occurs during hot deformation of the hot-extruded GH4151 alloy. The nucleation mechanism can be described as such a feature, that is a primary γ’ (Ni3(Al, Ti, Nb)) precipitate embedded in a recrystallized grain existed the same crystallographic orientation, which is defined as heteroepitaxial dynamic recrystallization (HDRX). Meanwhile, the conventional DRX mechanisms, such as the discontinuous dynamic recrystallization (DDRX) characterized by bulging grain boundary and continuous dynamic recrystallization (CDRX) operated through progressive sub-grain merging and rotation, also take place during the hot deformation of the hot-extruded GH4151 alloy. In addition, the step-shaped structures can be observed at grain boundaries, which ensure the low-energy surface state during the DRX process.

show abstract

“…The initial grain size distribution at the beginning of the forging process and forging parameters with respect to the temperature, strain rate and maximum strain are systematically varied in order to study the general recrystallization behavior [ 18 , 19 , 20 , 21 ]. The focus is set to the separation of dynamic (DRX) and meta-dynamic (MDRX) recrystallization combined with their kinetics [ 3 , 22 , 23 , 24 , 25 , 26 , 27 ]. The variation in the microstructure is based on simulations with industrially measured process data and is applied in a multi-class grain size model [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Dynamic and Meta-Dynamic Recrystallization Behavior of Forged Alloy 718 Parts Using a Multi-Class Grain Size Model

et al. 2020

View full text Add to dashboard Cite

Dynamic and meta-dynamic recrystallization occur during forging of alloy 718 aircraft parts and thus change the microstructure during a multistep production route. Since the prediction of the resulting grain structure in a single grain fraction is not able to describe microstructures with bimodal or even multimodal distributions, a multi-class grain size model has been deployed to describe the recrystallization mechanisms during thermomechanical treatments and predict the resulting grain size distributions more accurately. As forging parameters, such as temperature, strain rate and maximum strain influence the flow curve and consequently the recrystallization behavior, a series of double cone compression experiments has been carried out and used to verify and adapt the material parameters for the multi-class grain size model. The recrystallized fractions of the numerical and experimental results are compared and differentiated in view of the recrystallization mechanism, i.e., dynamic and meta-dynamic recrystallization. The strong dependence of the recrystallization kinetics on the initial grain size is highlighted, as well as the influence of different strain rates, which shall represent typical forging equipment.

show abstract

Influence of processing parameters on dynamic recrystallization and the associated annealing twin boundary evolution in a nickel base superalloy

Cited by 116 publications

References 60 publications

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Investigation on Sub-Solvus Recrystallization Mechanisms in an Advanced γ-γ’ Nickel-Based Superalloy GH4151

Simulation of Dynamic and Meta-Dynamic Recrystallization Behavior of Forged Alloy 718 Parts Using a Multi-Class Grain Size Model

Contact Info

Product

Resources

About