The effect of strain distribution on microstructural developments during forging in a newly developed nickel base superalloy

Buckingham, R. C.; Argyrakis, C.; Hardy, Mark; Birosca, S.

doi:10.1016/j.msea.2015.12.042

Cited by 68 publications

(22 citation statements)

References 42 publications

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“…During past years, simulationhas been developed as a powerful tool in designing a forging process. Physical simulation was employed to examine the distribution of Mises stress during compressing a nickel‐based superalloy Buckingham et al combined the Deform 3D simulation and experiment to establish the effect of strain distribution on microstructural developments during forging a nickel‐base superalloy . In this research, Deform 3D was employed to obtain the distribution of strains in specimen, together with EBSD to characterize the microstructural features.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

Liu

Huang

et al. 2016

Adv Eng Mater

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Hot compression tests on a newly designed hot extrusion Nickel-based powder metallurgy superalloy are conducted at various deformation conditions. The contact friction coefficient (f) between the die and forged part is determined as 0.30-0.40 by analyzing the results of simulation and the real experiment. A new coefficient B is introduced to evaluate the bulging levels and relate the value of f. The critical strains to prevent peripheral cracks are found to relate closely to the processing parameters. Thermally induced porosity and MC type carbides of grain boundaries are the primary mechanism for inducing cracks. Examinations on microstructure of cracking demonstrate that the cracks propagate along grain boundaries. A model is proposed to illustrate the formation of fractures during hot forging.

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Section: Introductionmentioning

confidence: 99%

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

Liu

Huang

et al. 2016

Adv Eng Mater

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“…The volume fraction of recrystallized grains decreased with reducing deformation temperature [32]. In a recent report, it was suggested that 1.3 mm/mm is a minimum strain required to achieve 100% recrystallization in V207M nickel base superalloy subjected to isothermal forging [33]. However, the results of this study suggest that similar level of strain (i.e., e = 1-1.5) is not enough to achieve 100% recrystallized grains in the forged AD730.…”

Section: Texturementioning

confidence: 99%

Effect of strain level on the evolution of microstructure in a recently developed AD730 nickel based superalloy during hot forging

Konkova

Rahimi

Mironov

et al. 2018

Materials Characterization

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Design and control of microstructure of engineering parts made from nickel based superalloys with superior mechanical properties for high temperature applications, require the parts to be subjected to certain thermomechanical processing during forging. This often includes sequential straining and annealing at elevated temperatures followed by subsequent aging heat treatments at lower temperatures. In this study, the effect of strain magnitude on the evolution of microstructure during hot forging of a recently developed AD730 nickel based superalloy has been investigated. Microstructural heterogeneity was observed in a forged material manifested in a form of large non-recrystallized grains within the recrystallized matrix that is observed to be dependent on the level of deformation (i.e. strain magnitude). Analyses of microstructure indicated significant reduction in the fraction of low-angle grain boundaries and substructures with an increase in the applied strain, suggesting higher fraction of recrystallization with higher levels of strains. It was concluded that the lower strain levels were insufficient to provide enough driving force for complete recrystallization throughout the entire microstructure of the forged material.

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“…The main multi-directional forging (MDF) problem is a strain inhomogeneity. As a result, an inhomogeneous grain structure forms in bulk material [21][22][23][24]. The grain structure consists of very fine grains and coarse grains in pure Al subjected to multi-directional forging at room temperature [25,26].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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The effect of strain distribution on microstructural developments during forging in a newly developed nickel base superalloy

Cited by 68 publications

References 42 publications

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

Effect of strain level on the evolution of microstructure in a recently developed AD730 nickel based superalloy during hot forging

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

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