Flow behavior and microstructures of superalloy 718 during high temperature deformation

Wang, Y.; Shao, Wen‐Zhu; Zhen, Liang; Liu, Yang; Zhang, X.M.

doi:10.1016/j.msea.2008.07.046

Cited by 240 publications

(82 citation statements)

References 26 publications

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“…If the slopes are computed within the same temperature range as mentioned before, the apparent activation energy is approximately 528 kJ/mol. Compared to the previously reported value, for example, 443 kJ/mol by H.Yuan et al [6], 443.2 kJ/mol by Y. Wang et al [7], 400 kJ/mol by S.C. Medeiros et al [8], 423 kJ/mol by M.J. Weis et al [9], activation energy Q in this study is appreciably high, due to the different original microstructure of compress samples. It should be noted from the figure that the scatter increases with increasing strain rate.…”

Section: (C)contrasting

confidence: 79%

Numerical Simulation of Hot Die Forging for IN 718 Disc

Lu¹,

Chen²,

Du³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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Continuous improvements of properties for individual parts are indispensable for perpetual development of aircraft engines. Concerning turbine disc, numerical simulation of forging process is one of the most attractive tools to reduce the cost and time and to improve the properties and the reliability at the same time. In this paper, the hot deformation behavior of IN 718 superalloy has been characterized in the temperature range 900-1020 o C and strain rate range 0.001-0.1 s -1 using isothermal constant strain rate compression tests on process annealed material, with a view to obtain a correlation between grain size and the process parameters. Through a comparison study of two forging methods, temperature-field and strain-field finite element analysis modeling were established, and load-time curves were obtained for a turbine disc under routine and hot die forging process conditions. Results of numerical simulation show that compared to routine forging, hot die forging gives a decrease in total forging force, the temperature-field and strain-field of the turbine disc is more uniform. The effect of cold die on the microstructure is decreased notably under hot die forging condition.

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Section: (C)contrasting

confidence: 79%

Numerical Simulation of Hot Die Forging for IN 718 Disc

Lu¹,

Chen²,

Du³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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“…the coarse grain region and the fine grain region）always occurs; when forging temperature is up to1170ºC (Fig.8b) or above 1150ºC, the uniform grain size distribution is obtained. In other traditional wrought superalloy [7,9], such as IN 718, WASPALOY, etc. the banded structure seldom occurs during their hot working processes.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Primary γ' Distribution on Grain Growth Behavior of GH720Li Alloy

Zhang¹,

Dong²,

Yu³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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In this paper, a series of hot compression tests were carried out under different hot deformation parameters, covering the temperature range of 1000ºC to 1170ºC, strain rate range of 0.01s -1 to 1s -1 and compression reduction of 30%, 50%, and 70%. After that, all specimens were heat treated under the standard heat treatment schedule of GH720Li to investigate its hot deformation characteristics, especially the grain growth behaviors. The further OM and SEM observations were adopted to investigate the interaction mechanism of the primary γ′ distribution and grain growth for GH720Li alloy. The results show that for GH720Li alloy, when hot deformed below γ′ solvus, the banded or bi-model structure always occurs; while hot deformed near or over γ′ solvus, the uniform grain size distribution can be obtained. Further microstructure analysis shows that the bi-model or banded grain size distribution in GH720Li alloy is mainly due to the nonuniform re-dissolving of primary γ′ during heating process; while the uniformity of primary γ′ phase is determined by the uniformity of elements in this alloy. In other word, the homogenizing process for ingot is the key reason for later grain size control.

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“…Different approaches are available to model the plastic deformation. The constitutive models to simulate the plastic deformation, such as the power law [36,37,96,100] and hyperbolic sine law [56,95,99], require model parameters that capture the strain hardening behavior of the alloy. After fitting the experimental data, the effects from material chemistry, geometry, and testing conditions are no longer distinguished by the model parameters, and, therefore, the trained models can only be used under specific conditions.…”

Section: Plastic Deformationmentioning

confidence: 99%

A Computational Framework for Material Design

Kattner

Campbell

2017

Integr Mater Manuf Innov

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A computational framework is proposed that enables the integration of experimental and computational data, a variety of user-selected models, and a computer algorithm to direct a design optimization. To demonstrate this framework, a sample design of a ternary Ni-Al-Cr alloy with a high work-to-necking ratio is presented. This design example illustrates how CALPHAD phase-based, composition and temperature-dependent phase equilibria calculations and precipitation models are coupled with models for elastic and plastic deformation to calculate the stress-strain curves. A genetic algorithm then directs the search within a specific set of composition and processing constraints for the ideal composition and processing profile to optimize the mechanical properties. The initial demonstration of the framework provides a potential solution to initiate the material design process in a large space of composition and processing conditions. This framework can also be used in similar material systems or adapted for other material classes.Keywords Ni-based superalloy · Integrated computational materials engineering · Genetic algorithm · Material design

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Flow behavior and microstructures of superalloy 718 during high temperature deformation

Cited by 240 publications

References 26 publications

Numerical Simulation of Hot Die Forging for IN 718 Disc

Numerical Simulation of Hot Die Forging for IN 718 Disc

The Effect of Primary γ' Distribution on Grain Growth Behavior of GH720Li Alloy

A Computational Framework for Material Design

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Flow behavior and microstructures of superalloy 718 during high temperature deformation

Cited by 240 publications

References 26 publications

Numerical Simulation of Hot Die Forging for IN 718 Disc

Numerical Simulation of Hot Die Forging for IN 718 Disc

The Effect of Primary &gamma;' Distribution on Grain Growth Behavior of GH720Li Alloy

A Computational Framework for Material Design

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The Effect of Primary γ' Distribution on Grain Growth Behavior of GH720Li Alloy