Hot deformation behavior and processing map of a typical Ni-based superalloy

Wen, Dong-Xu; Lin, Y.C.; Li, Hongbin; Chen, Xiaomin; Deng, Jiao; Li, Leiting

doi:10.1016/j.msea.2013.09.049

Cited by 245 publications

(92 citation statements)

References 59 publications

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“…The decrease in r p with increasing forming temperature is primarily attributed to two reasons. Firstly, mobility of grain boundaries is enhanced at higher temperatures enabling dislocation motion at relatively lower stresses [35]. Secondly, strong dislocation pinning aided by harder c 0 precipitates is retarded at elevated temperatures due to the decreasing volume fraction of c 0 and concomitant morphological changes at elevated temperatures [36].…”

Section: Flow Behaviormentioning

confidence: 99%

Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

et al. 2015

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Hot flow behavior of hot isostatically processed experimental nickel-based superalloy is investigated over temperature and strain rate ranging from 1000-1200°C and 0.001-1 s -1 , respectively by carrying out constant true strain rate isothermal compression tests up to true strain of 0.69. True stress-true strain curves corrected for adiabatic temperature rise exhibited rapid strain hardening followed by flow softening behavior irrespective of temperature and strain rate regimes investigated, although anomalous flow behavior is observed at 1200°C. Variation of peak flow stress with temperature is corroborated to the microstructural changes pertaining to the morphology and relative volume fraction of the phases present. From the experimental results, constitutive model incorporating the effects of strain rate, strain, and temperature is established to describe the hot flow behavior of investigated alloy. Dependence of peak flow stress on strain rate and temperature described by Zener-Hollomon (Z) parameter indicated increase in peak flow stress with Z. Additionally Cingara-Queen equation is employed to predict flow curve up to peak stress. The reliability of developed constitutive models is validated statistically and the results indicate reasonable agreement with experimental findings.

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Section: Flow Behaviormentioning

confidence: 99%

Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

et al. 2015

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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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“…The flow stress decreases with the increasing temperature and the decreasing strain rate. At the early deformation stage, the flow stress increases rapidly with the increase of strain, which results from the work hardening caused by the dislocation generation and multiplication [33]. After a rapid increase, the flow stress begins to increase slowly until the Then, the flow stress tends to decline or maintain a steady state, illustrating a dynamic equilibrium between the work hardening and dynamic softening [34].…”

Section: Hot Compression Testsmentioning

confidence: 99%

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

Yang

Wang

Zhao

et al. 2016

Int J Adv Manuf Technol

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Aluminum profile extrusion involves complex thermal, tribological, and mechanical interactions; thus, material flow and thermal behavior during extrusion process are very complicated. In this work, the material flow and thermal behavior of a 7 × × × aluminum alloy profile during an entire extrusion cycle are investigated numerically and experimentally. Hot compression tests are firstly carried out, and inverse analysis method is used to identify the material parameters of AA7N01 in Arrhenius constitutive model. The calculated global error is only 6.2 % between the predicted and experimental force-displacement curves, which verifies that the proposed model and obtained material parameters can describe well the rheological behavior of this alloy at elevated temperatures. Then a thermo-mechanical finite element model based on DEFROM-3D is built, and the transient extrusion process of the profile is simulated. By numerically analyzing the nose-end shape of the extruded profile, the evolution curves of exit temperature and of extrusion load, material flow and thermal behavior during extrusion process are investigated, respectively. Practical extrusion experiments verify the numerical model and results. Additional microstructure examination with electron backscatter diffraction (EBSD) technique also shows fine grains with the uniform grain size of about 9 μm on different locations of the extruded profile. Therefore, the material constitutive model and numerical model of extrusion process built in this work are capable enough to provide theoretical guidance in optimizing process parameters and designing extrusion dies.Keywords Thermo-mechanical behavior . Transient extrusion process . Arrhenius constitutive model . Inverse analysis method . High-strength 7 × × × aluminum alloy

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Hot deformation behavior and processing map of a typical Ni-based superalloy

Cited by 245 publications

References 59 publications

Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

Constitutive modeling for predicting peak stress characteristics during hot deformation of hot isostatically processed nickel-base superalloy

A Computational Framework for Material Design

Numerical and experimental investigation on thermo-mechanical behavior during transient extrusion process of high-strength 7 × × × aluminum alloy profile

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