Constitutive models for high-temperature flow behaviors of a Ni-based superalloy

Lin, Y.C.; Wen, Dong-Xu; Deng, Jiao; Guan, Lan; Chen, Jian

doi:10.1016/j.matdes.2014.02.041

Cited by 176 publications

(70 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the variations of the frequency of [10][11][12][13][14][15] o grain boundaries with the variations of thermo-deformation parameters are not obvious. Because the CDRX mechanism often results in the increased frequency of [10][11][12][13][14][15] o grain boundaries, it can be concluded that the major dynamic recrystallization mechanism of the studied superalloy is DDRX. Fig.…”

Section: Flow Softening Behaviormentioning

confidence: 99%

“…In recent years, the hot deformation behaviors of some typical nickel-based superalloys were investigated. On the one hand, Lin et al [15,16,17], Kumar et al [18], Zuo et al [19], Yang et al [20], Azarbarmas et al [21], and Liu et al [22] developed various accurate constitutive models to predict the flow stress of some typical superalloys. Considering the synthetical effects of deformation temperature, strain, strain rate, and initial δ phase on the hot deformation behaviors of GH4169 superalloy, Lin et al [23,24] proposed the improved phenomenological constitutive model.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

Self Cite

View full text Add to dashboard Cite

The flow softening behaviors of a nickel-based superalloy with δ phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD), optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s−1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s−1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of δ phase (Ni3Nb).

show abstract

Section: Flow Softening Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…For modeling of flow curve up to r p , Cingara-Queen [29] relation is employed, which is found to be appropriate for explaining the stress-strain characteristics in the WH regime [30] for nickel-base superalloys. The equation is expressed below:…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…In the case of nickel-based superalloys possessing low stacking fault energy [33], dynamic softening mechanisms are likely to proceed slowly. As deformation progresses, dominance of WH characteristics is partly countervailed by the softening mechanisms and with continuous increase in dislocation density, DRX commences after the attainment of critical strain [30]. Finally, dynamic equilibrium is attained between WH and dynamic softening mechanisms ensuing steady-state flow stress with increasing strain.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Therefore, the constitutive equation built according to the parameters of strain 0.4 is not representative over the all strain situations. The compensation of strain should be taken into account when computing the material constants (A, α, n and Q) so that the flow stress can be predicted more accurately [32,39,40].…”

Section: Modified Constitutive Modelmentioning

confidence: 99%

Hot Deformation Behaviour of Cu/Al Laminated Composites under Interface Constraint Effect

Liu¹,

Wang²,

Liang³

et al. 2018

Preprint

View full text Add to dashboard Cite

Abstract:In order to understand the hot deformation behavior of novel Cu/Al laminated composites, isothermal hot compression tests were conducted by Gleeble-1500D thermo-mechanical simulator. And the effect of bonding interface, deformation temperature and strain rate on the deformation behavior was analyzed. Results show that under the interface constraint effect, soft Al layer trends to flow synchronously with hard Cu layer. And further microstructure examinations indicate the cooperative deformation capability of Cu/Al composites increases with increasing stain rate and decreasing deformation temperature. Strain hardening exponent, calculated based on the true stress-true strain data, also proves the effect of deformation temperature and strain rate on the cooperative deformation behavior. Meanwhile, unique composites structure allows the Al matrix to exhibit the characteristic of dynamic recrystallization during the hot deformation process. Lastly, strain compensated Arrhenius-type constitutive equation was employed to describe the coupling effect of temperature, strain rate and strain on the flow stress. Key words: Cu/Al laminated composites; deformation behavior; interface; microstructure; constitutive equation IntroductionWith the rapid development of modern industry, light-weight is an intense pursuit goal for more economical and green development at the basis of keeping original mechanical properties. Copper/aluminum (Cu/Al) laminated composites have been developed to meet these demands and several fabricate methods also have been presented in recent years [1][2][3][4][5]. Practices indicate that compared to monometallic copper or copper alloy, Cu/Al composites can reduce the weight of 40 ~ 50 %, save the cost of 30 ~ 50 % and keep almost consistent electrical and thermal conductivity [6]. Therefore, Cu/Al laminated composites have been utilized in a number of areas such as power, communication, architecture and aerospace [5,7]. Until now, numerous studies about Cu/Al composites are mainly focused on the fabricate technologies [1][2][3][4][5], thermal treatment crafts [8][9][10] and bonding mechanisms [11,12]. However, thermal mechanical machining such as hot rolling and tension also are necessary for Cu/Al composites in order to meet various industrial needs, to the authors' knowledge, related research is not available.For the hot deformation behavior of metal materials, the essence is dynamic competition between work hardening and dynamic softening (including dynamic recrystallization and dynamic recovery), and the process is significantly affected by deformation temperature, strain rate, microstructure and so on [13]. Until now, Arrhenius-type constitutive equation is a kind of commonly used mathematical model to describe the relationship between the flow stress and deformation temperature, strain rate and deformation activation energy during the hot deformation process [14]. And the hot deformation behaviors of constituent metals of Cu/Al laminated composites have been investigated respectively thro...

show abstract

Constitutive models for high-temperature flow behaviors of a Ni-based superalloy

Cited by 176 publications

References 67 publications

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

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

Hot Deformation Behaviour of Cu/Al Laminated Composites under Interface Constraint Effect

Contact Info

Product

Resources

About