Hot deformation behavior and processing map of a γ′-hardened nickel-based superalloy

Zhang, Hongbin; Zhang, Kaifeng; Zhou, Lu; Zhao, Changhong; Yang, Xinliang

doi:10.1016/j.msea.2014.03.015

Cited by 97 publications

(29 citation statements)

References 28 publications

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“…At high temperature and low strain rate, i.e., 1200°C and 0.001 s À1 , the growth of recrystallized grains would decrease the g value. This phenomenon is similar with previous researches about the superalloys ( Ref 6,8,20). In the deformation area with high temperature and low strain rate, the g value for superalloys is general low because of the growth of recrystallized grains, weakening the fining effects of DRX.…”

Section: Microstructural Observationssupporting

confidence: 90%

Characterization of Hot Deformation Behavior of Hastelloy C-276 Using Constitutive Equation and Processing Map

Zhang

Shen

et al. 2014

J. of Materi Eng and Perform

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In order to clarify the microstructural evolution and workability of Hastelloy C-276 during hot forming to get excellent mechanical properties, the hot deformation behavior of this superalloy is characterized. The cylindrical specimens were isothermal compressed in the temperature range of 1000-1200°C and strain rate range of 0.001-5 s 21 on a Gleeble 1500 thermal-mechanical simulator. The flow curves and microstructural investigation indicates that dynamic recrystallization is the prime softening mechanism at the evaluated deformation conditions. The constitutive equation was presented as a function of the deformation temperature, strain rate, and strain, and the deformation activation energy was about 450 kJ/mol. The processing maps based on dynamic materials model at the strains of 0.2, 0.4, 0.6, 0.8, and 1.0 were established, and the processing map at 1.0 strain shows good correspondence to the microstructural observation. The domains in processing map in which the efficiency of power dissipation (g) is higher than 0.25 are corresponding to sufficient dynamic recyrstallization phenomenon, which are suggested to be the optimum working areas for Hastelloy C-276.

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Section: Microstructural Observationssupporting

confidence: 90%

Characterization of Hot Deformation Behavior of Hastelloy C-276 Using Constitutive Equation and Processing Map

Zhang

Shen

et al. 2014

J. of Materi Eng and Perform

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“…Sellars-Tegart relation is successfully employed to explain the constitutive flow behavior during hot deformation of various materials including titanium alloys [26] and nickel-based superalloys [27]. Due to poor reliability in describing flow behavior in high stress regimes and low temperature regions by employing power law and exponential equations, respectively, [28] hyperbolic sine relation alone (Eq.…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…Deformation at elevated temperature is characterized by competing mechanisms of WH and dynamic softening phenomena like DRV and DRX. During early stages of deformation, WH prevails over softening mechanisms such as DRV resulting in rapid increase in [27]. In the case of nickel-based superalloys possessing low stacking fault energy [33], dynamic softening mechanisms are likely to proceed slowly.…”

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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“…After dynamic softening had taken place, it led to an offset of work hardening effect. In other words, flow stresses decreased monotonically to higher strain because the effect of work hardening could be partially neutralized by the occurrence of dynamic softening mechanisms [8][9]. At last, the flow stresses, that gradually decreased, approached a steady state because of dynamic recrystallization during hot deformation [10].…”

Section: Flow Behaviormentioning

confidence: 99%

“…Extensive investigations according to dynamic recovery and dynamic recrystallization of alloys have been focused on the study of flow stress behavior under different deformation condition and microstructure evolutions by optical microscope [6][7][8][9][10][11][12]. Most recent works analyzed correlations between developed microstructures and stress-strain responses.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and strain rate during hot compression of manganese aluminum bronze

Wannaprawat¹,

Subhakom²,

Suranuntchai³

2016

Proceedings of the 2016 International Conference on Innovative Material Science and Technology (IMST 2016)

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Abstract. Manganese Aluminum Bronze or MAB alloy has been extensively used for applications under sea water such as marine propellers because this alloy exhibits high strength as well as excellent corrosion resistance behavior. In this work, microstructures and hardness properties of an annealed MAB alloy after hot deformation at different temperatures of 973 K -1123 K and strain rates between 0.1s -1 and 1 s -1 were investigated. During the tests, stress-strain responses of the alloy were determined, and effects of temperature and strain rate on the flow behavior of the MAB alloy were subsequently examined. Furthermore, microstructures of deformed MAB alloy were characterized by both optical microscopy and scanning electron microscopy. Effect of microstructure on stress-strain curves was illustrated for various forming conditions. The results showed at different temperature and strain was found dynamic recovery and dynamic recrystallization.

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Hot deformation behavior and processing map of a γ′-hardened nickel-based superalloy

Cited by 97 publications

References 28 publications

Characterization of Hot Deformation Behavior of Hastelloy C-276 Using Constitutive Equation and Processing Map

Characterization of Hot Deformation Behavior of Hastelloy C-276 Using Constitutive Equation and Processing Map

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

Effects of temperature and strain rate during hot compression of manganese aluminum bronze

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