Influence of dynamic restoration mechanisms on the hot workability of Waspaloy and concentrated FCC alloys

McQueen, H.J.; Gurewitz, G.; Fülöp, Sándor

doi:10.1080/02619180.1983.11753197

Cited by 17 publications

(12 citation statements)

References 3 publications

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“…[2] and [3]. The determined value of Q is consistent with the value of 410 kJ/mol reported by McQueen et al [10] for hot deformation of Waspaloy in the temperature range of 1173 K to 1473 K (900°C to 1200°C). Figure 3 shows the microstructure of the as-received material.…”

Section: A the Activation Energy For Hot Deformationsupporting

confidence: 78%

“…[9][10][11] The only equation for grain size evolution in Waspaloy during hot deformation is the one proposed by Shen et al [12] obtained from Gleeble compression testing. At the beginning of the current study, attempt was made to compare the measured grain size of isothermally hot compressed Waspaloy with the calculated one using the equation proposed in Reference 12.…”

mentioning

confidence: 99%

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Modeling Grain Size and Strain Rate in Linear Friction Welded Waspaloy

Chamanfar

Jahazi

Gholipour

et al. 2013

Metall Mater Trans A

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The high-temperature deformation behavior of the Ni-base superalloy, Waspaloy, using uniaxial isothermal compression testing was investigated at temperatures above the c¢ solvus, 1333 K, 1373 K, and 1413 K (1060°C, 1100°C, and 1140°C) for constant true strain rates of 0.001, 0.01, 0.1, and 1 s À1 and up to a true strain of 0.83. Flow softening and microstructural investigation indicated that dynamic recrystallization took place during deformation. For the investigated conditions, the strain rate sensitivity factor and the activation energy of hot deformation were 0.199 and 462 kJ/mol, respectively. Constitutive equations relating the dynamic recrystallized grain size to the deformation temperature and strain rate were developed and used to predict the grain size and strain rate in linear friction-welded (LFWed) Waspaloy. The predictions were validated against experimental findings and data reported in the literature. It was found that the equations can reliably predict the grain size of LFWed Waspaloy. Furthermore, the estimated strain rate was in agreement with finite element modeling data reported in the literature.

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Section: A the Activation Energy For Hot Deformationsupporting

confidence: 78%

mentioning

confidence: 99%

Modeling Grain Size and Strain Rate in Linear Friction Welded Waspaloy

Chamanfar

Jahazi

Gholipour

et al. 2013

Metall Mater Trans A

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“…Chamanfar et al [32] calculated the values of Q for subsolvus (950-1020 • C) and supersolvus (1060-1140 • C) deformation for Waspaloy at strain rates ranging from 0.001 s −1 to 1 s −1 as 1400 ± 372 kJ/mol and 462 ± 95 kJ/mol, respectively. The calculated value of Q for Waspaloy (630.17 kJ/mol) is much larger than the values presented by the authors of works [31,33,39] but fits perfectly in the range indicated by the author of [32]. It should be noted, that this value depends on the investigated deformation conditions ranges such as temperature and strain rate.…”

Section: Constitutive Equation and Activation Energy Mapsupporting

confidence: 41%

“…For Waspaloy there is also a discrepancy of this value. Shen et al [31], McQueen et al [33], and Matsui [39] calculated the activation energy for the hot working of Waspaloy as equal to 468 kJ/mol, 410 kJ/mol and 384 kJ/mol respectively. Chamanfar et al [32] calculated the values of Q for subsolvus (950-1020 • C) and supersolvus (1060-1140 • C) deformation for Waspaloy at strain rates ranging from 0.001 s −1 to 1 s −1 as 1400 ± 372 kJ/mol and 462 ± 95 kJ/mol, respectively.…”

Section: Constitutive Equation and Activation Energy Mapmentioning

confidence: 99%

“…Moreover, an important factor is an assessment of the complexity of the hot deformation process, where the crucial role is played by the parameter of deformation activation energy (Q). The activation energy Q for Waspaloy is noted in the literature [31][32][33] as a constant value at variable temperatures and strain rates. However, it is known that the hot-deformation conditions affect this value.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Hot Workability of Nickel-Based Superalloy Using Activation Energy Map and Processing Maps

et al. 2020

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The stress-strain curves for nickel-based superalloy were obtained from isothermal hot compression tests at a wide range of deformation temperatures and strain rates. The material constants and deformation activation energy of the investigated superalloy were calculated. The accuracy of the constitutive equation describing the hot deformation behavior of this material was confirmed by the correlation coefficient for the linear regression. The distribution of deformation activation energy Q as a function of strain rate and temperature for nickel-based superalloy was presented. The processing maps were generated upon the basis of Prasad stability criterion for true strains ranging from 0.2 to 1 at the deformation temperatures range of 900–1150 °C, and strain rates range of 0.01–100 s−1. Based on the flow stress curves analysis, deformation activation energy map, and processing maps for different true strains, the undesirable and potentially favorable hot deformation parameters were determined. The microstructural observations confirmed the above optimization results for the hot workability of the investigated superalloy. Besides, the numerical simulation and industrial forging tests were performed in order to verify the obtained results.

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Effect of internal heating during hot compression on the stress-strain behavior of alloy 304L

Mataya¹,

Sackschewsky²

1994

Metall Mater Trans A

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Influence of dynamic restoration mechanisms on the hot workability of Waspaloy and concentrated FCC alloys

Cited by 17 publications

References 3 publications

Modeling Grain Size and Strain Rate in Linear Friction Welded Waspaloy

Modeling Grain Size and Strain Rate in Linear Friction Welded Waspaloy

Evaluation of Hot Workability of Nickel-Based Superalloy Using Activation Energy Map and Processing Maps

Effect of internal heating during hot compression on the stress-strain behavior of alloy 304L

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