Hot working characteristics and dynamic recrystallization of delta-processed superalloy 718

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

doi:10.1016/j.jallcom.2008.06.079

Cited by 93 publications

(36 citation statements)

References 22 publications

(30 reference statements)

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“…11a). The bands are oriented at about 45°with respect to the principal stress axis [13,14]. The same phenomenon was observed in compression tests of the other nickel-based alloys such as Hastelloy X superalloy [6], Inconel 718 [13], and Inconel 690 [16].…”

Section: Processing Mapsupporting

confidence: 73%

“…Processing maps have been used for the characterization and optimization of hot workability in many Ni-based superalloys such as Inconel 718, Inconel MA 754, Inconel 690, nimonic 75, nimonic 80A, nimonic 90, Haynes 230 [13][14][15][16][17][18]. Processing maps of the Inconel 625 produced by powder metallurgy routes were successively developed by Medeiros and workers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on hot workability characteristics of Inconel 625 superalloy using processing maps

Guo

et al. 2012

J Mater Sci

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Hot compression tests of the commercial Inconel 625 were performed in the temperature range of 950-1200°C and strain rate range of 0.01-10 s -1 . The flow behavior and processing maps were investigated using the corrected flow stress data to eliminate effects of the friction and adiabatic heating. The processing maps have exhibited a domain in the temperature range of 1100-1200°C and strain rate range of 0.01-10 s -1 corresponding to the higher efficiency of power dissipation. Microstructural observations reveal that the full dynamic recrystallization (DRX) occurs in this domain, which is optimum processing window for hot working to obtain a homogeneous microstructure. DRX grain growth occurs in the temperature range of 1150-1200°C and strain rate range of 0.01-0.1 s -1 . In view of the refined and uniform grains obtained by hot deformation, the finish forming processing should be selected the deformation conditions in which the full DRX occurs without the grain growth. The small regimes of flow instability are noticed at temperature below about 970°C at the different strains. The material undergoes flow instability manifesting as bands of flow localizations and high density deformation twins. In addition, it is found that the undissolved second-phase particles and carbides can promote the DRX processing and be helpful to restrict the DRX grain growth.

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Section: Processing Mapsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Investigation on hot workability characteristics of Inconel 625 superalloy using processing maps

Guo

et al. 2012

J Mater Sci

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“…In addition, it is found that new grain would nucleate near the d phase (Figure 8(a)), which agrees with the previous result that the d phase can stimulate the occurrence of dynamic recrystallization. [38] Thus, it is indicated that the lack of d phase may be responsible for grain growth in those previous investigations. [22][23][24] Although the grain size reduction was observed by Huang and Blackwell, [26] it was attributed to the increasing LAGBs, instead of the dynamic recrystallization.…”

Section: A Microstructural Characteristicsmentioning

confidence: 81%

Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

Huang

Hua

et al. 2015

Metall Mater Trans A

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The superplastic behavior of Inconel 718 superalloy with particular emphasis on the microstructural evolution has been systematically investigated through tensile tests at the strain rate of 10 À3 s À1 and the temperatures ranging from 1223 K to 1253 K (950°C to 980°C). Its elongations exceeded 300 pct under all of the experimental conditions and peaked a maximum value of 520 pct at 1223 K (950°C). Moreover, the stress reached the top value at the strain of 0.3, and then declined until the tensile failure. In addition, we have found that the grain size reduced after deformation while the d phase precipitation increased. Microstructural evolution during the superplasticity was characterized via transmission electron microscope, and the randomly distributed dislocation, dislocation network, dislocation arrays, low-angled subgrains, and high-angled recrystallized new grains were observed in sequence. These new grains were found to nucleate at the triple junction, twin boundary, and near the d phase. Based on these results, it is deemed that the discontinuous dynamic recrystallization occurred as the main mechanism for the superplastic deformation of Inconel 718 alloy.

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“…Sui has constructed the processing map using compression tests for a Inconel 718 alloy which is a typical Ni-Febased superalloy ( Ref 14). Wang studied the hot working characteristics and DRX behavior for a delta-processed 718 superalloy in order to improve the strength and low-cycle fatigue properties; the processing maps were also established ( Ref 15,16). Ning investigated the DRX behavior for a Ni-Cr P/M superalloy FGH96.…”

Section: Introductionmentioning

confidence: 99%

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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Hot working characteristics and dynamic recrystallization of delta-processed superalloy 718

Cited by 93 publications

References 22 publications

Investigation on hot workability characteristics of Inconel 625 superalloy using processing maps

Investigation on hot workability characteristics of Inconel 625 superalloy using processing maps

Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

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

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