Threshold Stress Creep Behavior of Alloy 617 at Intermediate Temperatures

Benz, Julian; Carroll, Laura; Wright, J.K.; Wright, Richard N.; Lillo, T.M.

doi:10.1007/s11661-014-2244-y

Cited by 64 publications

(21 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The n value obtained in the present study is similar to the values reported by Benz et al for the temperature range 800-1000°C (n = 5.1-6.9) [10]; however, in Benz's study, the reported value decreased from 6.9 to 5.1 with an increase in the temperature from 800 to 1000°C; in contrast, the obtained value in the present study increases from 5.1 to 6.9 with an increase in the temperature from 850 to 950°C. With regard to the temperature tendency of n, Sharma et al has reported that the value of n increased from 4.38 to 9.68 with an increase in the temperature from 800 to 900°C, and then decreased to 6.29 with a further increase in the temperature to 1000°C [11].…”

Section: Analysis Of Creep Rupture Behaviorsupporting

confidence: 92%

“…On the contrary, the value of Q = 360 (kJ/mol) is lower than those for bulk specimens tested in pure helium environment, 408 (kJ/mol) and for Alloy 617 plate at 800 to1000°C, 410 (kJ/mol) [10]. However, Q = 360 (kJ/mol) obtained in the present study is consistent with the Q value of 320 to 500 (kJ/mol) previously reported for Alloy 617 [10,24]. Wide variations of activation energy values for Alloy 617 are interpreted because the secondary creep stage was unclear as "non-textbook creep" behavior, Fig.…”

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 71%

“…This value for Q is higher than that for lattice-self diffusion of nickel, 284 (kJ/mol) [22,23], for Alloy 617 foils at 800 to 1000°C, 271 (kJ/mol) [11], and for bulk specimens tested in He + CH 4 environment, 309 (kJ/mol) [12]. On the contrary, the value of Q = 360 (kJ/mol) is lower than those for bulk specimens tested in pure helium environment, 408 (kJ/mol) and for Alloy 617 plate at 800 to1000°C, 410 (kJ/mol) [10]. However, Q = 360 (kJ/mol) obtained in the present study is consistent with the Q value of 320 to 500 (kJ/mol) previously reported for Alloy 617 [10,24].…”

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 89%

“…It can be inferred that the similar values of n and n′ resulted from the same creep deformation and fracture mechanisms. Most metallic materials in the stress range 10 −4 b σ / E b 10 −2 follow the power-law creep with stress exponent ≈5, and an approximate value of n = 5 implies dislocation glide and climb creep mechanism, which falls in the range of stress exponent typically observed for class II alloys [10,11].…”

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 95%

“…In Eq. (10), the constants A 1 and n 1 are experimentally determined, and the quantity Z is the "Zener-Hollomon parameter" [10,21].…”

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 99%

See 4 more Smart Citations

Creep deformation and rupture behavior of Alloy 617

Kim

Park

Ekaputra

et al. 2015

Engineering Failure Analysis

View full text Add to dashboard Cite

Section: Analysis Of Creep Rupture Behaviorsupporting

confidence: 92%

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 71%

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 89%

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 95%

“…In Eq. (10), the constants A 1 and n 1 are experimentally determined, and the quantity Z is the "Zener-Hollomon parameter" [10,21].…”

Section: Analysis Of Creep Rupture Behaviormentioning

confidence: 99%

See 3 more Smart Citations

Creep deformation and rupture behavior of Alloy 617

Kim

Park

Ekaputra

et al. 2015

Engineering Failure Analysis

View full text Add to dashboard Cite

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

View full text Add to dashboard Cite

The influences of the size and shape of the γ 0 phase and the type and distribution of carbides on the fracture behavior of a new Ni-Cr-Fe superalloy subjected to four different solution aging treatments are examined. The γ 0 phase and γ matrix of the L1 2-ordered structure maintain a coherent orientation relationship on the {100} and {110} atomic planes according to transmission electron microscopy observations. The material becomes stronger because the movement of dislocations is hindered by the γ 0 phase and MC (Nb-rich, Ti-rich) and M 23 C 6 (Cr-rich, Mo-rich) carbides. The two-stage aging system (850 C Â 4 h þ 730 C Â 4 h) substantially increases the size of the γ 0 phase. The solid solution sample shows a microporous-aggregated ductile fracture, and the solution-aged samples show a microporous-aggregated crystalline fracture according to scanning electron microscopy observations. The fracture mechanism is also discussed.

show abstract

Evolution of Microstructure during Creep Deformation in a Forged 617 Superalloy

Hamid,

Singh,

Rawat

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

Creep tests are conducted on forged 617 M superalloy samples at 650, 700, and 750 °C at stresses ranging from 115 to 320 MPa. At 650 °C, a significant steady‐state secondary creep is observed, while at 700 and 750 °C limited secondary creep and prolonged tertiary creep are observed. Creep data analysis using power‐law creep approach estimates high‐stress exponents (n ≈ 13.4 at 650 °C, ≈11.5 at 700 °C, and ≈9.7 at 750 °C) and activation energy (Q ≈ 530.6 kJ mole−1). After incorporating threshold stress, the activation energy for creep is found to be ≈261 kJ mole−1. This is consistent with the activation energy for lattice self‐diffusion in the alloy. Transmission electron microscopy provides evidences affirming that climb‐controlled dislocation creep may be the operative creep mechanism. Ni3(Al, Ti) (γ′) precipitates and M23C6 carbides evolve during exposure at operating temperatures. These are observed to lead to enhanced creep resistance at 700 °C. Significant coarsening rate of γ′ precipitates are noted during exposure at 750 °C. This intensifies recovery processes and lowers creep threshold stress drastically. Extended tertiary creep prevails near the service conditions of this alloy, which is ascribed to instability in microstructure during creep.

show abstract

Threshold Stress Creep Behavior of Alloy 617 at Intermediate Temperatures

Cited by 64 publications

References 34 publications

Creep deformation and rupture behavior of Alloy 617

Creep deformation and rupture behavior of Alloy 617

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

Evolution of Microstructure during Creep Deformation in a Forged 617 Superalloy

Contact Info

Product

Resources

About