Thermal Fatigue of Mar‐m509 Superalloy—i. The Influence of Specimen Geometry

Rézaï-Aria, Farhad; François, Manuel; Rémy, Luc

doi:10.1111/j.1460-2695.1988.tb01181.x

Cited by 37 publications

(6 citation statements)

References 8 publications

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“…Some discrepancy occurs at the lowest strain range. Precipitation of M,, C, carbides is observed during T F over the same temperature range [12] and can induce a slight hardening at the lower temperatures. As the mechanical strain range decreases, time to failure increases and a more abundant precipitation could occur and give rise to extra-hardening.…”

Section: Stress-strain Behaviourmentioning

confidence: 81%

Thermal‐mechanical Fatigue of Mar‐m 509 Superalloy. Comparison With Low‐cycle Fatigue Behaviour

Franclois

Rémy

1991

Fatigue Fract Eng Mat Struct

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The thermal-mechanical fatigue behaviour of a cast cobalt based superalloy, MAR-M 509 was investigated. Hollow smooth specimens were submitted to temperature cycling between 600 and 1050°C. The mechanical strain vs temperature cycle shows a diamond shape with peak strains at intermediate temperatures. The stress-strain behdViOUr as well as fatigue life curves are reported. A significant part of total life is spent in crack initiation. Comparison with isothermal low cycle fatigue was made at the temperature where peak strains occurred. Isothermal low cycle fatigue life to crack initiation was shown to give a conservative estimate of thermal mechanical fatigue life provided extra strains due to differences in thermal expansion coeficients of the oxide scale and base alloy were taken into account.11s

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Section: Stress-strain Behaviourmentioning

confidence: 81%

Thermal‐mechanical Fatigue of Mar‐m 509 Superalloy. Comparison With Low‐cycle Fatigue Behaviour

Franclois

Rémy

1991

Fatigue Fract Eng Mat Struct

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“…The axi-symmetric specimens such as Glenny's disc or stepped disc (12) would not be convenient samples for TF investigations of SX-superalloys, due to the anisotropic mechanical behaviour of these alloys. The TF tests are carried out on self-constraint singleedge wedge specimens with edge radius (R) of 0.25 mm (6,7). Their cross section is shown in Figure 3.…”

Section: Suecimens Preparationmentioning

confidence: 99%

“…Thermal fatigue (TF) behaviour of SX-superalloys, despite its key role, is less reported in the open literature. Laboratory TF tests on simple samples such as Glenny's tapered disc (5) and single (6,7) or double-edge wedge specimens (8) have provided a realistic simulation of service conditions of polycrystalline real components. Nevertheless, there are no records of any measured transient thermal and mechanical strains in these specimens for polycrystalline as well as SX-alloys.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Fatigue Behaviour of Single-Crystal Nickel-Based Superalloys SRR 99 and CMSX-4

Meyer-Olbersleben¹,

Goldschmidt²,

Rézaï-Aria³

1992

Superalloys 1992 (Seventh International Symposium)

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Thermal fatigue (TF) behaviour in the low-modulus cool> direction of a new generation nickel-based single-crystal superalloy containing rhenium, CMSX-4 and a highly strengthened first generation one, SRR 99 is investigated. Both superalloys are subjected to comparative thermal fatigue testing. Thermal fatigue tests are performed on self-constraint single-edge wedge specimens. The transient mechanical strains within the thin edge tip of the TF specimens are measured and the anisothermal Manson-Coffin life curves are established. The effect of the maximum temperature, Tmax, in the thermal cycles is evaluated from 1100 to 1175°C. Under identical test conditions a comparable crack propagation rate is observed for both single-crystal alloys. CMSX-4 has a good resistance to oxide-scale spalling. In CMSX-4 cracks initiate from small pores which have formed during solidification in interdendritic regions. In SRR 99, crater-like regions from where the crack can initiate, are formed by a mechanism of successive oxide-scale spalling and re-oxidation of the base alloy. The higher resistance of the oxide-scale in CMSX-4 to spalling combined with the higher strength of the corresponding y depleted zone improves its TF crack initiation resistance in comparison with SRR 99.

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“…When used as turbine components, cobalt-base superalloys are subjected to cyclic thermal stress caused by the temperature gradients occurring during start-up, thrust change and shutdown of aircraft engines. Repetition of such thermal stress results in thermal fatigue of the alloy [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Intrinsic Relationship Between Microstructure Evolution and Thermal Fatigue Behavior of a Single-Crystal Cobalt-Base Superalloy

Gui

Zhang

Yang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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The intrinsic relationship between the microstructure evolution and thermal fatigue behavior of a single-crystal cobalt-base superalloy has been investigated. The thermal fatigue tests are performed cyclically between room temperature and 1050°C using V-notch plate specimens. Three states of thermal fatigue specimens are selected: the as-cast, solutionized as well as aged states. The solution treatment is carried out at 1260°C for 24 h, which results in the dissolution of most of interdendritic continuous primary carbides. The subsequent aging treatment is carried out at 1100°C for 100 h after solution treatment, resulting in the precipitation of a profusion of chain-and point-like M 23 C 6 carbides in the matrix. The results indicate that the heat treatment can improve the thermal fatigue properties of the alloy and the effect of the solution treatment is more prominent than that of the aging treatment. The coarse and continuously distributed primary carbides in the as-cast state are changed into small and discontinuous distribution by heat treatment, which is the dominant factor in the improvement of thermal fatigue property. Additionally, the effect of oxidation behavior during thermal fatigue test on the thermal fatigue behavior is also studied.

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Thermal Fatigue of Mar‐m509 Superalloy—i. The Influence of Specimen Geometry

Cited by 37 publications

References 8 publications

Thermal‐mechanical Fatigue of Mar‐m 509 Superalloy. Comparison With Low‐cycle Fatigue Behaviour

Thermal‐mechanical Fatigue of Mar‐m 509 Superalloy. Comparison With Low‐cycle Fatigue Behaviour

Investigation of the Thermal Fatigue Behaviour of Single-Crystal Nickel-Based Superalloys SRR 99 and CMSX-4

The Intrinsic Relationship Between Microstructure Evolution and Thermal Fatigue Behavior of a Single-Crystal Cobalt-Base Superalloy

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