Thermal Fatigue of an Yttrium-Modified Single-Crystal Superalloy

Meyer-Olbersleben, F.; Dörner, Wolfgang; Goldschmidt, D.; Rézaï-Aria, Farhad

doi:10.1007/978-94-011-2860-5_1

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…As generally observed in creep tests of SX-superalloys, the microstrucutre evolves under TF cycling (15,16). Figure 6 shows the evolution of the well-defined y-cubic precipitates of both SX-alloys to a rafted or globular morphology.…”

Section: Resultsmentioning

confidence: 61%

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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Section: Resultsmentioning

confidence: 61%

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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“…In order to improve the high temperature properties, the oxidation resistance has been successfully increased by yttrium addition, even if the temperature of incipient melting and consequently the heat treatment window is thereby reduced [3,4]. CMSX4, a highly strengthened rhenium-containing second-generation single-crystal nickel-base alloy, was modified by adding yttrium during the casting procedure [5]. The material properties were determined by analyzing the results of creep as well as low-cycle and thermomechanical fatigue at elevated temperatures and by investigating the damage micromechanisms involved.…”

Section: Jntroductionmentioning

confidence: 99%

“…aby in weight %, Ni Co W Cr MO Fe Al Ti Ta Hf C Re 60. 5 9.5 6.3 6.4 0.6 0.1 5.5 0.9 6.3 0.08 Y@pm) 0.007 2.9 50-150 Creep strain was continuously monitored using capacitive transducers connected to extensometers clamped to the shoulders of the specimen. Constant load and temperature creep tests were performed in the temperature range 850 -1050°C and at nominal stresses selected to produce rupture times of 100 to 1500 h.…”

Section: Bble 1 Cv4ofymentioning

confidence: 99%

High Temperature Mechanical Properties of CMSX4+Yttrium Single-Crystal Nickel-Base Superalloys SRR 99 and CMX-4

Marchionni¹,

Goldschmidt²,

Maldini³

1992

Superalloys 1992 (Seventh International Symposium)

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CMSX4+Y, a highly strengthened rhenium-containing second generation single-crystal nickel-base superalloy, has been studied by creep as well as low cycle and thermomechanical fatigue in the temperature range of 500°C to 1100°C. The alloy exhibits very good high temperature mechanical properties better or comparable with other single crystal superalloys. The thermomechanical fatigue resistance is comparable with low cycle fatigue one and is cycle-shape dependent.The observation of fracture surfaces shows that fracture induced by creep damage is internal and starts from pore-initiated cracks, while fatigue damage starts on the external surface and propagates inward in stage II mode.

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Evaluation of high- temperature behavior of CMSX4 + yttrium single- crystal nickel- base superalloy

Marchionni

Goldschmidt

Maldini

1993

JMEP

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Thermal Fatigue of an Yttrium-Modified Single-Crystal Superalloy

Cited by 3 publications

References 5 publications

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

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

High Temperature Mechanical Properties of CMSX4+Yttrium Single-Crystal Nickel-Base Superalloys SRR 99 and CMX-4

Evaluation of high- temperature behavior of CMSX4 + yttrium single- crystal nickel- base superalloy

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