Thermal Fatigue Anisotropy of the Oxide Dispersion Strengthened Nickel Base Superalloy Inconel MA 760

deMestral, Bernard; Eggeler, Gunther; Merk, N.

doi:10.1007/978-94-011-2860-5_32

Cited by 1 publication

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“…But since it is easier to produce conventional DS microstructures than it is to produce SX materials, especially in large geometric dimensions, there still is considerable interest in large grain DS superalloys, mainly for turbine blades in land-based gas turbines [16]. This is why DeMestral and co-workers [17,18] [19] and performed creep experiments with specimens with a properly characterized grain structure. This technique allowed to differentiate between creep properties of the material in longitudinal and perpendicular direction (with respect to the direction of the elongated macrograins) and provided information on (i) how much deviation from the ideal 100b growth direction is tolerable and (ii) how grain morphology is associated with the scatter in creep rupture lives [17 ± 20].…”

Section: Introductionmentioning

confidence: 99%

"Direkte Bewertung der Kriechfestigkeit einer gerichtet erstarrten Turbinenschaufel mittels Minikriechproben

Kolbe

Murken

Pistolek

et al. 1999

Mat.-wiss. u. Werkstofftech.

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The present paper presents a novel approach which allows a direct assessment of the creep strength of thin walled DS turbine blades at temperatures up to 1100 °C using a grain morphology sensitive miniature creep specimen test technique. The work builds up on earlier investigations by DeMestral and co‐workers ([i] B. DeMestral et al., Met. and Mat. Transactions A, 27A (1996) pp. 879–890 and [ii] B. DeMestral and G. Eggeler, Prakt. Metallogr., 29 (1992) pp. 174–191) on the influence of grain morphology on creep deformation and damage accumulation in superalloys with elongated macrograins. The paper reports the important features of this new procedure which include (i) the creep test technique (specimen geometry and grip design) and (ii) the removal of creep specimens from a DS CM 247 LC cast blade with respect to the morphology of the macrograins. The paper also reports creep results obtained with this new technique at temperature of 1030 °C and a tensile stress of 180 MPa and discusses the results on the basis of the associated microstructural creep deformation and damage mechanisms.

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Section: Introductionmentioning

confidence: 99%