On the influence of grain morphology on creep rupture times of cavitating materials

Cans, Michel; deMestral, Bernard; Eggeler, Gunther

doi:10.1016/0956-716x(94)90367-0

Cited by 3 publications

(2 citation statements)

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“…There is a considerable scatter in rupture times of specimens 14 and 15 which stem from one blade region with no obvious microstructural heterogeneity. A microstructural explanation for scatter in creep rupture times for materials with elongated grain microstructures was presented by DeMestral and coworkers [18,20]. Orientations of individual macrograins in two specimens can be different and this results in differences in the resolved shear stresses of the corresponding microscopic slip systems [18].…”

Section: Discussionmentioning

confidence: 99%

“…Orientations of individual macrograins in two specimens can be different and this results in differences in the resolved shear stresses of the corresponding microscopic slip systems [18]. The probabilistic nature of creep damage accumulation can result in scatter in creep rupture times when creep life can be subdivided into a period of homogeneous damage accumulation during which a critical region forms which initiates final rupture [20]. It seems rea-a) sonable to assume that these effects increase as specimen size decreases and this would rationalize the considerably higher scatter observed for specimens 14 and 15. It should be emphasized that the miniature specimens taken from large grains can be single crystals, such as specimens 3, 4, 6 and 7.…”

Section: Discussionmentioning

confidence: 99%

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"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: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%