First creep results on thin-walled single-crystal superalloys

Hüttner, Rainer; Gabel, Johannes; Glatzel, Uwe; Völkl, Rainer

doi:10.1016/j.msea.2008.10.057

Cited by 50 publications

(33 citation statements)

References 3 publications

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“…Nevertheless after the tests at the three conditions the damaging effect of the thermal cycling has been clearly evidenced and it appears that the modifications of the creep behavior and damage processes could be principally related to the γ' re-precipitation and dissolution sequences during thermal changes. However the role of thermal cycling on the interdiffusion zone between NiCoCrAlYTa coating and CMSX-4 superalloy should be probably considered, more particularly because of the thin walled geometry of sample studied here even though according to Hüttner et al [18] noticeable short creep lifetimes of thin coated specimens can be explained only partly by the reduction of the load-bearing cross-section. Indeed although the thermal cycles do not change the present phases and the interdiffusion zone morphology, it seems that thermal cycling has to result to grow more rapidly the subcoating layer where γ' phase is predominant and TCP particles form.…”

Section: Discussionmentioning

confidence: 85%

“…In order to optimize both the cooling efficiency and the weight of fast rotating turbine blades a general trend is to reduce the wall thickness of the hollow investment casting parts. It has been shown that reducing the wall thickness leaded to lower lifetimes and higher minimum creep rates [16][17][18]. Besides in the case of thin-coated specimens it could be explained at least partly by the reduction of the load bearing because of the interdiffusion between coating and superalloy [18].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that reducing the wall thickness leaded to lower lifetimes and higher minimum creep rates [16][17][18]. Besides in the case of thin-coated specimens it could be explained at least partly by the reduction of the load bearing because of the interdiffusion between coating and superalloy [18]. The purpose of this paper is to study the influence of thermal cycling on high temperature creep of thin-walled and coated CMSX-4 single crystal superalloy.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Goti¹,

Viguier²,

Crabos³

2012

Superalloys 2012 (Twelfth International Symposium)

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Effect of thermal cycling on high temperature creep of thin-walled and coated CMSX-4 single crystal superalloy was evaluated by performing thermal cycling and isothermal creep tests at 1050°C and 140 MPa, 1150°C and 140 MPa and 1150°C and 80 MPa. The deleterious effect of thermal cycling on the creep behavior and lifetime has been confirmed, particularly for the condition at 1150°C and 80 MPa. Furthermore, the number of low temperature incursions has severe detrimental effect on creep resistance on account of the rafted microstructure destabilization induced by these sequences. These results confirm the role of re-precipitation and dissolution of γ' particles during thermal cycling creep. Thermal cycling infers also on destabilization of subcoating zone in the superalloy but this effect seems to be secondary.

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Section: Discussionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Goti¹,

Viguier²,

Crabos³

2012

Superalloys 2012 (Twelfth International Symposium)

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“…Internal cooling or thinner airfoil sections reduces weight and cost of turbine blades and leads to development of thin walled blade structure [1]. However, if casting has thin walls it is formed by several dendrites so their mutual misorientation can lead to decrease in mechanical strength and should be well defined [2].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Casting Defects in the Single Crystal Turbine Blade Airfoil

et al. 2016

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In the paper turbine blades made from single crystal CMSX-4 superalloy were investigated by X-ray diffraction methods (topography, Ω -scan mapping) complemented by scanning electron microscopy observations. By the X-ray diffraction topography method several misorientation defects were visualized as well as dendrites arrangement. It was discussed that tip of the airfoil and thin walled area of the turbine blades located near the trailing edge can accumulate more growth defects than other airfoil part, due to the complex shape of the mould.

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“…The desire for weight reduction and the use of advanced metal cooling schemes to improve jet engine efficiency tends to drive designs toward thinner airfoil walls [2]. Creep tests on both polycrystalline and single crystal Ni-based superalloy specimens have shown greater creep strain rates and/or reduced strain to creep rupture for thinner specimens than predicted by current theories [3][4][5][6][7][8][9][10][11][12][13][14]. This is known as the thickness debit effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of Specimen Thickness on the Creep Response of a Ni-Based Single Crystal Superalloy (PREPRINT)

Srivastava¹,

Gopagoni²,

Needleman³

et al. 2012

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-RX-WP-TP-2012-0394 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Research Laboratory SPONSORING/MONITORING AGENCY ACRONYM(S)Materials SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RX-WP-TP-2012-0394 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. Preprint to be submitted to Acta Materialia. SUPPLEMENTARY NOTESThis work was funded in whole or in part by Department of the Air Force contract FA8650-08-C-5226. The U.S. Government has for itself and others acting on its behalf an unlimited, paid-up, nonexclusive, irrevocable worldwide license to use, modify, reproduce, release, perform, display, or disclose the work by or on behalf of the U.S. Government. PA Case Number and clearance date: 88ABW-2012-2171, 11 April 2012. This document contains color. ABSTRACTCreep tests on Ni-based single crystal superalloy sheet specimens typically show greater creep strain rates and/or reduced strain or time to creep rupture for thinner specimens than predicted by current theories which predict a size independent creep strain rate and creep rupture strain. This size dependent creep response is termed the thickness debit effect. To investigate the mechanism of the thickness debit effect, isothermal, constant nominal stress creep tests were performed on uncoated PWA1484 Ni-based single crystal superalloy sheet specimens of thicknesses 3.18mm and 0.51mm under two test conditions: 760•C/758MPa and 982•C/248MPa. The specimens contained initial micro-voids formed during the solidification and homogenization processes. The dependence of the creep response on specimen thickness differed under the two test conditions: at 760•C/758MPa there was a reduction in the creep strain and the time to rupture with decreasing section thickness while at 982•C/248MPa a decreased thickness resulted in an increased creep rate even at low strain levels and a decreased time to rupture but with no systematic dependence of the creep... SUBJECT TERMS AbstractCreep tests on Ni-based single crystal superalloy sheet specimens typically show greater creep strain rates and/or reduced strain or time to creep rupture for thinner specimens than predicted by current theories which predict a size independent creep strain rate and creep rupture strain. This size dependent creep response is termed the thickness debit effect. To investigate the mechanism of the thickness debit effect, isothermal, constant nominal stress creep tests were performed on uncoate...

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First creep results on thin-walled single-crystal superalloys

Cited by 50 publications

References 3 publications

Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Effect of Thermal Cycling on High Temperature Creep of Coated CMSX-4

Characterization of Casting Defects in the Single Crystal Turbine Blade Airfoil

Effect of Specimen Thickness on the Creep Response of a Ni-Based Single Crystal Superalloy (PREPRINT)

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