Very high temperature creep behavior of a single crystal Ni-based superalloy under complex thermal cycling conditions

Cormier, Jonathan; Jouiad, Mustapha; Hamon, Florence; Villechaise, Patrick; Milhet, X.

doi:10.1080/09500839.2010.489887

Cited by 71 publications

(26 citation statements)

References 16 publications

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“…This is also true for MC2 alloy [16]. In fact, the observations of the ' microstructure at failure of the C-type structure clearly demonstrate that a N-type rafting occurred (Figures 10e and 10h).…”

Section: Effect Of the Prior Microstructure Degradationsupporting

confidence: 54%

“…Re is known, among other things, to slow down the diffusion processes [28,29] coarsening [30]. In fact, the rafting process ends after 24h at 1050°C/120 MPa for MC2 (Re-free) and after 100h for CMSX-4® under similar conditions [16,31]. Since a cuboidal /' microstructure is more resistant to non-isothermal creep than a Ntype rafted one (this point will be analyzed later in the discussion), it is believed that part of the CMSX-4® advantage over MC2 is due to this slower N-type ' directional coarsening.…”

Section: Impact Of the Material's Chemistry On The Non-isothermal Crementioning

confidence: 99%

“…The typical creep behaviors of the first generation MC2 alloy [16] and CMSX-4®are compared in Figure 11, under type I thermal cycling. A C-type structure at the beginning of thermal cycling is investigated here.…”

Section: Comparison Of the Non-isothermal Creep Behavior With Mc2 Alloymentioning

confidence: 99%

“…In particular, the new certification procedures of helicopter gas turbines now include complex temperature/angular velocity histories, and sometimes thermal cycling, as for, e.g., endurance or accelerated mission (ASMET) engine tests. However, the literature analyzing the effect a such complex very high temperature creep loadings on the durability of Ni-based single crystal superalloys is scarce and mainly limited to two research teams [9][10][11][12][13][14][15][16], the pioneering works being performed on polycrystalline alloys by Rowe and Freeman [17][18]. In this context, two specific test benches were developed at the Pprime Institute (THALIE and MAATRE burners) as well as specific procedures using radiative furnaces in order to mimic realistic conditions in a controlled laboratory environment [8,16]).…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy

Giraud¹,

Cormier²,

Hervier³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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The effect of thermal cycling on the creep behavior and life of the second generation Ni-based single crystal superalloy CMSX-4® has been investigated in the very high temperature/low stress domain. Repeated overheatings at 1100°C and/or at 1150°C were introduced in the course of the creep life of the alloy at 1050°C/120 MPa. The detrimental effect of the thermal cycling compared to the isothermal creep behavior of the alloy is shown: thermal cycling leads to an increased average creep strain rate and a reduced creep life. This is always the case even when compared to the isothermal creep behavior at the highest temperature of the cycle (i.e. 1150°C/120 MPa). Moreover, the detrimental effect of the thermal cycling frequency is observed: the greater frequency the larger the creep properties decay. Compared to the first generation MC2 alloy under the same thermal cycling conditions, CMSX-4® exhibits superior non-isothermal creep properties in the very high temperature domain (T > 1100°C) due to its rhenium and ' contents.The effect of the microstructure degradation (i.e. ' rafting) was also investigated by pre-straining samples at 1050°C under tension (respectively under compression) prior to creep under thermal cycling conditions. These pre-strains allowed to generate a N-type rafting (respectively P-type). N-type ' rafting are shown to be detrimental to the non-isothermal creep properties. In contrast, P-type rafting leads to improved creep properties (i.e. reduced creep strain rate) compared to either N-type rafted or cuboidal ' morphologies. Despite a different behavior, the creep lives are identical for both P-type rafting and the cubical ' precipitates. From the present investigation, it is believed that: 1) P-type rafting improves non-isothermal creep properties due to a reduced dislocation climb activity 2) The transition from stationary creep to tertiary creep is controlled by the kinetics of Ntype rafting.

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Section: Effect Of the Prior Microstructure Degradationsupporting

confidence: 54%

Section: Impact Of the Material's Chemistry On The Non-isothermal Crementioning

confidence: 99%

Section: Comparison Of the Non-isothermal Creep Behavior With Mc2 Alloymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy

Giraud¹,

Cormier²,

Hervier³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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“…5, which is attributed to the super-saturation precipitation of the  former elements during cooling, and had been verified by the non-isothermal creep tests of the single crystal nickel-based superalloys in the ranges of 1050-1200 o C [40][41][42]. But it is understood from the amplification morphology in Fig.…”

Section: Fig5mentioning

confidence: 98%

Creep properties and deformation mechanism of the containing 4.5Re/3.0Ru single crystal nickel-based superalloy at high temperatures

Zhang

Shu

et al. 2015

Materials Science and Engineering: A

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Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non‐Isothermal Creep Behavior of CMSX‐4® Ni‐Based Single Crystal Superalloy

Giraud

Cormier

Hervier³

et al. 2012

Superalloys 2012

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show abstract

Very high temperature creep behavior of a single crystal Ni-based superalloy under complex thermal cycling conditions

Cited by 71 publications

References 16 publications

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy

Creep properties and deformation mechanism of the containing 4.5Re/3.0Ru single crystal nickel-based superalloy at high temperatures

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non‐Isothermal Creep Behavior of CMSX‐4® Ni‐Based Single Crystal Superalloy

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Very high temperature creep behavior of a single crystal Ni-based superalloy under complex thermal cycling conditions

Cited by 71 publications

References 16 publications

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4&reg; Ni-based Single Crystal Superalloy

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4&reg; Ni-based Single Crystal Superalloy

Creep properties and deformation mechanism of the containing 4.5Re/3.0Ru single crystal nickel-based superalloy at high temperatures

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non‐Isothermal Creep Behavior of CMSX‐4® Ni‐Based Single Crystal Superalloy

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Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy

Effect of the Prior Microstructure Degradation on the High Temperature/Low Stress Non-isothermal Creep Behavior of CMSX-4® Ni-based Single Crystal Superalloy