Development and Introduction of a Damage Tolerant High Temperature Nickel-Base Disk Alloy, Rene'88DT

Krueger, D. D.; Kissinger, R.D.; Menzies, R. G.

doi:10.7449/1992/superalloys_1992_277_286

Cited by 35 publications

(25 citation statements)

References 2 publications

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“…The nominal composition of this alloy is 13 %Co, 16 %Cr, 4 %Mo, 4 %W, 2.1 %Al, 3.7 %Ti, 0.7 %Nb, 0.03 %C, 0.015 %B (wt %) [23]. The microstructure of the alloy consists of a γ matrix and two populations of gamma prime (γ ) precipitates: larger secondary and nmscale tertiary γ within the γ grains [23]. The size of the secondary γ phase is about 100-200 nm, while tertiary γ precipitates are several nanometers in diameter.…”

Section: Materials and Experimental Procedures Materialsmentioning

confidence: 99%

Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

et al. 2015

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Damage during loading of polycrystalline metallic alloys is localized at or below the scale of individual grains. Quantitative assessment of the heterogeneous strain fields at the grain scale is necessary to understand the relationship between microstructure and elastic and plastic deformation. In the present study, digital image correlation (DIC) is used to measure the strains at the sub-grain level in a polycrystalline nickel-base superalloy where plasticity is localized into physical slip bands. Parameters to minimize noise given a set speckle pattern (introduced by chemical etching) when performing DIC in a scanning electron microscope (SEM) were adapted for measurements in both plastic and elastic regimes. A methodology for the optimization of the SEM and DIC parameters necessary for the minimization of the variability in strain measurements at high spatial resolutions is presented. The implications for detecting the early stages of damage development are discussed.

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Section: Materials and Experimental Procedures Materialsmentioning

confidence: 99%

Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

et al. 2015

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“…Experiments were conducted on an as-extruded alloy designated (René88DT) with nominal composition listed in Table 1 [6]. Table I.…”

Section: Materials and Experiments Proceduresmentioning

confidence: 99%

“…Table I. René88DT alloy composition in wt% [6]. Compression samples measuring 5x5x10mm were machined by wire EDM.…”

Section: Materials and Experiments Proceduresmentioning

confidence: 99%

Grain Scale Straining Processes during High Temperature Compression of a PM Disk Alloy

Tu¹,

Pollock²,

Reed³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Microstructural-scale straining processes that occur during high temperature compression of powder-consolidated nickel-based superalloy René 88DT at 1050˚C (1925˚F) have been studied. A high temperature strain mapping technique has been utilized to quantify grain-level strain accumulation. Orientation imaging has also been employed to study grain-level straining and dislocation storage. Two distinct straining mechanisms were observed. At low strain rates grain boundary sliding dominates while intragranular plastic deformation is observed during high rate compression. Stored strain and microstructural evolution are dependent on strain rate during compression. At low strain rates superplastic deformation occurs with low levels of stored strain and some grain growth. At high strain rates dynamic recrystallization occurs along with higher levels of stored strain within selected grains, particularly those at the high end of the grain size distribution. Dynamic recrystallization results in grain refinement and flow stress softening, which all occur when misorientation within individual grains exceeds a level of approximately 5°.

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“…1b). Aging or tertiary γ' phase, although not apparent in Fig 1b, is also present and reported to be approximately 100Å in size [8].…”

Section: Methodsmentioning

confidence: 66%

Microstructural Conditions Contributing to Fatigue Variability in P/M Nickel-Base Superalloys

Porter¹,

Li²,

Caton³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Variability in the fatigue behavior of two common nickel-base superalloys is discussed, with emphasis given to understanding the behavior of short fatigue cracks. René88DT and IN100 are the materials of interest and serve important roles in many turbine engine systems. Multiple specimens of each material were tested under low cycle fatigue (LCF) conditions at elevated temperature. Two IN100 specimens that exhibited significant difference in cycles to failure and three René88DT specimens having dissimilar short fatigue crack growth rates were interrogated to determine the reasons for these variations. This paper will discuss the microstructure adjacent to the initiation sites in these specimens and its role in affecting the observed disparate crack growth behavior. Additionally, an image correlation technique, used to evaluate the development of strain concentrations in a René88DT tensile specimen at room temperature, is described. The utility of image correlation for identifying microstructural 'hot spots' (i.e. initiation sites) in concert with LCF testing is considered.

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Development and Introduction of a Damage Tolerant High Temperature Nickel-Base Disk Alloy, Rene'88DT

Cited by 35 publications

References 2 publications

Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

Grain Scale Straining Processes during High Temperature Compression of a PM Disk Alloy

Microstructural Conditions Contributing to Fatigue Variability in P/M Nickel-Base Superalloys

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