Evolution of Ni-based superalloys for single crystal gas turbine blade applications

Caron, Pierre; Khan, T.

doi:10.1016/s1270-9638(99)00108-x

Cited by 444 publications

(168 citation statements)

References 1 publication

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“…Because of its unique properties, rhenium is used in industry as an additive to metal alloys which significantly improves their hardness and resistance to corrosion. Among others, these alloys find application in reaction engine blades, engine turbines and shields of special purpose vehicles [13]. There are a number of methods enabling the deposition of layers (in particular layers having a variable composition) on both metallic and non-metallic substrates available.…”

Section: Resultsmentioning

confidence: 99%

Metal-ceramic functionally graded materials – manufacturing, characterization, application

Chmielewski¹,

Pietrzak²

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Functionally graded materials (FGMs) belong to a new, continuously developing group of materials, finding application in various branches of industry. The idea of freely designing their construction profile, restricted only by the available manufacturing techniques, enables obtaining materials with composition and structure gradients having unprecedented properties. In this paper, selected results of works carried out by the authors and relating to the application of the developed metal-ceramic composites were presented in order to manufacture functionally graded materials for target purposes. Gradient structures with various construction profiles that can play different roles were produced on the basis on the following material pairs: Cr-Al2O3, NiAl-Al2O3 and Cu-AlN. Manufacturing conditions, microstructure characteristics and selected properties, crucial from the point of view of future applications, were presented.

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Section: Resultsmentioning

confidence: 99%

Metal-ceramic functionally graded materials – manufacturing, characterization, application

Chmielewski¹,

Pietrzak²

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…Chromium is integral to the modern superalloys as it imparts good environmental and mechanical properties [40,41]. Recently, it was also found that Cr influences the morphology of c 0 precipitates by effecting the partitioning of W across c/c 0 interface in Co(Ni)-Al-W-based alloys that reduces the lattice misfit [42].…”

Section: Recent Reports On New C-cmentioning

confidence: 99%

Effect of Cr addition on γ–γ′ cobalt-based Co–Mo–Al–Ta class of superalloys: a combined experimental and computational study

et al. 2017

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The present article deals with effect of Cr addition (10 at.%) on the partitioning behavior and the consequent effect on mechanical properties for tungsten-free c-c 0 cobalt-based superalloys with base alloy compositions of Co-30Ni-10Al-5Mo-2Ta (2Ta) and Co-30Ni-10Al-5Mo-2Ta-2Ti (2Ta2Ti). Cr addition leads to a change in the morphology of the strengthening cuboidal-shaped c 0 precipitates to a spherical shape. The site preference of Cr atoms in two alloy systems (with and without Ti) has been experimentally investigated using atom probe tomography with the supportive prediction from first principles DFT-based computations. Cr partitions more to the c matrix relative to c 0 . However, Cr also has a strong effect on the Ta and Mo partitioning coefficient across c/c 0 interfaces. The value of partition coefficient for Mo (K Mo ) becomes \1 with Cr addition to the alloys. Results from ab initio calculations show that the Cr atoms prefer to replace Mo atoms in the sublattice sites of the L1 2 unit cell. The solvus temperature of about 1038 and 1078°C was measured for 10Cr2Ta and 10Cr2Ta2Ti alloy, respectively, and these Cr-containing alloys have very low densities in the range of *8.4-8.5 gm/cm -3 . The 0.2% compressive proof strength of 10Cr2Ta2Ti alloy yields a value of 720 MPa at 870°C, substantially better than most Co-Al-W-based alloys and many of the nickel-based superalloys (e.g., MAR-M-247).

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“…[43] Re addition can substantially lower the c¢ coarsening kinetics and helps to bring about large negative misfits, but also increases the tendency to form Rerich TCP phases. [44,45] Ru can effectively stabilize the microstructure by suppressing the precipitation of TCP phases. [34,46] We now attempt to predict the effect of the concentration of specific alloying elements on the microstructure and rafting kinetics, taking the base composition of CMSX-4 superalloy as the starting point.…”

Section: A Effect Of Alloying Element On Microstructure and Creep Prmentioning

confidence: 99%

The Compositional Dependence of the Microstructure and Properties of CMSX-4 Superalloys

Zwaag

2017

Metall Mater Trans A

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The degradation of creep resistance in Ni-based single-crystal superalloys is essentially ascribed to their microstructural evolution. Yet there is a lack of work that manages to predict (even qualitatively) the effect of alloying element concentrations on the rate of microstructural degradation. In this research, a computational model is presented to connect the rafting kinetics of Ni superalloys to their chemical composition by combining thermodynamics calculation and a modified microstructural model. To simulate the evolution of key microstructural parameters during creep, the isotropic coarsening rate and c/c¢ misfit stress are defined as composition-related parameters, and the effect of service temperature, time, and applied stress are taken into consideration. Two commercial superalloys, for which the kinetics of the rafting process are selected as the reference alloys, and the corresponding microstructural parameters are simulated and compared with experimental observations reported in the literature. The results confirm that our physical model not requiring any fitting parameters manages to predict (semiquantitatively) the microstructural parameters for different service conditions, as well as the effects of alloying element concentrations. The model can contribute to the computational design of new Ni-based superalloys.

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Evolution of Ni-based superalloys for single crystal gas turbine blade applications

Cited by 444 publications

References 1 publication

Metal-ceramic functionally graded materials – manufacturing, characterization, application

Metal-ceramic functionally graded materials – manufacturing, characterization, application

Effect of Cr addition on γ–γ′ cobalt-based Co–Mo–Al–Ta class of superalloys: a combined experimental and computational study

The Compositional Dependence of the Microstructure and Properties of CMSX-4 Superalloys

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