Microstructure of Nickel‐Based Superalloys

Sabol, G.P.; Stickler, R.

doi:10.1002/pssb.19690350102

Cited by 168 publications

(46 citation statements)

References 22 publications

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“…Because it is age-hardened during heat treatment by precipitation of nanoscale Ni 3 M γ and γ phases (M = Al, Ti, Nb) rather than by cold work, alloy 725 also displays high strength along with excellent ductility and toughness [2][3][4]. Coherency strains from γ and γ precipitates are thought to be the main strengthening mechanism in alloys such as Inconel ® 718 [5,6] and 725 [7].…”

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confidence: 99%

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Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Wang

Hanson

Gradečak

et al. 2013

Materials Research Letters

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confidence: 99%

“…Al 3 Ti or Ni 3 V), and those that deform by glide of 110 superdislocations on {111} planes (e.g. Al 3 V).…”

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confidence: 99%

Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Wang

Hanson

Gradečak

et al. 2013

Materials Research Letters

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“…Here, O L is the apex of the DebyeScherrer cones, B is the center hole that allows the incident x-rays to pass through for alignment purposes, and C i s are the locations of the slits. with coherent γ precipitates, which serve as the primary strengthening feature [40], [37]. Even though the precipitate volume fraction can be quite high, the coherency of the γ with the γ phase allows Ni-base superalloys to be treated as a single FCC phase structurally and crystallographically [44] albeit with small superlattice peaks appearing within the spectrum.…”

Section: Materials and Samplementioning

confidence: 99%

Quantifying Three-Dimensional Residual Stress Distributions Using Spatially-Resolved Diffraction Measurements and Finite Element Based Data Reduction

et al. 2013

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Residual stress can play a significant role in the processing and performance of an engineered metallic component. The stress state within a polycrystalline part can vary significantly between its surface and its interior. To measure three-dimensional (3D) residual stress fields, a synchrotron x-ray diffraction-based experimental technique capable of non-destructively measuring a set of lattice strain pole figures (SPFs) at various surface and internal points within a component was developed. The resulting SPFs were used as input for a recently developed bi-scale optimization scheme [31] that combines crystal-scale measurements and continuum-scale constraints to determine the 3D residual stress field in the component. To demonstrate this methodology, the 3D residual stress distribution was evaluated for an interference-fit sample fabricated from a low solvus high refractory (LSHR) polycrystalline Ni-base superalloy.

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“…1,2 Ni provides high resistance to stress corrosion cracking and degradation due to corrosive attack by several inorganic and organic compounds. 1,2 Cr provides resistance to oxidizing environments in corrosive solutions or high temperatures. 1,2 Although the literature contains wealth of data on physical, thermal and mechanical properties of Ni-Fe-Cr alloys, one important aspect that has not been explored yet for superalloys in general is their response when they are formed in isolated nano-dimensional solids such as nanoparticles and nanowires with ultra-fine crystalline or amorphous microstructures.…”

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Synthesis and Electron Microscopy of Superalloy Nanowires

Berlia

Singh

Kumar

et al. 2014

ECS Electrochemistry Letters

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An electrodeposition based methodology for synthesizing Ni-Cr-Fe nanowires is provided. As-synthesized nanowires were 200 nm in diameter and more than 5 μm in length. Detailed characterization of the nanowires using electron microscopy technique revealed an amorphous microstructure for the nanowires with uniform distribution of Ni, Fe and Cr atoms. Annealing of the nanowire using the electron beam inside electron microscope resulted in gradual crystallization of amorphous microstructure into a nanocrystalline one which illustrated the potential for microstructural engineering of the nanowires. © 2014 The Electrochemical Society. [DOI: 10.1149/2.0061502eel] All rights reserved.Manuscript submitted October 13, 2014; revised manuscript received November 21, 2014. Published December 12, 2014 Family of Ni-rich, Ni-Fe-Cr alloys which fall in the group of materials known as Ni based superalloys possess remarkable resistance to degradation when exposed to extreme conditions such as high temperatures and highly corrosive environments.1,2 Ni provides high resistance to stress corrosion cracking and degradation due to corrosive attack by several inorganic and organic compounds.1,2 Cr provides resistance to oxidizing environments in corrosive solutions or high temperatures.1,2 Although the literature contains wealth of data on physical, thermal and mechanical properties of Ni-Fe-Cr alloys, one important aspect that has not been explored yet for superalloys in general is their response when they are formed in isolated nano-dimensional solids such as nanoparticles and nanowires with ultra-fine crystalline or amorphous microstructures. Although much is known about the grain size effect on mechanical properties, a synergistic effect of factors such as ultrafine crystalline or amorphous microstructure and nano-dimensional geometry still remains scarcely explored. It has been shown by researches that the mechanical behavior of systems when they are present as isolated nanosolids can be considerably different from the case when they are formed in bulk geometries. 3,4The present work provides a template assisted electrochemistry based methodology for synthesizing Ni-Fe-Cr nanowires of 200 nm diameter. This methodology has been widely used for synthesizing single component and alloyed nanowires. [5][6][7][8][9][10][11] It is also illustrated that by suitably annealing the as-synthesized nanowires a microstructural engineering can be performed which can be used to tune the mechanical properties of the nanowires. ExperimentalThree component Ni-Cr-Fe nanowires were synthesized by the conventional electrodeposition technique. Anodic alumina membrane having cylindrical pores with an average diameter of 200 nm, a nominal thickness of 60 μm and pore density of 10 9 pores/cm 2 was used as template for obtaining nanowire morphology. A platinum foil was used as anode. A copper foil attached to the alumina disc using a conductive adhesive tape (carbon tape) was used as cathode. A schematic showing the arrangement of electrodes in the electroch...

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Microstructure of Nickel‐Based Superalloys

Cited by 168 publications

References 22 publications

Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Quantifying Three-Dimensional Residual Stress Distributions Using Spatially-Resolved Diffraction Measurements and Finite Element Based Data Reduction

Synthesis and Electron Microscopy of Superalloy Nanowires

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