The role of coincidence-site-lattice boundaries in creep of Ni-16Cr-9Fe at 360 °C

Thaveeprungsriporn, Visit; Was, Gary S.

doi:10.1007/s11661-997-0167-6

Cited by 118 publications

(52 citation statements)

References 41 publications

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“…Lehockey and Palumbo 7 have shown that a high fraction of special boundaries significantly enhances the resistance to creep of pure nickel at elevated temperatures. Other studies [10][11][12][13][14][15][16][17][18][19] have demonstrated significant improvements in a number of properties, including stress-corrosion cracking, fatigue, weldability, and creep, with an increase in the special boundary fraction. In terms of stress-corrosion cracking, Ni, Ni-16Cr-9Fe-xC, and Alloy 600 have shown significant improvements with increased fractions of special boundaries, 11,13,16,19 and these findings have been attributed to both the intrinsic corrosion resistance, and the resistance to solute segregation and precipitation exhibited by special boundaries.…”

Section: Methodsmentioning

confidence: 99%

“…In terms of creep resistance, it has also been shown that the presence of a high fraction of special boundaries decreases the creep rate of Ni, Ni-16Cr-Fe, Alloy 625, and Alloy 738. 7,10,15,17,18 In fact, pure Ni microstructures containing special grainboundary fractions in excess of 50% exhibit improvements of 15-fold and fivefold, respectively, in steadystate creep rate and primary creep strain. 7,15 The EBSD hardware and software used in this work were manufactured by EDAX-TSL, Inc. (Mahwah, NJ).…”

Section: Methodsmentioning

confidence: 99%

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The evolution of grain-boundary cracking evaluated through in situ tensile-creep testing of Udimet alloy 188

et al. 2008

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In situ scanning electron microscopy was performed during elevated-temperature (ഛ760°C) tensile-creep deformation of a face-centered-cubic cobalt-based Udimet 188 alloy to characterize the deformation evolution and, in particular, the grain boundary-cracking evolution. In situ electron backscatter diffraction observations combined with in situ secondary electron imaging indicated that general high-angle grain boundaries were more susceptible to cracking than low-angle grain boundaries and coincident site-lattice boundaries. The extent of general high-angle grain-boundary cracking increased with increasing creep time. Grain-boundary cracking was also observed throughout subsurface locations as observed for postdeformed samples. The electron backscattered diffraction orientation mapping performed during in situ tensile-creep deformation proved to be a powerful means for characterizing the surface deformation evolution and in particular for quantifying the types of grain boundaries that preferentially cracked.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The evolution of grain-boundary cracking evaluated through in situ tensile-creep testing of Udimet alloy 188

et al. 2008

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“…[9][10][11] Alloy 690 is an fcc material with low SFE; therefore, GBE may increase the resistance of the alloy to intergranular failure. One of the central topics of GBE is how the TMP affects the microstructural evolution that leads to high proportions of low-R CSL grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690

Xia

Zhou

Chen

2009

Metall Mater Trans A

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The effects of thermal-mechanical processing (TMP) on microstructure evolution during recrystallization and grain boundary character distribution (GBCD) in aged Alloy 690 were investigated by the electron backscatter diffraction (EBSD) technique and optical microscopy. The original grain boundaries of the deformed microstructure did not play an important role in the manipulation of the proportion of the R3 n (n = 1, 2, 3…) type boundaries. Instead, the grain cluster formed by multiple twinning starting from a single nucleus during recrystallization was the key microstructural feature affecting the GBCD. All of the grains in this kind of cluster had R3 n mutual misorientations regardless of whether they were adjacent. A large grain cluster containing 91 grains was found in the sample after a small-strain (5 pct) and a high-temperature (1100°C) recrystallization anneal, and twin relationships up to the ninth generation (R3 9 ) were found in this cluster. The ratio of cluster size over grain size (including all types of boundaries as defining individual grains) dictated the proportion of R3 n boundaries.

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“…Grain size and second phase topology are well-known key factors to get the required properties in γ-γ' nickel-based superalloys such as Udimet 720 [1][2][3][4][5][6]. The grain boundary network optimization is another possible route [7][8][9][10][11][12].…”

Section: Introduction / Backgroundmentioning

confidence: 99%

Evolution of microstructure and twin density during thermomechanical processing in a γ-γ’ nickel-based superalloy

Bozzolo¹,

Souaï²,

Logé³

2012

Acta Materialia

107

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. Evolution of microstructure and twin density during thermomechanical processing in a γ-γ' nickel-based superalloy. Acta Materialia, Elsevier, 2012, 60 (13) Abstract.Microstructure evolution has been studied in the nickel-based superalloy PER®72 submitted to hot-torsion, to annealing below the primary γ' solvus temperature and to annealing at a supersolvus temperature, with a special emphasis on grain size and twin content. Dynamic abnormal grain growth occurs before the onset of dynamic recrystallization. The resulting bimodal grain size distribution affects the grain coarsening kinetics at the supersolvus temperature, so that the final microstructures depend on the former straining stages. As a consequence, the twin content does not follow a univocal relationship with the average grain size. The grain boundary velocity history before reaching the final grain size is a contributing factor, and this is notably related to the initial grain size distribution width. Dynamically recrystallized microstructures are by nature more homogeneous and give then rise to lower rates in supersolvus grain coarsening, and accordingly lead to relatively lower twin densities.

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The role of coincidence-site-lattice boundaries in creep of Ni-16Cr-9Fe at 360 °C

Cited by 118 publications

References 41 publications

The evolution of grain-boundary cracking evaluated through in situ tensile-creep testing of Udimet alloy 188

The evolution of grain-boundary cracking evaluated through in situ tensile-creep testing of Udimet alloy 188

Grain Cluster Microstructure and Grain Boundary Character Distribution in Alloy 690

Evolution of microstructure and twin density during thermomechanical processing in a γ-γ’ nickel-based superalloy

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