High temperature tensile deformation of a directionally solidified nickel base superalloy: Role of micro constituents

K, R; Sahu, J.K.; Jena, P.; Das, Swapan K; Paulose, Neeta; Fernando, C.

doi:10.1016/j.msea.2017.08.044

Cited by 28 publications

(15 citation statements)

References 7 publications

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“…However, at low temperatures, there was a competitive relationship between cracking and interface debonding of the carbide inclusion under the same level of the external load. Researchers found that the tendency of carbide cracking decreased and more carbide-matrix interface debonding were observed with increase temperature for CM 247 DS alloy [10]. This was consistent with our experimental results.…”

Section: Failure Modes Caused By Inclusionssupporting

confidence: 92%

“…In general, the failure of Ni-based superalloy material originates from the sites of stress concentration. The main cause of stress concentration is the presence of defects in the material, including, MC, holes, precipitates phase and so on [9,10]. Figure 4a,b showed the two different morphology, rod and block shape, of carbide inclusions after tensile failure for PWA1483 Ni-based superalloy at 900 °C.…”

Section: Failure Modes Caused By Inclusionsmentioning

confidence: 99%

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In-Situ SEM Deformation Testing of Ni-Based Superalloy Heated by the Joule Heat

Wang

Liang

2018

The 18th International Conference on Experimental Mechanics

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Studying the deformation and microstructure evolution for Ni-based single crystal alloys at high temperature has important effects on the design of turbine blades and disks. However, in-situ high temperature tests under scanning environment pose an important challenge for the current experimental conditions. In this paper, the resistance heating system was introduced into the high temperature fatigue experimental apparatus. The in-situ tensile test of 900 °C was successfully carried out. The experimental results showed that the crack initiation was mainly caused by inclusion debonding. The fracture mode was mainly characterized by the connection of micro holes.

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Section: Failure Modes Caused By Inclusionssupporting

confidence: 92%

Section: Failure Modes Caused By Inclusionsmentioning

confidence: 99%

In-Situ SEM Deformation Testing of Ni-Based Superalloy Heated by the Joule Heat

Wang

Liang

2018

The 18th International Conference on Experimental Mechanics

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“…With the increase of global stress, stress concentration is more obvious on the interface and further leads to deformation even concerning cracks on the interface. That interfacial crack behavior is similar to carbides/matrix interfacial debonding [16].…”

Section: Discussionmentioning

confidence: 60%

Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

et al. 2020

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An in situ scanning electron microscope (SEM) tensile test for Ni-based single-crystal superalloy was carried out at 1000 °C. The stress displacement was obtained, and the yield strength and tensile strength of the superalloy were 699 MPa and 826 MPa, respectively. The crack propagation process, consisting of Model I crack and crystallographic shearing crack, was determined. More interestingly, the crack propagation path and rate affected by eutectics was directly observed and counted. Results show that the coalescence of the primary crack and second microcrack at the interface of a γ/γ′ matrix and eutectics would make the crack propagation rate increase from 0.3 μm/s to 0.4 μm/s. On the other hand, crack deflection decreased the rate to 0.05 μm/s. Moreover, movement of dislocations in front of the crack was also analyzed to explain the different crack propagation behavior in the superalloy.

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“…The polycrystalline nickel-based superalloy, EA, with a nominal composition of 9.3Co, 8.0Cr, 0.49Mo, 5.58Al, 0.74Ti, 9.49W, 3.21Ta, 0.018B, 0.009Zr, 1.41Hf, 0.07C, and balance Ni (wt.%) 19,20 in the form of the cylindrical bar was used in the present study. The rods were subjected to two-stage aging treatments.…”

Section: Methodsmentioning

confidence: 99%

Effect of carbide precipitation on Coffin–Manson relationship of a polycrystalline nickel‐based superalloy

Kumar

Jena

Paulose

et al. 2022

Fatigue Fract Eng Mat Struct

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This study explores the dual‐slope Coffin–Manson (C–M) behavior of a polycrystalline nickel‐based superalloy, EA, used in turbine engine applications with an emphasis on discerning the micro‐mechanisms responsible for it. The motivation for distinguishing the micro‐mechanisms responsible for bi‐linear C–M behavior stemmed from the earlier evolved comprehensions that state that the fatigue life estimation based on the extrapolation of any single line gives inaccurate results. Transmission electron microscopy (TEM) investigations of fatigue fractured specimens at low strain amplitudes, Δε/2, revealed that dislocations are homogeneously distributed in the γ‐channels and occasionally form networks at γ/γ′ interface. Whereas deformation is heterogeneous at high Δε/2 owing to the complex dislocation reactions. Cr23C6 carbides are precipitated during the high Δε/2 fatigue tests, which act as obstacles for dislocations. The deformation heterogeneity resulting from the dislocation–γ′ precipitate interactions and the dislocation–M23C6 carbide interactions accounts for the dual‐slope C–M behavior.

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High temperature tensile deformation of a directionally solidified nickel base superalloy: Role of micro constituents

Cited by 28 publications

References 7 publications

In-Situ SEM Deformation Testing of Ni-Based Superalloy Heated by the Joule Heat

In-Situ SEM Deformation Testing of Ni-Based Superalloy Heated by the Joule Heat

Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

Effect of carbide precipitation on Coffin–Manson relationship of a polycrystalline nickel‐based superalloy

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