Deformation and fracture of the PWA 1472 superalloy single crystal

Ebrahimi, Fereshteh; Yanevich, J.; DeLuca, Daniel P.

doi:10.1016/s1359-6454(99)00355-9

Cited by 22 publications

(6 citation statements)

References 17 publications

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“…These characteristics are in marked contrast to those of the commercial Ni-base superalloys (e.g. Rene N-4 [32], CMSX-2 [33], AM3 [33], SRR99 [34] and PWA1472 [35]) with very high CRSS (>350 MPa) and small or even negative work hardening rate, which may result in non-uniform deformation and consequently difficulty in fabricating a thin foil with good quality simply by heavy cold rolling. The good intrinsic ductility of the binary two-phase alloys is thus one of the great advantages for the practical cold rolling.…”

Section: Tensile Properties Of the G/g 0 Single Crystalsmentioning

confidence: 76%

Tensile properties and cold rolling of binary Ni–Al γ/γ′ two-phase single crystals

Kishida

Demura

et al. 2008

Intermetallics

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Section: Tensile Properties Of the G/g 0 Single Crystalsmentioning

confidence: 76%

Tensile properties and cold rolling of binary Ni–Al γ/γ′ two-phase single crystals

Kishida

Demura

et al. 2008

Intermetallics

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“…The lower number of activated slip systems can decrease the likelihood of cross slip and crack initiation at stress concentration regions around the hole. 27,28 The lowest value of t RSS =t CRSS for dominant slip systems was found when secondary orientation was set to 458. At 08 À 108 secondary orientation, the dominant slip systems appeared to have lowest t RSS =t CRSS .…”

Section: Effect Of Scomentioning

confidence: 97%

“…The crack was found to be initiated from the interaction zone. 27,28 Figure 9 shows the plastic slip of various dominant slip systems around the circular hole of similar dimension in FE simulations. The notch root region was divided into several sectors according to the direction of systems.…”

Section: Stress Concentrationmentioning

confidence: 99%

Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

Zhai

Khan

Correia

et al. 2019

The Journal of Strain Analysis for Engineering Design

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The effects of the secondary crystal orientations on the nickel-based single-crystal superalloy turbine blades were investigated. The stress concentration features were used for investigation of the optimal secondary crystal orientation leading to the higher strength of the single-crystal turbine blades. The crystal plastic finite element method coupled with micromechanics constitutive model is applied to study the effect of secondary crystal orientation on plastic deformation and mechanical behavior around the cooling holes and notches with the primary (load) orientation fixed at [001] direction. For nickel-based superalloy plates with holes or notches, the secondary crystal orientation effect on the strength needs to be clarified at various load levels. The maximum von Mises stress in the single-crystal alloy varies significantly with variation in the secondary crystal orientations. It was found that only two slip systems dominate the deformation process of the material owing to their favorable orientation with loading. The secondary orientation of 45°was identified with lowest resolved shear stress in the dominating slip systems and potential of producing higher strength for single-crystal turbine blades.

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“…7a) and occasionally several secondary slip bands can be found in the slip cracks which are in fact the cracked primary slip bands due to the excessive gliding (Fig. 7b), suggesting that the primary slip bands first operate at the early stage of deformation and then the secondary slip bands initiate with increased deformation [30,31]. When the primary slip bands are not interfered by the secondary slip bands, they freely move, leading to the strain softening of the alloy.…”

Section: Effect Of Strain Rate On the Tensile Propertiesmentioning

confidence: 98%

Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways

Liang

Zhong

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The tensile properties and deformation behavior of several cast Ni-based superalloys, respectively, in the equiaxed, columnar-crystal and single-crystal styles are comparatively studied. The effects of solidification way, heat treatment and strain rate on the tensile properties are discussed in detail. It is found that the reduction of grain boundaries by the feasible solidification ways offers cast Ni-based superalloys the potential capability of improving the mechanical properties, the ultimate achievement of which is also confirmed to lie on the appropriate modifications of chemical composition and heat treatment. The prolongation of solid solution facilitates the precipitation of fine secondary c 0 phase, whereas the extension of high-temperature aging leads to the coarsening of secondary c 0 phase. The combination of these two aspects has a crucial influence on the tensile properties. Under tensile applied stress, the surface grains of DZ-A alloy deform slightly, while the inner grains deform heavily. This deformation inhomogeneity is ascribed to the occurrence of cracks or oblique grains near the surface of specimens and the sliding or decohesion of grain boundaries between the surface and inner grains. Regardless of strain rate, the ILTDM (intermediate-low-temperature ductility minimum) phenomenon always happens in the temperature range from 400 to 600°C in all the investigated alloys, the occurrence of which is closely related to the strong strain-hardening behavior in the deformation process. Finally, the interaction of slip bands which are the main deformation mode below 600°C is established to be the essential reason for the strain hardening.

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Deformation and fracture of the PWA 1472 superalloy single crystal

Cited by 22 publications

References 17 publications

Tensile properties and cold rolling of binary Ni–Al γ/γ′ two-phase single crystals

Tensile properties and cold rolling of binary Ni–Al γ/γ′ two-phase single crystals

Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

Tensile Properties and Deformation Behavior of Several Cast Ni-Based Superalloys Fabricated by Different Solidification Ways

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