Orientation dependence of creep properties and deformation mechanism in DD6 single crystal superalloy at 760°C and 785MPa

Yu, Jian; Li, J.R.; Zhao, Jianguo; Han, Min−Koo; Shi, Zhen-xue; Liu, S.Z.; Yuan, Hua

doi:10.1016/j.msea.2012.08.135

Cited by 43 publications

(7 citation statements)

References 20 publications

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“…This natural axial texture coincides with the direction of the minimum Young's modulus, and leads to reduced thermal stresses and enhanced thermal fatigue resistance of the single-crystal components in service [29]. The deviation of the preferred growth direction from the heat flow direction (axial direction of the component) greatly influences the mechanical properties [30][31][32]. The angle between these two directions is defined as the deviation angle (θ).…”

Section: Crystallographic Orientationmentioning

confidence: 99%

Comparative study of the segregation behavior and crystallographic orientation in a nickel-based single-crystal superalloy

Wang

Bogner

et al. 2015

Journal of Alloys and Compounds

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Section: Crystallographic Orientationmentioning

confidence: 99%

Comparative study of the segregation behavior and crystallographic orientation in a nickel-based single-crystal superalloy

Wang

Bogner

et al. 2015

Journal of Alloys and Compounds

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“…Te diference between MAR-M200 and MAR-M247 alloys is that the Mar-M247 alloy has the longest creep life near the <111> orientation, whereas the Mar-M200 alloy has the longest creep life when the orientation is close to <001>. Furthermore, for these alloys [7], creep lives of alloys did not show a signifcant decrease when the crystal orientation deviated from the <001> orientation by less than 20 °. Among the samples with orientations of [001], [011], and [111], the creep life of the [111] orientation was the longest and that of the [011] orientation was the shortest.…”

Section: Introductionmentioning

confidence: 94%

“…Te creep properties and microstructure of a nickel-based singlecrystal superalloy DD413 with a 15 °deviation from the <001> orientation were investigated at 760 °C/793 MPa. Te results [7] showed that the alloy with an orientation close to the <001>-<101> boundary had the longest creep life, and the creep life of the alloy orienting near the <001>-<111> boundary was the shortest [15]. Te deformation of samples orienting near the <001>-<101> boundary was mainly controlled by the {111}<110> slip system, while the deformation of samples orienting near the <001>-<111> boundary was mainly controlled by the {111}<112> slip system [16].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Creep Behavior of a Nickel-Based Single-Crystal Superalloy with Small-Angle Deviation from [111] Orientation

Wang

Zhang

Zhao

et al. 2022

Advances in Materials Science and Engineering

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By means of tensile creep tests and microstructure analysis, the creep behavior and deformation mechanism of a nickel-based single-crystal alloy with small-angle deviations from the [111] orientation at 1040°C/137 MPa were investigated. The results suggested that in the early stage of creep, proliferating dislocations generated by different slip systems get accumulated in the γ phase. Dislocations mainly slipped in the γ phase and climbed over the γ′ phase, and they began to form a dislocation network at the interface. γ′ phases were connected to each other, and the coherence relationship was destroyed. In the steady-state stage of creep, the solid interfacial dislocation network was formed, and the γ′ phase transformed into a lamellar raft structure, which hinders the slip and climb of dislocations in the matrix channel. In the accelerated creep stage, the dislocation network was destroyed, and dislocations sheared into the γ′ phase in the way of dislocation pairs, which could react to form a superdislocation node and decompose to form APBs on the <111> plane or cross slip from the <111> plane to the <100> plane to form K-W locks.

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“…Meanwhile, complicated blade shape and the root of blades may induce multiaxial stress condition and lead to complex plastic deformation for operating the single-crystal turbine blades under service [2,5]. The crystal orientation has a great influence on the physical and mechanical properties of the material, such as yielding [6], creep [7] and fatigue [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

Liu

Meng

Liu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The influence of crystal orientations on the low-cycle fatigue (LCF) behavior of a 3Re-bearing Ni-based single-crystal superalloy at 980°C has been investigated. It is found that the orientation dependence of the fatigue life not only depends on the elastic modulus, but also the number of active slip planes and the plasticity of materials determine the LCF life, especially for the [011] and [111] specimens. The [011] and [111] specimens with better plasticity withstand relatively concentrated inelastic deformation caused by fewer active slip planes, compared to the [001] specimens resisting widespread deformation caused by a higher number of active slip planes. Additionally, fatigue fracture is also influenced by cyclic plastic deformation mechanisms of the alloy with crystal orientations, and the [001] specimens are plastically deformed by wave slip mechanism and fracture along the non-crystallographic plane, while the [011] and [111] specimens are plastically deformed by planar slip mechanism and fracture along the crystallographic planes. Moreover, casting pores, eutectics, inclusions and surface oxide layers not only initiate the crack, but also reduce the stress concentration around crack tips. Our results throw light upon the effect of inelastic strain on the LCF life and analyze the cyclic plastic deformation for the alloy with different orientations.

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Orientation dependence of creep properties and deformation mechanism in DD6 single crystal superalloy at 760°C and 785MPa

Cited by 43 publications

References 20 publications

Comparative study of the segregation behavior and crystallographic orientation in a nickel-based single-crystal superalloy

Comparative study of the segregation behavior and crystallographic orientation in a nickel-based single-crystal superalloy

High-Temperature Creep Behavior of a Nickel-Based Single-Crystal Superalloy with Small-Angle Deviation from [111] Orientation

Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

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