Comparison of fatigue crack propagation in nickel base superalloys RR1000 and Udimet 720Li

Pang, H.T.; Hardy, Mark; Hide, N.J.; Wilcock, I. M.; Henderson, Monika; Reed, P.A.S.

doi:10.1179/1743284715y.0000000060

Cited by 16 publications

(14 citation statements)

References 34 publications

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“…The values obtained for RR1000 show the same trend and are in line with the literature data, in particular with alloys Udimet 720LI and IN718 [15]. The agreement with alloy Udimet terms of composition [1,27]. However, with respect to the literature values, C12 and C44 correspond to the lower range, whereas C11 defines the upper limit.…”

Section: Figure 5 Experimentally Determined Reduced Young's Moduli Fsupporting

confidence: 89%

“…In terms of chemical composition, alloy RR1000 is relatively close Udimet 720LI. Accordingly, the stiffness properties of Udimet 720LI are the closest to those observed for RR1000 in this study (see Figure 6 and Figure 7), and the lower anisotropy ratio for RR1000 could be a result of its higher γ' volume fraction [27]. Furthermore, the effective modulus is not only dependent on the stiffness coefficients of the γ and γ' phase, but also on the γ' precipitate morphology and distribution.…”

Section: Figure 5 Experimentally Determined Reduced Young's Moduli Fsupporting

confidence: 72%

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Evaluation of single crystal elastic stiffness coefficients of a nickel-based superalloy by electron backscatter diffraction and nanoindentation

Everaerts

Papadaki

et al. 2019

Journal of the Mechanics and Physics of Solids

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A new methodology was developed in order to obtain single crystal elastic coefficients from nanoindentation experiments on a cubic polycrystal. The method consists of locating grains that are oriented with a <100>, <110> or <111> direction near-parallel to the sample surface normal by means of electron backscattering diffraction. The reduced Young's moduli of the selected grains are then determined by nanoindentation. Finally, the average reduced modulus and Euler angles of each grain are used as input for a least-squares optimisation to calculate the three independent stiffness coefficients, which can then be used to obtain Young's modulus in any crystallographic direction. This technique, which was validated on a single crystal nickel-based superalloy (CMSX-4) with known elastic coefficients, was applied to a polycrystalline nickel-based superalloy (RR1000) with unknown elastic coefficients, resulting in a correct prediction of the general trend of increasing Young's modulus from the <100> to the <110> to the <111> direction. The stiffness coefficients C11, C12 and C44 were found to be 282, 121 and 108 GPa, respectively. These results, which are representative of the γ/γ' structure as a whole, are in good agreement with literature data on similar superalloys. By constructing a visual representation of the elastic anisotropy based on the crystallographic factor, it is shown that the observed anisotropy is lower compared to other alloys.

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Section: Figure 5 Experimentally Determined Reduced Young's Moduli Fsupporting

confidence: 89%

Section: Figure 5 Experimentally Determined Reduced Young's Moduli Fsupporting

confidence: 72%

Evaluation of single crystal elastic stiffness coefficients of a nickel-based superalloy by electron backscatter diffraction and nanoindentation

Everaerts

Papadaki

et al. 2019

Journal of the Mechanics and Physics of Solids

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“…It is widely reported that the addition of a dwell period at maximum load at high temperature can significantly increase the crack growth rate per fatigue cycle in Ni-base superalloys [40][41][42][43][44][45][46][47][48][49][50][51][52]. Among these literature, Gustafsson et al [51,[53][54][55] has reported systematic results on the crack propagation behaviours with different dwell periods at different temperatures of a forged IN718.…”

Section: Accelerated Crack Propagationmentioning

confidence: 99%

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Deng

2019

Linköping Studies in Science and Technology. Dissertations

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Additive manufacturing (AM), also known as 3D printing, offers great design flexibility for manufacturing components with complex geometries, and has attracted significant interest in the aero and energy industries in the past decades. Among the commercial AM processes, selective laser melting (SLM) and electron beam melting (EBM) are the two most widely used ones for metallic materials. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties, weldability and low cost. Due to its excellent weldability, IN718 has been intensively applied in the AM filed, to gain more understanding of the AM processes and fully realize AM's potentials. The study objects in the present thesis include both EBM and SLM IN718. The solidification conditions in EBM and SLM are very different and are different to that of conventional cast, leading to unique microstructures mechanical properties. Therefore, this thesis aims to gain better understanding of the microstructures and anisotropic mechanical behaviours of both EBM and SLM IN718, by detailed characterizations and by comparisons with the forged counterpart. The as-built microstructure of EBM IN718 is spatially dependent: the periphery (contour) region has a mixture of equiaxed and columnar grains, while the bulk (hatch) region has columnar grains elongated along the building direction; the last solidified region close to the top sample surface shows segregation and Laves phases, otherwise the rest of the whole sample is well homogenized. Differently, the as-built microstructure of SLM IN718 is spatially homogeneous: the grains is rather equiaxed and with subgrain cell structures. These microstructures also respond differently to the standard heat treatment routines for the conventional counterparts. Anisotropic mechanical properties are evident in the room temperature tensile tests and high temperature dwell-fatigue tests. The anisotropic tensile properties of EBM IN718 at room temperature are more likely due to the directional alignment of porosities along the building direction rather than the strong crys-In these papers I have been the main contributor, performing all the experimental work, characterization, analysis and manuscript writing, under the supervision of Johan Moverare and Ru Lin Peng.

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“…was used. Table 1 lists the different heat treatment conditions used in this paper, based on previous heat treatments on RR1000 [7,8]. The as-received sample had followed the process route of solution heat treatment, aging (760°C/16 hrs) followed by forging.…”

Section: Methodsmentioning

confidence: 99%

Influence of Heat Treatment on the Conductivity of Nickel-Based Superalloys

Castagne

Annamalai

Zheng

et al. 2015

MATEC Web of Conferences

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Abstract. Non-destructive measurement of residual stress at the subsurface of nickel-based alloys using eddy current method has been limited by its sensitivity to its microstructure, especially to the precipitates. This paper investigates the effect of heat treatment on the electrical conductivity of RR1000, a nickel-based superalloy with a large fraction of J' precipitates. Different heat treatment conditions, ranging from solution heat treatment to precipitation hardening with different aging times and temperatures, are used to achieve varying initial microstructures. Hardness of the samples is measured first to quantify the heat treated samples followed by the measurement of electrical conductivity using the conductivity probes of frequencies between 1 MHz and 5 MHz. The relationship between the hardness and conductivity of the heat treated samples is then correlated further. The results highlight the significant influence of heat treatment on the sample hardness and the electrical conductivity of RR1000.

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Comparison of fatigue crack propagation in nickel base superalloys RR1000 and Udimet 720Li

Cited by 16 publications

References 34 publications

Evaluation of single crystal elastic stiffness coefficients of a nickel-based superalloy by electron backscatter diffraction and nanoindentation

Evaluation of single crystal elastic stiffness coefficients of a nickel-based superalloy by electron backscatter diffraction and nanoindentation

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Influence of Heat Treatment on the Conductivity of Nickel-Based Superalloys

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