In Situ Diagnostics of Damage Accumulation in Ni-Based Superalloys Using High-Temperature Computed Tomography

Kageyama, Koji; Adziman, Fauzan; Alabort, Enrique; Sui, Tan; Korsunsky, Alexander M.; Reed, Roger C.

doi:10.1007/s11661-018-4737-6

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…Because the three-dimensional observations provide significant information on the microstructure evolution in the three-dimensional space, time-resolved in situ tomography (referred to as 4D-TC) has been developed [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For example, the late stage of solidification of Al-4mass%Cu alloys (1 mm in diameter, cooling rate of 0.1 K/s) was observed using a pink beam (peak energy of 40 keV) to increase the transmission X-ray intensity [19].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of dendritic growth by fast tomography and phase field filtering

Yasuda,

Nishiguchi,

Xue

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Three dimensional models of dendritic structures during solidification are valuable for building physical models, validating simulated results, estimating some properties such as permeability in the mushy, simulating semisolid deformation and so on. Thus, it is of interest to observe microstructure evolution in situ. Time-resolved tomography combined with X-ray diffraction has allowed us to observe the evolution of dendritic structures and to measure crystallographic orientation in situ. Reconstruction still proves to be difficult for some alloy systems because of the tradeoff between time and spatial resolution. This paper demonstrates the reconstruction of dendritic structures for three different alloy systems (Al-10mass%Cu alloy with a diameter of 4 mm, CrMnFeCoNi alloy with 1 mm, and Zn-4mass%Al alloy with 0.7 mm). The observations were performed in a synchrotron radiation facility SPring-8. A filter using a phase field model was introduced to reconstruct the three-dimensional images. Parameters used in the filtering were consistently determined based on the raw reconstruction images. Evaluation of solid-liquid interface area and curvature was significantly improved by the filter. For the Al-Cu alloy, a three-dimensional model containing approximately 300 million voxels was obtained. For the CrMnFeCoNi alloys, the preferred growth direction <100> was confirmed by tomography and X-ray diffraction. For the Zn-Al alloy, the observed 14 growth directions were not simply defined by the crystallographic orientations, although the directions were consistent with the hexagonal symmetry. This study verifies that time resolved tomography, X-ray diffraction and the filter using a phase field model provide three dimensional models for light metal alloys with rather large diameters and 3d transition-metal alloys with rather large X-ray absorption coefficients. The models are expected to be used for further studies.

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Section: Introductionmentioning

confidence: 99%

Reconstruction of dendritic growth by fast tomography and phase field filtering

Yasuda,

Nishiguchi,

Xue

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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X-ray Computed Tomography for the ex-situ mechanical testing and simulation of additively manufactured IN718 samples

Ziółkowski¹,

Gruber²,

Tokarczyk³

et al. 2021

Additive Manufacturing

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An in situ microtomography apparatus with a laboratory x-ray source for elevated temperatures of up to 1000 °C

Zhu

Yang

et al. 2021

Review of Scientific Instruments

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An elevated-temperature in situ microtomography apparatus that can measure internal damage parameters under tensile loads at high temperatures up to 1000 °C is developed using a laboratory x-ray source. The maximum resolution of the apparatus can reach 3 µm by a reasonable design. A high-temperature environment is accomplished by means of a heating chamber based on a radiation technique using four halogen lamps with ellipsoidal reflectors. To obtain high resolution, the chamber is much smaller in the direction of the x-ray beam than in the other two directions. Two thin aluminum windows are chosen as the chamber walls perpendicular to and intersecting the x-ray beam. A material testing machine equipped with two synchronous rotating motors is specially designed for mechanical loading and 360° rotation of the specimen, and customized grips are developed to conduct tensile tests. A microfocus x-ray source and a high-resolution detector are used to produce and detect X rays, and the distances among the x-ray source, specimen, and high-resolution detector can be adjusted to obtain different resolutions. To show the main functions and usability of the apparatus, carbon-fiber-reinforced silicon-carbide matrix specimens are subjected to in situ x-ray microtomography tensile tests at 800 °C and 1000 °C, and the crack propagation behavior under thermomechanical coupling loads is studied.

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In Situ Diagnostics of Damage Accumulation in Ni-Based Superalloys Using High-Temperature Computed Tomography

Cited by 4 publications

References 33 publications

Reconstruction of dendritic growth by fast tomography and phase field filtering

Reconstruction of dendritic growth by fast tomography and phase field filtering

X-ray Computed Tomography for the ex-situ mechanical testing and simulation of additively manufactured IN718 samples

An in situ microtomography apparatus with a laboratory x-ray source for elevated temperatures of up to 1000 °C

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