Time Evolution of Solidification Structure in Ductile Cast Iron with Hypereutectic Compositions

Chatcharit, Kiattisaksri; Sugiyama, A.; Morishita, Kohei; Narumi, Taka; Kajiwara, Kentaro; Yasuda, Hideyuki

doi:10.1007/s40962-020-00424-3

Cited by 5 publications

(10 citation statements)

References 9 publications

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“…X-ray imaging using synchrotron radiation has allowed observation of the solidification behavior in various metallic alloys such as Sn alloys, [7][8][9][10][11][12][13][14][15][16] Al alloys, 9,10,17,18) cast iron, [19][20][21][22][23] Fe-C steels, 11,[24][25][26][27][28] and stainless steels. 29) Installing a deformation device in the observation apparatus, in-situ observation of semisolid deformation by X-ray transmission imaging (referred to as 2D observation hereinafter) was achieved with a high spatial resolution with respect to grain size.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved and <i>in-situ</i> Observation of Semisolid Deformation in Al–Cu Alloys with Equiaxed and Columnar Grain Structures by Using a Combination Technique of 4D-CT and 3DXRD

et al. 2021

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Time-resolved combined absorption tomography and three-dimensional X-ray diffraction was developed to study semisolid deformation of metallic alloys, which combined time-resolved tomography and threedimensional X-ray diffraction microscopy (3DXRD). The combined technique allowed observation of configuration and crystallographic orientation of solid grains, whereby translation and rotation of solid grains induced by interaction between solid grains during semisolid deformation was analyzed. During the compression tests of a semisolid Al-10mass%Cu alloy with the equiaxed grain structure, translation and rotation of solid grains rather than the plastic deformation played a dominant role in the deformation until strain reached − 0.04. In a portion of the specimen, a gap between solid grains expanded owing to the interaction between solid grains, and consequently apparent volume expansion (dilatancy) occurred. The solid grains around the expanded region possessed similar rotational axis directions, which were perpendicular to the normal direction of the expanded region. As the compression proceeded, both translation/ rotation and the plastic deformation of solid grains occurred owing to an increase in physical contact between solid grains. For a semisolid Al-10mass%Cu alloy with the columnar grain structure, solid grain comprised a single crystallographic domain. Inflection of the dendrite arms was confirmed by 3DXRD, where the compression of strain at − 0.25 caused the grain to be inflected up to 12 degrees. The strain distribution in the grain was estimated using the inflection angle. In-situ observation revealed that the behaviors of solid grains and the liquid phase in semisolid alloys during the compression tests differed according to the structure.

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Section: Introductionmentioning

confidence: 99%

Time-resolved and <i>in-situ</i> Observation of Semisolid Deformation in Al–Cu Alloys with Equiaxed and Columnar Grain Structures by Using a Combination Technique of 4D-CT and 3DXRD

et al. 2021

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“…Compared with monochromatic beam, the use of X‐rays with a broader spectrum can substantially improve the temporal resolution, by a factor of ~80–100, to 0.5 s, respectively. Owing to the relatively high temporal resolution, the floating of GPs was captured and shown to stop when the GPs were engulfed by austenite dendrites 20 . Furthermore, secondary nucleation between the primary GPs nucleated earlier and engulfed by austenite dendrites was directly observed.…”

Section: Solidificationmentioning

confidence: 99%

“…By 2D radiography performed using X‐rays with relatively low energy, 16 it is possible to distinguish austenite from liquid and therefore clarify the solidification sequence. New and deeper understanding of the importance of Mg addition on the solidification sequence, 17–19 the nucleation frequency of GPs, 18 as well as the floating of primary GPs 20 have been obtained based on in situ radiographic examinations. However, the 2D radiographic experiments have the natural limitation that the actual sizes and shapes of GPs cannot be determined.…”

Section: Solidificationmentioning

confidence: 99%

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Recent trends in X‐ray‐based characterization of nodular cast iron

Andriollo

Zhang

et al. 2020

Mat Design & Process Comms

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Through various examples, this short review presents the main X‐ray‐based techniques that are available to characterize nodular cast iron at the microstructural level. Emphasis is placed on the enormous potential offered by the recent developments in X‐ray tomography, X‐ray diffraction, and digital volume correlation, which allow collecting microstructural and micromechanical information in 4D (3D plus time) during both casting and subsequent mechanical loading. The goal is to demonstrate that for nodular cast iron, which has an inherently three‐dimensional, composite microstructure, X‐ray‐based techniques provide some significant advantages over conventional microscopy. For this reason, these techniques can be instrumental in unveiling the mechanisms controlling both the formation of the microstructure as well as its micromechanical behavior during in‐service loading, thus paving the way to the development of improved process–structure–property relations.

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“…Synchrotron X-ray light sources have evolved dramatically over the last two decades. With the incorporation of fast acquisition systems it is now possible to capture a vast amount of rich dynamic microstructural information to unravel various underlying mechanisms [16][17][18]. For metallic systems, the first radiographic imaging dataset of dendritic microstructures during solidification was obtained on a Al-30 wt% Cu alloy [19].…”

Section: Introductionmentioning

confidence: 99%

In situ synchrotron investigation of degenerate graphite nodule evolution in ductile cast iron

Wigger

Andriollo

et al. 2021

Acta Materialia

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Time Evolution of Solidification Structure in Ductile Cast Iron with Hypereutectic Compositions

Cited by 5 publications

References 9 publications

Time-resolved and <i>in-situ</i> Observation of Semisolid Deformation in Al–Cu Alloys with Equiaxed and Columnar Grain Structures by Using a Combination Technique of 4D-CT and 3DXRD

Time-resolved and <i>in-situ</i> Observation of Semisolid Deformation in Al–Cu Alloys with Equiaxed and Columnar Grain Structures by Using a Combination Technique of 4D-CT and 3DXRD

Recent trends in X‐ray‐based characterization of nodular cast iron

In situ synchrotron investigation of degenerate graphite nodule evolution in ductile cast iron

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