Damage micromechanisms in dual-phase steel investigated with combined phase- and absorption-contrast tomography

Toda, Hiroyuki; Takijiri, Akihide; Azuma, Masashi; Yabu, Shohei; Hayashi, Kouichi; Seo, Do Won; Kobayashi, Masakazu; Hirayama, Kyosuke; Takeuchi, Akihisa; Uesugi, Kentaro

doi:10.1016/j.actamat.2017.01.010

Cited by 55 publications

(18 citation statements)

References 29 publications

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“…Moreover, some of the issues of mineral differentiation with µCT can be alleviated by the use of other contrast modes such as diffraction-contrast tomography (DCT) and phase-contrast tomography (PCT), which is mainly available only in synchrotron sources. Both contrast modes have found applications mostly in analysis of microstructures in crystalline samples, as it allows the high contrast between phases [48][49][50][51][52][53]. Synchrotron systems also open up possibilities of complimentary tomography methods such as X-ray diffraction microtomography (XRD-CT) and X-ray Fluorescence microtomography (XRF-CT).…”

Section: Measurementsmentioning

confidence: 99%

X-ray Microcomputed Tomography (µCT) for Mineral Characterization: A Review of Data Analysis Methods

et al. 2019

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The main advantage of X-ray microcomputed tomography (µCT) as a non-destructive imaging tool lies in its ability to analyze the three-dimensional (3D) interior of a sample, therefore eliminating the stereological error exhibited in conventional two-dimensional (2D) image analysis. Coupled with the correct data analysis methods, µCT allows extraction of textural and mineralogical information from ore samples. This study provides a comprehensive overview on the available and potentially useful data analysis methods for processing 3D datasets acquired with laboratory µCT systems. Our study indicates that there is a rapid development of new techniques and algorithms capable of processing µCT datasets, but application of such techniques is often sample-specific. Several methods that have been successfully implemented for other similar materials (soils, aggregates, rocks) were also found to have the potential to be applied in mineral characterization. The main challenge in establishing a µCT system as a mineral characterization tool lies in the computational expenses of processing the large 3D dataset. Additionally, since most of the µCT dataset is based on the attenuation of the minerals, the presence of minerals with similar attenuations limits the capability of µCT in mineral segmentation. Further development on the data processing workflow is needed to accelerate the breakthrough of µCT as an analytical tool in mineral characterization.

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Section: Measurementsmentioning

confidence: 99%

X-ray Microcomputed Tomography (µCT) for Mineral Characterization: A Review of Data Analysis Methods

et al. 2019

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“…The sample distance to source and camera were 2400000 and 53 mm, respectively. During 180 degree of stage rotation with 0.1 degree step, 1800 scans were conducted with an exposure time of 400 ms [25].…”

Section: Fatigue Test Using X-ray Tomographymentioning

confidence: 99%

Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V

Hassanipour

Watanabe

Hirayama

et al. 2018

Materials Science and Engineering: A

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Currently, short crack growth behavior and rate variations are not well understood in the literature. This is due to lack of studies regarding the interaction between 3D short crack and microstructure and its effect on crack growth. In order to study this interaction, in situ computed tomography was performed to measure crack growth at sub-grain level (every 5μm) during a fatigue test in a bimodal Ti-6Al-4V alloy for two crack front regions. This was followed by serial sectioning coupled with electron backscattering diffraction (EBSD) to identify the short crack growth in the microstructure, i.e. α, α+β phases and interface. Results show that crack growth has the highest rate in α phase as compared to the α+β phase and the interface in both regions. The crack grows preferably into α phase when compared to the average microstructural fraction in the first region, but it decreases below this fraction in the second region. The crack grows mainly close to crystallographic planes in α grains with the maximum shear stress (favorable planes) in the first region. As the short crack grows into the second region, there is an increase in number of grains enclosed in the plastic zone size. As a result, there is a decrease in the mismatch angle between neighboring cracked grains, which leads to higher deviation from favorable planes causing a local variation in crack growth rate.

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“…This is mainly due to the complex interaction between phases as well as variation in the mechanical properties of ferrite and martensite [8][9][10][11][12]. On the other hand, it is clear that, damage evolution in dual phase steels occurs in three stages; void initiation, growth and coalescence [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Microscopic investigation of damage mechanisms and anisotropic evolution of damage in DP600

Aşık

Perdahcıoğlu

Boogaard

2019

Materials Science and Engineering: A

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Weight reduction and fuel consumption play an important role on material selection in automotive industry. In this respect, ferritic-martensitic dual phase steels are gaining popularity thanks to their versatile combination of strength and formability. In this study, we investigate evolution of damage and active damage mechanisms in a commercial DP600 steel. Interrupted tensile tests are conducted in both rolling (RD) and transverse directions (TD). Subsequently, damage mechanisms and void evolution is characterized by cross-sectional SEM micrographs. The results reveal that, in both RD and TD, damage occurs by three different damage mechanisms. Namely, void formation due to inclusions, cracking of martensite islands and decohesion between ferrite and martensite. From these damage mechanisms, void formation due to large inclusions occur in the early stages of deformation, whereas the other two are both active throughout the complete stretching. The most commonly observed damage mechanism was martensite cracks and seem to be the primary reason of failure. In addition, void evolution studies clearly show that damaged area as well as number of voids increase more rapidly in RD than TD. Furthermore, in both directions, damage concentrates at the mid plane of the specimens, leading to an inhomogeneous distribution of voids in the thickness direction.

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Damage micromechanisms in dual-phase steel investigated with combined phase- and absorption-contrast tomography

Cited by 55 publications

References 29 publications

X-ray Microcomputed Tomography (µCT) for Mineral Characterization: A Review of Data Analysis Methods

X-ray Microcomputed Tomography (µCT) for Mineral Characterization: A Review of Data Analysis Methods

Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V

Microscopic investigation of damage mechanisms and anisotropic evolution of damage in DP600

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