<i>In situ</i> time resolved X‐ray diffraction using synchrotron

Komizo, Yu-ichi; Terasaki, Hidenori

doi:10.1179/136217110x12785889549822

Cited by 18 publications

(10 citation statements)

References 34 publications

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“…In situ synchrotron X-ray diffraction and radiographic imaging is increasingly applied to reveal the non-equilibrium nature and dynamics of AM processing 16 – 21 . The most advanced setup reported so far combines in situ high-speed synchrotron X-ray radiography and diffraction to reveal the dynamics of melt pool formation in PBF of Ti-6Al-4V 19 .…”

Section: Introductionmentioning

confidence: 99%

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Kenel

Grolimund

et al. 2017

Sci Rep

119

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We present combined in situ X-ray diffraction and high-speed imaging to monitor the phase evolution upon cyclic rapid laser heating and cooling mimicking the direct energy deposition of Ti-6Al-4V in real time. Additive manufacturing of the industrially relevant alloy Ti-6Al-4V is known to create a multitude of phases and microstructures depending on processing technology and parameters. Current setups are limited by an averaged measurement through the solid and liquid parts. In this work the combination of a micro-focused intense X-ray beam, a fast detector and unidirectional cooling provide the spatial and temporal resolution to separate contributions from solid and liquid phases in limited volumes. Upon rapid heating and cooling, the β ↔ α′ phase transformation is observed repeatedly. At room temperature, single phase α′ is observed. Secondary β-formation upon formation of α′ is attributed to V partitioning to the β-phase leading to temporary stabilization. Lattice strains in the α′-phase are found to be sensitive to the α′ → β phase transformation. Based on lattice strain of the β-phase, the martensite start temperature is estimated at 923 K in these experiments. Off-axis high speed imaging confirms a technically relevant solidification front velocity and cooling rate of 10.3 mm/s and 4500 K/s, respectively.

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Section: Introductionmentioning

confidence: 99%

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Kenel

Grolimund

et al. 2017

Sci Rep

119

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“…Benefited from the progress of microtesting technology, many new techniques, including scanning electron microscopy (SEM) [4], computerized tomography (CT) [5], and X-ray diffraction analysis (XRD) [6], have been applied to the testing of concrete pore structure and the characterization of their components. Much research has been performed on the macroscopic characterization and microscopic mechanism of the mechanical property degradation of concrete after freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Static Stress‐Strain Relationship and Failure Mode for Freeze‐Thaw Concrete

Yang

Wang

et al. 2020

Advances in Civil Engineering

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To analyze the causes of failure of cubic concrete test specimens under quasistatic axial compression, microtests and finite element numerical simulation of C40 cubic concrete test specimens were conducted without the freeze-thaw cycle and with 50 freeze-thaw cycles. Based on the analysis of the microstructure of concrete, the variation law of the full curve of stress and strain was analyzed by the uniaxial compression test and the splitting tensile test of concrete. The results show that freeze-thaw damage is mainly caused by the cyclic reciprocating stress of the micropore structure inside the concrete. The peak stress of concrete uniaxial compression and splitting tensile strength gradually decrease with the number of freeze-thaw cycles; the full stress-strain curve tends to shift downward and to the right. Finite element analysis shows that under the quasistatic uniaxial compression loading condition, the stress and strain fields in the test specimens are symmetrically distributed but nonuniform. The plastic deformation of the concrete weakens the nonuniformity of the stress distribution and is closer to the experimental failure morphology.

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“…The TRXRD data obtained during welding needs to be combined with the appropriate temperature history to obtain the phase transformation kinetic data. The LSCM technique can give us information such as the morphological development of microstructures and precise temperature 31,32) .…”

Section: Introductionmentioning

confidence: 99%

“…Photograph of the experimental setup at the 46XU beam-line at SPring-8 in Hyogo, Japan Hybrid in-situ observation system in real and reciprocal lattice space31) …”

mentioning

confidence: 99%

Hybrid System for In Situ Observation of Microstructure Evolution in Steel Materials

Komizo

Zhang

Terasaki

2014

In-Situ Studies With Photons, Neutrons and Electrons Scattering II

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A new technique, based on the combination of time-resolved X-ray diffraction (TRXRD) and high-temperature laser scanning confocal microscopy (LSCM), was developed for direct observation of morphological evolution and simultaneous identification of the phases. TRXRD data and LSCM images under the desired thermal cycles were measured simultaneously. In several observation examples, the microstructural evolutions in the steel materials were observed to investigate the phase transformation kinetics under the thermal cycle of rapid heating and cooling.

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In situ time resolved X‐ray diffraction using synchrotron

Cited by 18 publications

References 34 publications

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

In situ investigation of phase transformations in Ti-6Al-4V under additive manufacturing conditions combining laser melting and high-speed micro-X-ray diffraction

Numerical Simulation of Static Stress‐Strain Relationship and Failure Mode for Freeze‐Thaw Concrete

Hybrid System for In Situ Observation of Microstructure Evolution in Steel Materials

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