Synchrotron Radiography Studies of Shear-Induced Dilation in Semisolid Al Alloys and Steels

Gourlay, C.M.; O’Sullivan, Catherine; Fonseca, J.; Yuan, Lang; Kareh, Kristina Maria; Nagira, Tomoya; Yasuda, Hideyuki

doi:10.1007/s11837-014-1029-5

Cited by 14 publications

(6 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The time-resolved and in situ observations showed that solid grains in Al–Cu alloys were also isolated by a liquid film at high solid fractions 47,15 . The solid–liquid interfacial energies and high-angle grain boundary energies for Al–Cu, Al–Si, and Pb–Sn alloys were determined precisely from the shapes of their grain boundary cusps 16 .…”

Section: Resultsmentioning

confidence: 95%

“…Solid grain isolation by liquid film occurs at temperatures below the liquidus temperature but above the solidus temperature, if the grain boundary energy is more than double the solid–liquid interfacial energy. This condition is satisfied in various alloys 15–18 . In addition, pre-melting at the grain boundary below the melting temperature 19–24 has also been reported.…”

Section: Introductionmentioning

confidence: 87%

See 1 more Smart Citation

Dendrite fragmentation induced by massive-like δ–γ transformation in Fe–C alloys

et al. 2019

View full text Add to dashboard Cite

Dendrite arm fragmentation is considered in solidification structure tailoring. Time-resolved and in situ imaging using synchrotron radiation X-rays allows the observation of dendrite arm fragmentation in Fe–C alloys. Here we report a dendrite arm fragmentation mechanism. A massive-like transformation from ferrite to austenite rather than the peritectic reaction occurs during or after ferrite solidification. The transformation produces refined austenite grains and ferrite–austenite boundaries in dendrite arms. The austenite grains are fragmented by the liquid phase that is produced at the grain boundary. In unidirectional solidification, a slight increase in temperature moves the ferrite–austenite interface backwards and promotes detachment of the primary and secondary arms at the δ–γ interface via a reverse peritectic reaction. The results show a massive-like transformation inducing the dendrite arm fragmentation has a role in formation of the solidification structure and the austenite grain structures in the Fe–C alloys.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 87%

Dendrite fragmentation induced by massive-like δ–γ transformation in Fe–C alloys

et al. 2019

View full text Add to dashboard Cite

show abstract

“…A key feature of this framework is that the packing density (solid fraction) of the grains changes during deformation, with grains pushing each other apart at high solid fraction similar to Reynolds" dilatancy [26] in densely packed granular materials [24]. This framework has been confirmed by direct observation of grain rearrangement during semisolid deformation using thin-sample radiography [27][28][29][30][31][32][33][34] and bulk-sample tomography [35][36][37]. However, the combined influences of initial solid fraction and strain rate on semi-solid deformation behaviour, cracking susceptibility, and interstitial liquid flow remain unclear.…”

Section: Introductionmentioning

confidence: 92%

Rheological transitions in semi-solid alloys: In-situ imaging and LBM-DEM simulations

O’Sullivan

Yasuda

et al. 2020

Acta Materialia

Self Cite

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

“…XRD images were observed by a panel-type detector to identify the crystal structure. The technique was extended to observe the semisolid deformation in steel 36,39,40) and to perform in-situ X-ray fluorescence analysis to measure solute partitioning at the solid-liquid interface. 41,42) The advantage of transmission imaging is to observe the microstructure evolution with relatively high temporal and spatial resolutions.…”

Section: X-ray Imagingmentioning

confidence: 99%

Transformation from Ferrite to Austenite during/after Solidification in Peritectic Steel Systems: an X-ray Imaging Study

et al. 2020

View full text Add to dashboard Cite

X-ray transmission imaging with X-ray diffractometry and time-resolved tomography with three-dimensional X-ray diffraction microscopy have been used to observe solidification and transformation in carbon steel and other Fe-based alloys. The imaging techniques showed a massive-like transformation, in which multiple austenite grains were produced in a single δ grain through a solid-solid transformation. The critical velocity from the diffusion-controlled growth of the γ phase to the massive-like transformation was as low as 5 μm/s. X-ray imaging indicated that the δ phase transforms massively to the γ phase in the conventional solidification processes, such as continuous casting. The massive-like transformation and multiple γ grains that were produced in the transformation were related to the subsequent microstructure evolution and casting defect formation. Solidification model including the massive-like transformation is expected to improve our understanding the solidification and the related phenomena in the peritectic steel systems.

show abstract

Synchrotron Radiography Studies of Shear-Induced Dilation in Semisolid Al Alloys and Steels

Cited by 14 publications

References 38 publications

Dendrite fragmentation induced by massive-like δ–γ transformation in Fe–C alloys

Dendrite fragmentation induced by massive-like δ–γ transformation in Fe–C alloys

Rheological transitions in semi-solid alloys: In-situ imaging and LBM-DEM simulations

Transformation from Ferrite to Austenite during/after Solidification in Peritectic Steel Systems: an X-ray Imaging Study

Contact Info

Product

Resources

About