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

Wigger, Tim; Andriollo, Tito; Xu, Chaoling; Clark, Samuel J.; Gong, Zhixuan; Atwood, Robert C.; Hattel, Jesper H.; Tiedje, Niels Skat; Lee, Peter D.; Azeem, Mohammed A.

doi:10.1016/j.actamat.2021.117367

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

Journal Article · Mon Oct 11 04:00:00 EDT 2021 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2021.117367· OSTI ID:1897905

^[1]; ^[2]; Xu, Chaoling ^[2]; ^[3]; Gong, Zhixuan ^[1]; ^[4]; Hattel, Jesper H. ^[2]; Tiedje, Niels Skat ^[2]; ^[1]; ^[5]

Univ. College London (United Kingdom); Research Complex at Harwell, Didcot (United Kingdom)
Technical Univ. of Denmark, Lyngby (Denmark)
Univ. College London (United Kingdom); Argonne National Lab. (ANL), Lemont, IL (United States)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Research Complex at Harwell, Didcot (United Kingdom); Univ. of Leicester (United Kingdom)

Ductile cast irons (DCIs) are of increasing importance in the renewable energy and transportation sectors. The distribution and morphology of the graphite nodules, in particular the formation of degenerate features during solidification, dictate the mechanical performance of DCIs. In situ high-speed synchrotron X-ray tomography was used to capture the evolution of graphite nodules during solidification of DCI, including degenerate features and the effect of the carbon concentration field. The degeneration of nodules is observed to increase with re-melting cycles, which is attributed to Mg-loss. The dendritic primary austenite and carbon concentration gradients in the surrounding liquid phase were found to control nodule morphology by locally restricting and promoting growth. A coupled diffusion-mechanical model was developed, confirming the experimentally informed hypothesis that protrusions form through liquation cracking of the austenite shell and subsequent localised growth. In conclusion, these results provide valuable insights into the solidification kinetics of cast irons, supporting the design of advanced alloys.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Danish Research Council; Research Complex at Harwell; Royal Academy of Engineering

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1897905

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 221; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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