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Alloy design against the solidification cracking in fusion additive manufacturing: An application to FeCrAl alloy

Authors
  • Dovgyy, B
  • Pham, MS
  • Simonelli, M
Publication Date
Apr 25, 2021
Source
Spiral - Imperial College Digital Repository
Keywords
License
Green
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Abstract

This study developed a design methodology against liquid-state cracking by combining the Scheil–Gulliver solidification simulations and Machine Learning analysis to design alloys for Fusion Additive Manufacturing. Applying this design approach resulted in a Fe–20Cr–7Al–4Mo–3Ni. The alloy was successfully printed with relative densities of over 99%. Microstructure of printed material was extensively characterised through scanning and transmission electron microscopy, energy dispersive spectroscopy and x-ray diffraction, confirming a single-phase material with low texture and negligible chemical segregation. Neither solidification nor liquation cracks were detected, supporting the validity of the methodology, however, the alloy suffered from solid-state cracking, hindering the ductility.

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