Ductile and High Strength White Cast Iron of Ultrafine Interconnected Network Morphology |
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Authors: | C?M?HO Email author" target="_blank">H?W?KUIEmail author |
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Affiliation: | (1) Department of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, P.R. China;; |
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Abstract: | Fe100–x
C
x
melts (x = 18 to 24) can be cast under B2O3 flux into solids of interconnected network morphology, with a wavelength in the submicron range. There are two major constituent
subnetworks, which are a brittle Fe3C subnetwork and a ductile αFe subnetwork. The Fe100–x
C
x
network alloys, therefore, are white cast iron of novel microstructure. Fe100–x
C
x
specimens of x = 18 to 21 are ductile and the yield strength can be as large as ~3200 MPa. Fe100–x
C
x
specimens of x = 22 to 24 are in the regime of a ductile-to-brittle transition. The compressive strength is high, at ~2700 MPa. Microstructural
analysis indicates that the ultrafine network morphology and the ductile αFe subnetwork are responsible for the ductility exhibited in Fe100–x
C
x
network alloys of x = 17 to 21. They are also responsible for the high compressive strength in Fe100–x
C
x
network alloys of x = 22 to 24. |
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Keywords: | |
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