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Metals 2015, 5(1), 150-161; doi:10.3390/met5010150

Effects of Silicon on Mechanical Properties and Fracture Toughness of Heavy-Section Ductile Cast Iron

1
School of Materials Science and Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
2
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 3 December 2014 / Accepted: 8 January 2015 / Published: 21 January 2015
(This article belongs to the Special Issue Advances in Solidification Processing)
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Abstract

The effects of silicon (Si) on the mechanical properties and fracture toughness of heavy-section ductile cast iron were investigated to develop material for spent-nuclear-fuel containers. Two castings with different Si contents of 1.78 wt.% and 2.74 wt.% were prepared. Four positions in the castings from the edge to the center, with different solidification cooling rates, were chosen for microstructure observation and mechanical properties’ testing. Results show that the tensile strength, elongation, impact toughness and fracture toughness at different positions of the two castings decrease with the decrease in cooling rate. With an increase in Si content, the graphite morphology and the mechanical properties at the same position deteriorate. Decreasing cooling rate changes the impact fracture morphology from a mixed ductile-brittle fracture to a brittle fracture. The fracture morphology of fracture toughness is changed from ductile to brittle fracture. When the Si content exceeds 1.78 wt.%, the impact and fracture toughness fracture morphology transforms from ductile to brittle fracture. The in-situ scanning electronic microscope (SEM) tensile experiments were first used to observe the dynamic tensile process. The influence of the vermicular and temper graphite on fracture formation of heavy section ductile iron was investigated. View Full-Text
Keywords: heavy-section ductile cast iron; silicon content; in situ SEM tensile; fracture toughness heavy-section ductile cast iron; silicon content; in situ SEM tensile; fracture toughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Song, L.; Guo, E.; Wang, L.; Liu, D. Effects of Silicon on Mechanical Properties and Fracture Toughness of Heavy-Section Ductile Cast Iron. Metals 2015, 5, 150-161.

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