The effect of the reduction of carbon content on the toughness of high chromium white irons in the as-cast state

Kootsookos, A. and Gates, J. D. (2004) The effect of the reduction of carbon content on the toughness of high chromium white irons in the as-cast state. Journal of Materials Science, 39 1: 73-84. doi:10.1023/B:JMSC.0000007730.00517.65


Author Kootsookos, A.
Gates, J. D.
Title The effect of the reduction of carbon content on the toughness of high chromium white irons in the as-cast state
Journal name Journal of Materials Science   Check publisher's open access policy
ISSN 0022-2461
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1023/B:JMSC.0000007730.00517.65
Open Access Status
Volume 39
Issue 1
Start page 73
End page 84
Total pages 12
Place of publication Netherlands
Publisher Kluwer Academic Publishers
Language eng
Subject C1
291403 Alloy Materials
640304 Concentrating processes of other base metal ores
Abstract Three high chromium white cast irons were examined in the as-cast state to determine the effect of the carbon content on the fracture toughness. The plane strain fracture toughness K-Ic and the fracture strength were measured for each alloy. X-ray mapping was used to identify the phases on the fracture surfaces. Scanning electron fractography and optical microscopy were used to determine the volume fraction of each phase on the fracture surfaces. It was found that most fracture occurred in the eutectic carbides, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites. This change in crack path correlated with an increase in fracture toughness. The Ritchie-Knott-Rice model of brittle fracture was applied. It was found to sensibly predict the critical length for fracture for each alloy. Deep etching was employed to examine the distribution of eutectic carbides. It was found that the eutectic carbides formed a continuous network in each case. (C) 2004 Kluwer Academic Publishers.
Keyword Eutectic Carbide Morphology
Fracture-toughness
Alloys
Behavior
Stress
Q-Index Code C1
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 13:02:25 EST