The effect of heat treatment on the toughness, hardness and microstructure of low carbon white cast irons

Zhang, M. X., Kelly, P. M. and Gates, J. D. (2001) The effect of heat treatment on the toughness, hardness and microstructure of low carbon white cast irons. Journal of Materials Science, 36 16: 3865-3875. doi:10.1023/A:1017949600733


Author Zhang, M. X.
Kelly, P. M.
Gates, J. D.
Title The effect of heat treatment on the toughness, hardness and microstructure of low carbon white cast irons
Journal name Journal of Materials Science   Check publisher's open access policy
ISSN 0022-2461
Publication date 2001-01-01
Year available 2001
Sub-type Article (original research)
DOI 10.1023/A:1017949600733
Open Access Status Not yet assessed
Volume 36
Issue 16
Start page 3865
End page 3875
Total pages 11
Editor W. Bonfield
Place of publication USA
Publisher Kulwer Academic
Language eng
Subject C1
291403 Alloy Materials
670801 Iron and steel (e.g. ingots, bars, rods, shapes and sections)
Abstract The effect of destabilisation and subcritical heat treatment on the impact toughness, hardness, and the amount and mechanical stability of retained austenite in a low carbon white cast iron have been investigated. The experimental results show that the impact energy constantly increases when the destabilisation temperature is raised from 950 degreesC to 1200 degreesC. Although the hardness decreases, the heat-treated hardness is still greater than the as-cast state. After destabilisation treatment at 1130 degreesC, tempering at 200 to 250 degreesC for 3 hours leads to the highest impact toughness, and secondary hardening was observed when tempering over 400 degreesC. The amount of retained austenite increased with the increase in the destabilisation temperature, and the treatment significantly improves the mechanical stability of the retained austenite compared with the as-cast state. Tempering below 400 degreesC does not affect the amount of retained austenite and its mechanical stability. But the amount of retained austenite is dramatically reduced when tempered above 400 degreesC. The relationship between the mechanical properties and the microstructure changes was discussed. (C) 2001 Kluwer Academic Publishers.
Keyword Materials Science, Multidisciplinary
Abrasion Resistance
Fracture-toughness
Wear-resistance
Austenite
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 15 Aug 2007, 02:14:30 EST