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Influence of cooling rate on the hot cracking formation of nickel rich alloys
KTH, Superseded Departments, Materials Science and Engineering.
2002 (English)In: ISIJ International, ISSN 0915-1559, Vol. 42, no 5, 512-519 p.Article in journal (Refereed) Published
Abstract [en]

Hot cracking formation and its mechanism in invar alloys (Fe-36mass%Ni) during continuous casting was investigated. The invar alloy is very sensitive to hot cracking due to its low transition temperature of brittle to ductile fracture even though its solidification interval is narrow. At the cooling rate of 10degreesC/min the transition temperature of brittle to ductile fracture is about 113degreesC below the solidus temperature. An increased cooling rate in invar alloy increases transition temperature of brittle to ductile fracture. It is increased to about 43degreesC below the solidus temperature when the cooling rate is increased to 100degreesC/min. A mechanism of hot cracking formation in invar alloys has been proposed. Hot cracks in invar alloys with a fast cooling rate are formed between the primary dendrites due to the equiaxed solidification structure. However, at slow cooling rate, hot cracks are formed between the grain boundaries due to the columnar structure.

Place, publisher, year, edition, pages
2002. Vol. 42, no 5, 512-519 p.
Keyword [en]
hot ductility, unidirectional solidification, solidification crack, solidus temperature, liquidus temperature, strength, micro-cavity, fracture surface, solidification, ductility, steels
URN: urn:nbn:se:kth:diva-21555ISI: 000175667300008OAI: diva2:340253
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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