Study of Al/cast iron interface and graphite behavior
The interface characteristics of aluminum/cast iron bimetals produced by compound casting were investigated. Aluminum melt was poured into molds, at 700°C and 750°C, around cylindrical cast iron bars having melt-to-solid volume ratios (Vm/Vs) of 3, 5 and 8, respectively. Microscopic observa...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391600027A.pdf |
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| Summary: | The interface characteristics of aluminum/cast iron bimetals produced by
compound casting were investigated. Aluminum melt was poured into molds, at
700°C and 750°C, around cylindrical cast iron bars having melt-to-solid
volume ratios (Vm/Vs) of 3, 5 and 8, respectively. Microscopic observations
showed that a reaction layer may form at the interface. This layer is
composed of Fe2Al5 intermetallic which has been formed initially at the
notches of the insert’s surface after making contact with the molten metal.
The thickness of the interaction layer varied from 5μm, for the sample
produced at 700°C and 3 Vm/Vs, up to 20μm for the sample poured at 750°C and
8 Vm/Vs. Microstructural analysis showed that increasing of the temperature
and the melt-to-solid (m/s) volume ratio leads to the formation of a thicker
and more uniform intermetallic layer. Microhardness of the Fe2Al5 compound
was measured 824 HV. A mechanism is suggested for the nucleation and growth
of this intermetallic layer and also encapsulation of the flake graphite at
the interface of two metals. It seems that the thermal and chemical situation
at the interface of two metals, leads to an acceptable wettability of the
graphite by molten aluminum. |
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| ISSN: | 1450-5339 2217-7175 |