open access

https://hdl.handle.net/2115/74709

Formation and wear resistance of composite - hardened layer in centrifugally cast Al-Ni-Si duplex pipes

日本語

solidification

2005-04-25

日本鋳造工学会

Journal of Japan Foundry Engineering Society

77(4)

233-239

The solidification structure, hardness and wear resistance of Al-Ni-Si duplex pipes produced by two-step centrifugal casting were investigated. In this process, two kinds of molten metals, i.e., first melt and second melt with higher liquidus temperature, were cast in sequence at a given interval into a rotating mold of a centrifugal caster. Al-12mass%Si alloy and Al-30mass%Ni alloy were used as the first melt and the second melt respectively. The second melt was cast after the solidified shell of the first melt had formed. The centrifugally cast pipes consisted of an outer layer and a composite layer containing fine Al-Ni intermetallic crystals. The origin of the outer layer was a survived part of the solidified shell of the first melt. The composite layer consisted of one or two layer(s). When the volume of the remelted part of the solidified shell was large, all the second melt mixed into the first melt and the resultant mixed melt formed the composite layer. On the other hand, the composite layer originated only in the second melt when the temperature of the solidified shell was low. In the intermediate case, the composite layer consisted of these two types of layers. The composite layer which formed from the mixed melt exhibited higher wear resistance than the other type of layer despite its lower hardness.

学術雑誌論文

Version of Record

1342-0429

2185-5374

AN10514770