1989 Volume 75 Issue 5 Pages 766-773
Rapid solidification process produces fine grains and macro-segrigation free microstructures and improves hot-workability of highly-alloyed metals (e.g. superalloys and high alloy steels).
The Osprey process is a spray deposition technique which is one of the rapid solidification methods.
This process provides a means of producing dense preforms directly from liquid metal by applying a gas atomizing. Therefore, this process retains most of advantages resulting from rapid solidification and powder metallurgy, while eliminates major disadvantages resulting from multi stage process (e.g. powder production, sizing, compaction and sintering).
In the present investigation, Osprey process has been applied to mill rolls satisfactorily.
Results obtained are as follows ;
1) Fine grain size was obtained by changing operational parameters.
2) Osprey preform with higher mechanical properties compared with conventional cast preform was obtained.
3) The wear amount of Osprey product is 1/2 to 1/6 of conventional cast one in wearing test.
4) Actually, the life of Osprey rolls tested in a wire-rod mill exceeded that of conventional ones by two to three times.
