Takehiko Itagaki, Koji Nakazato, Hiroyuki Kutsumi and Shiro Torizuka
Steel Research Center, National Institute for Materials Science, Tsukuba 305-0047
The steam oxidation behavior of Mod.9Cr-1Mo ferritic steel, which was pre-oxidized in air after heavy compressive deformation, was studied. This procedure provided a Cr2O3-type thin oxide layer, which has oxidation protectiveness in high temperature steam atmosphere. The protectiveness of such oxide layer, however, depended on the magnitude of deformation. The thin protective layer which formed on the severely deformed region maintained during the test period of up to 1.44 Ms in steam at 650°C, while thick oxide scale grew on the region provided with less deformation.
(Received November 27, 2002)
ferritic steel, steam oxidation, protective oxide layer, heavy deformation, pre-oxidation
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