Morphological Study of Oxide Scales and Iron Substrate Surfaces Formed at Elevated Temperatures
1977 年 18 巻 10 号 p. 721-726
詳細
1977 年 18 巻 10 号 p. 721-726
A detailed observation of substrate surfaces and oxide scales after oxidation of iron coupon specimens in purified oxygen in a temperature range 973 to 1173 K for varying periods up to 60 ks has been made using a scanning electron microscope.
Many metal ridges and a small number of metal protrusions were formed on the substrate during oxidation. Blistering was also observed during cooling after short oxidation periods at 1073 and 1173 K.
Possible mechanisms for the formation of these ridges, protrusions and blisters have been discussed. It is suggested that there are certain sites where the formation of protrusions and blistering are favoured, and that a partial separation of scale followed by its recontact with the substrate occurs during oxidation.
It is further suggested that for the above oxidation characteristics the behaviour of vacancies transported to the scale/metal interface, oxide growth stresses and oxide plasticity are influential factors.
