Abstract
Si-killed steel and five kinds of Fe-550%Ni alloys containing small amounts of Mn and Si were internally oxidized in the temperature range between 1 000° and 1 300°C, and the permeability of oxygen through the alloys were studied. The results obtained were as follows :
(1) In the temperature range lower than about 1 100°C, both the intergranular permeation and the transgranular permeation of oxygen progressed. The rate of the former was larger than that of the latter.
(2) At 1 000°C, the rate of the intergranular permeation in the Si-killed steel was smaller than the rates in 5, 15 and 20%Ni alloys. Among the alloys, the permeation rates decreased with increasing the Ni content.
(3) In the temperature range higher than about 1 100°C, the transgranular permeation was predominant. The permeation rate in the Si-killed steel was larger than the rates in the Fe-Ni alloys. Among the alloys, the permeation rates decreased with increasing the Ni content.
