Fe-Ni-Cr,Fe-Cr-Ni3層電析層の拡散
1980 年 66 巻 9 号 p. 1343-1350
詳細
1980 年 66 巻 9 号 p. 1343-1350
The study of diffusion coating on iron has been carried out.. The object of this study is how the surface laver of iron can be converted into an Fe-Ni-Cr alloy such as austenitic stainless steel.
The diffusion process chosen for this experiment was solid state process, which was carried out by prep· aration of ternary metal layers by means of electrodeposition in an order nickel-chromium or chromiumnickel on substrate, followed by heat treatment in the temperature range from 600°C to 1000°C. In the previous paper, data on the diffusion couples consisting of Fe-Cr, Fe-Ni or Cr-Ni, were given. On the basis of these information and thickness of the interface layer in the ternary layers, the time to associate together three elements and the thickness of the diffusion layers consisting of the three elements were pre sumed.
The time to associate was in accord with that assumed, but the thickness of the diffusion layers were greater than the expected value. The thickness and composition of the diffusion layers were determined by optical microscopy and electron probe micro analysis. One of the reasons that the latter results were shown, is considered that nickel dissolving iron or chromium has penetrated rapidly into grainboundaries.
