Abstract
Hot-rolled sheets of 18% Cr stainless steel having dual structures of ferrite and transformed (martensitic) phases were made by water quenching from an temperature in (α+γ) region, 1200°C. The effect quenchphases were made by water quenching from an temperature in (α+γ) region, 1200°C. The effect of the microsegregation of Cr and C on ridging phenomenon was examined using the material annealed with various conditions. The following results were obtained.
(1) Even after the annealing at 800°C for 20h the segregation of Cr which was rich in ferrite phase and poor in prior austenite phase was observed.
(2) Carbon was high in prior austenite phase and was decreased with annealing time.
(3) Precipitation of chromium carbide by annealing was observed much in prior austenite phase.
(4) The carbides were distributed locally in the material even after cold rolling and annealing.
(5) Intensity of ridging was independent on the changes in structure and hardness due to annealing.
(6) The relation between spacings of ridge and of the microsegregation of Cr and C was recognized for small ridges observed at the surface of the specimen, but was not clear for large undulations of ridging.
