Segregation and morphology on the surface of ferritic stainless steel (0Â 0Â 1)

► We studied the segregation and morphology on the surface of ferritic stainless steel (0 0 1) by STM, LEED, AES, and LEELS. ► At 500 °C, segregated oxygen on ferritic steel (0 0 1) surface formed Cr4O5. ► At 600 °C, carbon and chromium co-segregated to on the surface, forming the CrC structure. ► At 700 °C, nitrogen segregated to the surface, forming the CrN structure.