Oxidation or Nitridation Behavior of Pure Chromium and Chromium Alloys Containing 10mass%Ni or Fe in Atmospheric Heating
The oxidation or nitridation behavior of pure chromium and chromium alloys containing 10 mass%Ni or 10 mass%Fe in atmospheric heating was investigated in the temperature range of 1073 to 1373 K. The formation behavior of the outer oxide phase of Cr<SUB>2</SUB>O<SUB>3</SUB> and its growth kinetics in both chromium alloys was very similar to that of pure chromium. The nitride layer with the Cr<SUB>2</SUB>N phase was formed beneath the oxide phase at temperatures above 1273 K in pure chromium. Marked internal nitridation with the formation of the Cr<SUB>2</SUB>N phase was observed in the Cr-10 mass%Fe alloy, while the formation of Cr<SUB>2</SUB>N was negligible in the Cr-10 mass%Ni alloy. Neither Ni nor Fe were detected inside the Cr<SUB>2</SUB>O<SUB>3</SUB> phase, and was enriched in the subsurface layer between the oxide layer and the base alloy in a respective alloy. The Ni-enriched layer in Cr-10 mass%Ni alloy had a relatively narrow width, but a very high concentration of Ni compared with the Fe-enriched layer formed in the Cr-10 mass%Fe alloy.
- Materials transactions
Materials transactions 47(10), 2540-2546, 2006-10-20
The Japan Institute of Metals and Materials