Abstract
The investigation of iron, chromium, nickel, carbon, and nitrogen redistribution has been carried out in steel weldments (nitridized carbon steel)/(stainless steel) at 500 up to 1100 °C. It has been found that all elements, substitutional and interstitional, reveal measurable redistribution after the applied diffusion anneals. The redistribution of substitutional elements has the character of interdiffusion and carbon and nitrogen diffuse uphill from the nitridized carbon steel into the stainless steel. Metallographic observations and the shape of measured penetration curves confirmed the occurrence of nitridic zones in CSN 417241 steel. The evaluated diffusion coefficients satisfy Arrhenius relations whose characteristics depend on the structure of the weld joints. The limit concentrations C and N at the weld interface have enabled to calculate the thermodynamic interaction parameters ε_C^Cr, ε_N^Cr, ε_N^C the given steel weldments.

Key words
nitridized carbon steel, stainless steel, iron, chromium, nickel, carbon, and nitrogen redistribution, metallographic observations, diffusion coefficients

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