Abstract
The development of Cr-depleted zones due to the precipitation of M23C6 at grain boundaries during the ageing of niobium and titanium stabilized austenitic stainless steels (base composition Fe 17 % Cr 12.5% Ni) at 750‡ C has been studied by STEM/EDX. The chromium composition profiles in high angle grain boundaries were found to be similar both in the vicinity of intergranular M23C6 carbides and at boundary segments between them, i.e. the whole grain boundary area acted as a collector plate to supply the growing M23C6 with chromium. Cr-depleted zones did not develop at coherent twin boundaries in the same way as at ordinary high angle boundaries. No major difference in the width or depth of the depleted zones was observed for the niobium and titanium stabilized alloys except for a weak persistence at 100 h in the niobium containing alloy. The error function solution of Fick's second law for diffusion was found to give a good approximation of the depleted zones in the early stages of ageing.
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Thorvaldsson, T., Dunlop, G.L. Grain boundary Cr-depleted zones in Ti and Nb stabilized austenitic stainless steels. J Mater Sci 18, 793–803 (1983). https://doi.org/10.1007/BF00745578
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DOI: https://doi.org/10.1007/BF00745578