Abstract
The stability of intergranular TiC in a 20% Cr-30% Ni, Ti stabilized stainless steel and the transformation of TiC to M23C6, has been investigated as a function of creep deformation over a wide range of stresses at 800° C. It was found that diffusion creep does not make a significant contribution to the general ageing process or to the transformation of TiC to M23C6. However, dislocation creep strongly accelerates this transformation and increases the general rate of coarsening of intergranular carbides. It is concluded that this acceleration occurs through the combined action of an increase in the number of available nucleation sites (extrinsic grain boundary dislocations) and dislocation enhanced diffusion.
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Howell, P.R., Nilsson, J.O. & Dunlop, G.L. The effect of creep deformation on the stability of intergranular carbide dispersions in an austenitic stainless steel. J Mater Sci 13, 2022–2028 (1978). https://doi.org/10.1007/BF00552910
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DOI: https://doi.org/10.1007/BF00552910