Effect of Cr on Strain Ageing Behaviour of Low Carbon Steel
This work explores the effect of Cr addition on the kinetics of strain ageing process. The strain ageing behaviour of low carbon steel with and without 0.7wt% Cr was investigated using transmission electron microscopy (TEM), atom probe tomography (APT) and tensile tests. The results have shown that Cr alloyed steel undergoes the same three stages of ageing as unalloyed low carbon steel. However, the alloying with Cr reduces the rate of strain ageing by ~2 times in comparison with non-alloyed low carbon steel. It especially delays the offset of stage III. This is explained by the reduction of carbon content in ferrite due to the enrichment of cementite with Cr leading to the reduction of its equilibrium solubility in ferrite.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
E. V. Pereloma et al., "Effect of Cr on Strain Ageing Behaviour of Low Carbon Steel", Materials Science Forum, Vols. 539-543, pp. 4214-4219, 2007