Abstract
The Hall–Petch relationship is investigated to find the yield strengths of two high Mn austenitic steels. The Hall–Petch coefficient is found to depend on the overall C concentration and cooling rate, which suggests that the C concentration at the grain boundaries is an important factor. The pile-up model suggests that C raises the stress for the dislocation emission, while the ledge model predicts that C increases the density of ledges which act as dislocation sources.
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