M. Venkatraman
The limit of Hall-Petch relationship in ultra fine grained steels has been examined based on dislocation pile-up mechanism. When the grain size becomes small, the dislocation multiplicity ceases, resulting in a very low work hardening rate in these materials. An approximate analysis of the theories of hardening indicates that the Hall-Petch relation is obeyed up to 100 nm. Moreover, it appears that grain refinement is not the suggested approach to improve toughness as well as strength below a critical size. This study highlights the complexities involved in the behavior of ultra-fine grained steels and suggests limitations of the traditional grain refinement techniques to enhance mechanical properties in such materials.
@article{5b6c7b90-0647-4c91-ad55-bbdeab4517f0,
title={Some views on the strength and ductility of ultra fine grained steels through micro plasticity approach},
author={M. Venkatraman},
year={2026},
language={en}
}TY - JOUR TI - Some views on the strength and ductility of ultra fine grained steels through micro plasticity approach AU - M. Venkatraman PY - 2026 LA - en ER -
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