Predicting the strength and ductility of ultrafine grained interstitial free steels using irreversible thermodynamics

Huang, Minqxin and Rivera-Díaz-Del-castillo, Pedro E.J. and Bouaziz, Olivier and Zwaag, Sybrand Van Der (2008) Predicting the strength and ductility of ultrafine grained interstitial free steels using irreversible thermodynamics. In: New Developments on Metallurgy and Applications of High Strength Steels, Buenos Aires 2008 - Proc. Int. Conf. New Developments on Metallurgy and Applications of High Strength Steels. UNSPECIFIED, ARG, pp. 805-812.

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Abstract

A novel grain size dependent strain hardening model is derived from the theory of irreversible thermodynamics. The model yields the evolution of the dislocation densities in the grain interior and at the grain boundary, as well as their contributions to the flow stress. It is found that sub-micron grain sizes have a lower dislocation density in the grain interior, causing ductility to decrease greatly. The predicted stress-strain curve shapes, uniform elongation and ultimate tensile strength values for interstitial free steels show good agreement with experimental observations.

Item Type: Contribution in Book/Report/Proceedings
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2500/2506
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 125473
Deposited By: ep_importer_pure
Deposited On: 24 May 2018 13:20
Refereed?: Yes
Published?: Published
Last Modified: 25 Feb 2020 05:23
URI: https://eprints.lancs.ac.uk/id/eprint/125473

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