Plastic flow of Fe-binary alloys-I. A description at low temperatures

Y. T. Chen, D. G. Atteridge, W. W. Gerberich

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To provide a working model of the ductile-brittle transition temperature, it is first essential to develop a reasonably complete description of alloying effects on the low-temperature deformation process. In this paper, a semi-empirical plastic flow model for Fe, Fe-Ni and Fe-Si is described. In a sequel, the plastic flow model is applied to predictions of the ductile-brittle transition. For the plasticity description, some rigor has been sacrificed in providing this but the essential features of solid-solution softening and hardening have been retained and justified in terms of detailed measurements of activation enthalpies, activation volumes and strain-rate sensitivities. It is shown that modelling of both the Peierls stress and solid solution strengthening using double-kink nucleation and kink migration approaches can be empirically accomplished with a consistent use of a single atom misfit parameter for each alloy system. For the seven Fe, Fe-Ni and Fe-Si alloys of this investigation, the low temperature deformation is well characterized by a two mechanism approach to yielding. A proposed semi-empirical model offers reasonable prediction of yielding at low temperatures in b.c.c. iron as a function of strain-rate, temperature, substitutional solute additions and grain size.

Original languageEnglish (US)
Pages (from-to)1171-1185
Number of pages15
JournalActa Metallurgica
Issue number6
StatePublished - Jun 1981

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