Fracture transitions in iron: Strain rate and environmental effects

Eric Hintsala, Claire Teresi, Andrew J. Wagner, K. Andre Mkhoyan, William Gerberich

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

A number of recent mechanical property studies have sought to validate atomistic and multiscale models with matching experimental volumes. One such property is the ductile-brittle transition temperature (DBTT). Currently no model exists that incorporates both external and internal variables in an analytical model to address both length scales and environment. Using thermally activated parameters for dislocation plasticity, the present study attempts a small piece of this. With activation energy and activation volumes previously determined for single and polycrystalline Fe-3% Si, predictions of DBTT both with and without atmospheric hydrogen are made. These are compared with standard fracture toughness measurements similarly for samples both with and without atmospheric hydrogen. In the hydrogen-free samples, average strain rate varied by four orders of magnitude. DBTT shifts are experimentally found and predicted to increase 100 K or more with either increasing strain rate or exposure to hydrogen.

Original languageEnglish (US)
Pages (from-to)1513-1521
Number of pages9
JournalJournal of Materials Research
Volume29
Issue number14
DOIs
StatePublished - Jul 28 2014

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