Transformation-induced plasticity in an ultrafine-grained steel: An in situ neutron diffraction study

Kaixiang Tao, Hahn Choo, Hongqi Li, Bjørn Clausen, Jae Eun Jin, Young Kook Lee

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An ultrafine-grained steel with an average grain size of about 350 nm was developed. The tensile testing at ambient temperature shows a threefold increase in the yield strength compared to its coarse-grained counterpart. Moreover, the increase in the strength was achieved without the sacrifice of the ductility due to strain-induced martensitic transformation. The evolution of lattice strains and phase fractions of the austenite and martensite phases during the deformation was investigated using in situ neutron diffraction to provide a micromechanical understanding of the transformation-induced plasticity responsible for the combination of high strength and ductility.

Original languageEnglish
Article number101911
JournalApplied Physics Letters
Issue number10
Publication statusPublished - 2007 Mar 16


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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