Revealing the superplastic deformation behaviors of hot rolled 0.10C5Mn2Al steel with an initial martensitic microstructure

A hot rolled 0.10C5Mn2Al steel with an initial martensitic microstructure was tensile deformed in a temperature range of 600–1100°C. It was found that a maximum elongation to failure of 340% and a relative high strain rate sensitivity of ~0.24–0.36 were obtained at 800°C under an initial strain rate...

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Bibliographic Details
Published in:Scripta materialia 2018-07, Vol.152, p.27-30
Main Authors: Cao, Zhaoxi, Wu, Guilin, Sun, Xinjun, Wang, Chang, Ponge, Dirk, Cao, Wenquan
Format: Article
Language:English
Subjects:
Low carbon martensitic steel
Medium manganese steel
Substitutional element partitioning
Superplasticity
Ultrafine microduplex structure
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Summary:A hot rolled 0.10C5Mn2Al steel with an initial martensitic microstructure was tensile deformed in a temperature range of 600–1100°C. It was found that a maximum elongation to failure of 340% and a relative high strain rate sensitivity of ~0.24–0.36 were obtained at 800°C under an initial strain rate of 10−3/s. The superplasticity of the hot rolled steel was attributed to the formation of lath-typed ultrafine α+γ microduplex structure and the microstructure stabilization enhanced by substitutional element partitioning during superplastic deformation. The present results provide a promising way to develop superplastic steels with non-ideal initial superplastic microstructures. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.03.046