Exploring performance limits of a new martensitic high strength steel by ausforming via equal channel angular pressing

Strength and toughness limits of a newly developed low alloy martensitic steel are explored using impact toughness experiments and room temperature tensile testing. These steel samples are subjected to either a selected heat treatment, to obtain tempered martensite, or equal channel angular pressing...

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Bibliographic Details
Published in:Scripta materialia 2020-07, Vol.184, p.63-69
Main Authors: Vaughan, M.W., Samimi, P., Gibbons, S.L., Abrahams, R.A., Harris, R.C., Barber, R.E., Karaman, I.
Format: Article
Language:English
Subjects:
Advanced high strength steels
Grain refinement
Impact toughness
Martensitic steels
Severe plastic deformation
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Summary:Strength and toughness limits of a newly developed low alloy martensitic steel are explored using impact toughness experiments and room temperature tensile testing. These steel samples are subjected to either a selected heat treatment, to obtain tempered martensite, or equal channel angular pressing (ECAP) performed between 950 °C and 1050 °C, to refine prior austenite grains. Martensite refinement through ECAP led to a significantly enhanced mechanical response, resulting in impact toughness above 55 J at -40 °C and ultimate tensile strengths above 2 GPa at room temperature. Consequently, this new low alloy steel can be an excellent candidate for high specific strength transportation applications. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.03.011