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Enhancement of Superplastic Properties in Ultrahigh Carbon Steel through Silicon Addition
Author(s) -
Ruano Oscar A.,
Jimenez Jose A.,
Oyama Toshi,
Sherby Oleg D.
Publication year - 2009
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.2374/sri08sp115_78
Subject(s) - superplasticity , materials science , strain rate , metallurgy , atmospheric temperature range , flow stress , deformation (meteorology) , silicon , alloy , strain (injury) , carbon fibers , stress (linguistics) , composite material , thermodynamics , composite number , medicine , linguistics , philosophy , physics
The superplastic behaviour of ultrahigh carbon steels (UHCS) has been greatly improved by silicon additions and thermomechanical processing. A UHC steel containing 3 wt% Si shows superplastic behaviour in a wide temperature range from 650 to 900°C. This behaviour is observed even at high strain rates, i.e. 10 ‐2 s ‐1 , in the temperature range between 800 and 825°C. Furthermore, the flow stress required for superplastic deformation is reduced drastically, i.e. σ=12 MPa at a strain rate of 10 ‐4 s ‐l . Finally, it is found that the flow stress at a given strain rate is relatively constant over a wide range of temperatures (750‐900°C) due to a unique transformation behaviour in the UHCS‐3Si alloy.