Abstract
An age-hardening cold-rolled ultrahigh-strength Fe-0.2C-7Mn-3Al-3Ni (wt.%) steel with large ductility was developed via intercritical annealing and followed by aging. It was observed that aging treatment not only resulted in high density nanosized NiAl intermetallic precipitate but it also strongly affected ferrite-austenite duplex microstructure especially the content and stability of austenite due to the partition of elements. Besides, it was found that aging treatment led to a simultaneous increase in both strength and total elongation, which was attributed to high-density NiAl nanoprecipitate, strong dislocation hardening, much stronger transformation-induced plasticity (TRIP) effect and the involvement of twinning-induced plasticity (TWIP) effect.
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