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ABSTRACT
Serrated flow in high-Mn lightweight steel was examined in the temperature range of 25–425°C with strain rates of 3.33 × 10−4, 3.33 × 10−3 and 3.33 × 10−2 s−1. Transmission electron microscopy (TEM) analysis showed a bowing dislocation line caused by an interaction between dislocations and the solute in the solid-solution. The activation energy of carbon diffusion for serration generation in this steel was about 40% lower than that of other austenite steels. A first-principles calculation showed that the activation energy of carbon diffusion in high-Mn lightweight steel was 40% lower than that in the conventional austenitic steels.
Disclosure statement
Lightweight steel has a lower activation energy of carbone due to the expanded lattice.
Additional information
Funding
This paper was supported by the materials and component technology development program (10048157) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea) and engineering research center (ERC) program (2011-0030058) funded by Ministry of Education Science and Technology (MEST, Korea). This work was also funded by the fundamental R&D program (Development of technologies for commercial manufacturing of lightweight steels for power plant components, Grant No.: PNK6220) of Korea Institute of Materials Science (KIMS).