Journal
METALS AND MATERIALS INTERNATIONAL
Volume 25, Issue 3, Pages 683-696Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-018-00230-x
Keywords
Lightweight steel; Age hardening; kappa-carbide; First-principles calculations; Manganese; Carbon
Funding
- Fundamental R&D Program (Development of technologies for commercial manufacturing of light-weight steels for power plant components) of Korea Institute of Materials Science (KIMS) [PNK5690]
- Materials and Components Technology Development Program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [10048157]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10048157] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [PNK5690] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The effects of Mn and C content on the age hardening of Fe-Mn-Al-C lightweight steels, which have austenitic or duplex (austenite and ferrite) microstructures, were investigated. An increase in Mn content induced a delay of the age hardening that is caused by the formation of intra-granular kappa-carbides. In order to interpret the effect of Mn content, first-principles calculations were conducted using the supercells of Fe24Al8C8, Fe24Al8C7, Fe-24(Al7Mn)C-8, and Fe-24(Al7Mn)C-7. The calculations showed that an increase in Mn content could be the source of the delay of the intra-granular kappa-carbide formation by suppressing C atom' occupation of the vacancy at the body-centered site of L1(2). An increase in C content accelerated the formation of intra-granular kappa-carbides, which induced the intense age hardening, and coarse inter-granular kappa-carbides, which resulted in significant decrease in impact absorbed energy due to inter-granular fracture.
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