Details

Autor(en) / Beteiligte

• Park, Sung-Won
• Park, Jun Young
• Cho, Kyong Mox
• Jang, Jae Hoon
• Park, Seong-Jun
• Moon, Joonoh
• Lee, Tae-Ho
• Shin, Jong-Ho

Titel

Effect of Mn and C on Age Hardening of Fe–Mn–Al–C Lightweight Steels

Ist Teil von

• Metals and Materials International, 2019, 25(3), , pp.683-696

Ort / Verlag

Seoul: The Korean Institute of Metals and Materials

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 κ-carbides. In order to interpret the effect of Mn content, first-principles calculations were conducted using the supercells of Fe 24 Al 8 C 8 , Fe 24 Al 8 C 7 , Fe 24 (Al 7 Mn)C 8 , and Fe 24 (Al 7 Mn)C 7 . The calculations showed that an increase in Mn content could be the source of the delay of the intra-granular κ-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 κ-carbides, which induced the intense age hardening, and coarse inter-granular κ-carbides, which resulted in significant decrease in impact absorbed energy due to inter-granular fracture.