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Crystallographic analysis of martensitic transformation in high manganese steels

LU Fa-yun,MENG Li,YANG Ping~,CUI Feng-e(School of materials science and engineering, University of science and technology Beijing, Beijing 100083,China)  
The martensitic transformation in high manganese TRIP/TWIP steels was studied by using EBSD technique. Microstructural characteriastics of ε-martensite and α-martensite were determined. The results show that austenite and ε-martensite held the Shoji-Nishiyama orientation relationship of { 111 }γ( 0002 )ε, 〈 10 〉γ〈 11■0 〉ε, whereas ε-martensite and α-martensite held the Burgers orientation relationship of (0002) ε {110} α, 〈 11■0 〉ε〈 11 〉α. Many α-martensite variants occurred within one austenite grain and abundant transformation twins existed between variants. A preliminery analysis on habit plane of martensites was performed.
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