Fabrication of an ultrafine-grained structure by a compositional pinning technique

摘要: Abstract A new metallurgical process for fabricating ultrafine-grained alloys by a compositional pinning technique is proposed. Fe–10Mn–0.2C alloy was prepared vacuum induction melting, and the substitutional alloying element Mn partitioned annealing in austenite + ferrite region. After partitioning, specimens were reheated to austenite temperature cooled at varying cooling rates or cold rolled recrystallized. Specimens quenched slowly after reheating showed ferrite-plus-austenite layered structures, while cold-rolled recrystallized equiaxed grain structures of ferrite plus austenite. The average size (or layer thickness) 700 MPa tensile strength >1100 MPa. Tensile elongation shortest, ∼20%, quench tempered steel, ∼40% steels. Possible reasons difference behavior are discussed. This opens way industrial production various grades through modification composition thermomechanical processing route.