The development of new-typed air-cooled Mn-series bainitic steels

摘要

The recent development and its superiorities of air-cooled Mn-series bainitic steels are summarized based on the microstucture characters and strengthening and toughening principle. The novel series of bainitic steels are alloyed with common Mn and several series bainitic duplex microstructures can be easily obtained under the condition of air cooling through unique composition design. Some new kind of Mn-series air-cooled bainitic steels with special microstructures, such as granular bainite, grain-boundary allotriomorphic ferrite/granular bainite duplex microstructure, carbide free bainite/martensite duplex microstructure are presented in this paper. Furthermore, the applications in different fields of these Mn-series air-cooled bainitic steels with different strength level are also introduced.