FANG Hongsheng
,
FENG Chun
,
ZHENG Yankang
,
YANG Zhigang
,
BAI Bingzhe
钢铁研究学报(英文版)
The development and mechanical performances of new type aircooled Mn series bainitic steels including granular bainitic steels, FGBA/BG duplex steels, CFB/M duplex steels, medium carbon bainite/martensite steels, cast bainitic steels invented by the authors are summarized. The novel series of bainitic steels are alloyed with Mn, and several series bainitic duplex microstructures can be easily obtained under the condition of air cooling through unique composition design. The invented idea, the principle of alloying design, the strengthening mechanism, and the evolution of the microstructure of new type aircooled Mn series bainitic steels are presented. Furthermore, the applications in different fields of these Mn series aircooled bainitic steels with different strength level are also introduced. It is suggested that the significance of the development of the aircooled Mn series bainitic steel can be summarized as follows: reducing costs of both raw materials and production; good combination of strength and toughness; selfhardening with high bainitic hardenability by air cooling from hot working without additional quenchingtempering treatment or quenching procedure; large savings in energy resources; and reduced environmental pollution.
关键词:
bainite;bainitic steel;microstructure;mechanical property;air cooling
