RESEARCH ASPECTS OF TRANSFORMATION AND APPLICATION OF BAINITE AND MARTENSITE
贝氏体与马氏体相变及应用的研究

The key and most recent research results on bainite transformation obtained by Phase Transformation and Multi-Phase New Materials Research Group of Tsinghua University have been generalized in this paper,including the objective and popular existence of three-dimensional super and nanometer scale ledges, the mobility of ledge risers, internal ultra fine structure of bainitic plates, the characteristic and nature of bainitic surface reliefs, the source and formation models of bainitic carbide, STM and AFM studies of martensitic surface reliefs, etc. The sympathetic nucleation and ledgewise growth (SNLG) formation mechanism of bainite has been further described, and applied to interpret the multi-layer complicated substructure. Also the industrial application of air-cooled bainitic/martensitic duplex phase steel has been related.Correspondent: WANG Jiajun, associate professor, (Department of Materials Science and Engineering,Tsinghua University, Beijing 100084)