贝氏体钢轨的低温疲劳裂纹扩展行为

刘蓉, 高古辉, 桂晓露, 白秉哲

Low-Temperature Fatigue Crack Propagation Behavior of Bainitic Rail Steel

LIU Rong, GAO Guhui, GUI Xiaolu, BAI Bingzhe

图3 贝氏体钢轨母材显微组织的SEM和TEM观察

Fig.3 SEM and TEM observations of base microstructure of bainitic rail steel (a) SEM image of base material (GB—granular bainite, LB—lath bainite, M/A—martensite/austenite) (b) phase map of base material represented by EBSD (c) TEM image showing the blocky M/A island and the twinning martensite (TM) (Inset shows locally enlarged image) (d) TEM image showing the film-like retained austenite (RA) (e, f) TEM bright field image (e) and TEM dark field image and SAED pattern (inset) (f) of blocky RA