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11 不同ΔK时贝氏体钢轨在-40 ℃下的疲劳裂纹扩展路径

Fig.11 Fatigue crack propagation paths of bainitic rail steel tested under various ΔK at -40 oC (a, b) SEM (a) and EBSD (b) images under ΔK = 10.0 MPa·m1/2 (c, d) grain reconstructions of square areas I (c) and II (d) in Fig.11b (e, f) SEM images under ΔK = 17.0 MPa·m1/2