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7 贝氏体钢轨在室温和-40 ℃下的疲劳裂纹扩展速率与应力强度因子范围(da / dN-ΔK)曲线

Fig.7 da / dN-ΔK (fatigue crack propagation rate (da / dN) versus stress intensity factor range (ΔK)) curves of bainitic rail steel at RT and -40 oC (The constant m represents the slope of the fitted line)