攀钢U71Mn重轨钢轧后空冷对低频载荷下疲劳裂纹扩展速率的影响  

EFFECT OF AIR COOLING ON FATIGUE CRACKING GROWTH SPEED OF U71Mn HEAVY RAIL STEEL

作　　者：冼爱平[1] 李培基[1] 王仪康[1] 陈仁义[2] 梅东生[2] 

机构地区：[1]中国科学院金属研究所,副研究员沈阳110015 [2]攀枝花钢铁研究院

出　　处：《钢铁》1993年第12期56-59,共4页Iron and Steel

摘　　要：本文在低频(3.33 Hz)载荷下,测定了重轨钢的疲劳裂纹扩展速率,采用板状单边缺口型拉-拉试样,应力比R=0.1。结果表明,攀钢U71Mn重轨钢在疲劳裂纹亚临界扩展阶段,裂纹扩展速率与应力强度因子幅度的关系: da/dN=6.19×10^(-11)ΔK^(3.18)空冷条件下冷却与经过缓冷处理的钢轨相比,在疲劳裂纹亚临界扩展阶段没有明显的差别。在疲劳裂纹扩展的第三阶段,缓冷轨的da/dN偏高。The fatigue cracking growth speed of the U71Mn heavy rail steel produced by Panzhihua Iron & Steel Company are measured by the plate specimens with unilateral notch under a low frequency 3.33 Hz load and stress ratio R=0.1, The results show that the relationship between the fatigue cracking growth speed of the steel in subcritical state and stress intensity factor amplitude can be expressed asda/dN=6.19×10^(-11)△K^(8·13)and there is not a obvious speed difference between the the air cooling and slow cooling treatment. However, it is found that the da/dN of the slow cooling steel rail is higher than that of the air cooling rail in the third stage of the fatigue cracking growth.

关 键 词：重轨钢 疲劳裂纹扩展速率 空冷 缓冷 攀钢 冷处理 试样 冷却 A/D 

分 类 号：TF777[冶金工程—钢铁冶金] TG142[一般工业技术—材料科学与工程]