摘要
SS400钢是一种细晶强化的新一代钢铁材料,焊接对其疲劳性能的影响是人们关注的问题。笔者参照美国材料试验学会标准ASTME647 83的规定,采用紧凑拉伸CT试件对SS400钢及其焊接接头CT试件的疲劳裂纹扩展速率进行了测试。发现:母材的疲劳裂纹扩展存在两个不同速率的阶段,焊缝及热影响区的疲劳裂纹扩展速率均低于母材;热影响区的疲劳裂纹扩展速率介于焊缝与母材之间;焊接接头组织和性能的变化并未导致SS400钢疲劳性能的降低。
SS400 is a new generation steel with ultra-fine grain strengthening. The effect of welding process on the fatigue performance is concerned recently. The fatigue crack growth rate has been investigated for SS400 and its welded joint based on the ASTM E647-83 specification. In the test the compact tension (CT) specimens were used. It is found that there exist two stages with different fatigue crack growth rate for the test steel. In addition both the fatigue crack growth rates in the weld metal and heat affected zone (HAZ) are lower than that in the base metal. The fatigue crack growth rate of the HAZ is between that of the weld metal and base metal. It is clear that the change of microstructure and properties in welded joint does not degrade the fatigue performance of the ultra-fine grained steel.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2004年第2期47-49,共3页
Journal of Iron and Steel Research
基金
国家"973"重大基础研究资助项目(G1998061500)
