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中文摘要：
采用疲劳试验、显微分析方法和力学性能分析等手段，对焊接热输入为20 kJ/cm的一种X80管线钢焊接接头在不同应力比条件下的疲劳裂纹门槛值进行了研究。研究结果表明，随着应力比的增加，疲劳裂纹扩展速率da/dN增大，疲劳裂纹扩展门槛值呈逐渐降低的趋势。在热输入为20 kJ/cm时，焊缝的组织以针状铁素体为主，含少量多边形铁素体，有很好的韧性。
英文摘要：
The fatigue crack growth threshold on the welded joint of X80 pipeline steel after different stress ratio, with 20 kJ/cm welding heat input, was investigated through fatigue test, microscopic analysis method and mechanical property test. The results showed that, with the stress ratio increasing, and the fatigue crack growth rate da/dN enlarging, the fatigue crack growth threshold gradually presents decrease trend. When the heat input is up to 20 kJ/cm, the microstructure of weld is mainly composed of acicular ferrite, containing a small amount of polygonal ferrite, is with good toughness.
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