焊管Issue(3)：9-13,5.
一种X80管线钢焊接接头疲劳裂纹扩展门槛值的研究
Research of Fatigue Crack Growth Threshold on the Welded Joint of X80 Pipeline Steel
摘要
Abstract
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.关键词
X80管线钢/疲劳裂纹扩展速率/疲劳裂纹扩展门槛值/应力比Key words
X80 pipeline steel/fatigue crack propagation rate/fatigue crack growth threshold value/stress ratio分类
矿业与冶金引用本文复制引用
王博,张骁勇,马晶,张灵芝,李辉辉..一种X80管线钢焊接接头疲劳裂纹扩展门槛值的研究[J].焊管,2014,(3):9-13,5.基金项目
国家自然科学基金项目（51174165）。 （）
