介绍用超声TOFD(衍射时差)法检测在用电站锅炉低合金钢炉壁管中的腐蚀疲劳裂纹,主蒸汽管和再热蒸汽管等高温管道中的蠕变损伤裂纹,以及节流阀热疲劳裂纹的国外最新动态。用此法能快速、有效地对材料、焊缝和热影响区的表面开口裂纹和内部裂纹进行测深定高,从而对锅炉受压元件及本体进行剩余寿命诊断和安全评价。 Introduced the ultrasonic TOFD (diffraction time difference) method to detect corrosion fatigue cracks in the low-alloy steel furnace wall tubes, creep damage cracks in the main steam pipe and reheat steam pipe and other high temperature pipes, and throttle heat Fatigue crack foreign latest developments. This method can quickly and effectively measure the surface open crack and internal crack of material, weld and heat-affected zone, and then make the residual life diagnosis and safety evaluation of the pressure element and the body of the boiler.