压力容器腐蚀损伤的超声相控阵检测分析

Detection and Analysis of Corrosion Damage of Pressure Vessels by Ultrasonic Phased Array Technology

压力容器在湿硫化氢环境下,可能会产生氢鼓泡、氢致开裂等腐蚀损伤,形成安全隐患。采用人工试板模拟两种典型的腐蚀缺陷,对超声相控阵技术的检测能力进行试验。结果表明:该技术能够较好地满足腐蚀损伤的检测需求;对某压力容器的壁厚异常部位进行诊断检测,发现大量氢致开裂,结合金相分析结果,初步认为容器材料的带状组织导致力学性能降低,增加氢致裂纹的敏感性。

Hydrogen bubbling and hydrogen-induced cracking may occur to the pressure vessels under wet hydrogen sulfide environment to form a potential safety hazard.Firstly,having two typical corrosion defects simulated on the artificial test plates to test ability of ultrasonic phased array technology.The results showed that this technology can meet the requirements of corrosion damage detection.Through applying ultrasonic phased array technology to detect a pressure vessel with abnormal wall thickness,a large number of hydrogen-induced cracks were found.Through combining with the metallographic analysis,it was preliminarily considered that the banded structure of the container material can lead to the decrease of mechanical properties and the increase of sensitivity of hydrogen-induced cracks.