针对某石化企业吸附脱硫装置Y型三通发生断裂,通过宏观观察、化学成分分析、扫描电镜分析、硬度检测和力学性能试验,并结合有限元分析,分析了三通断裂的原因。结果表明:三通的断裂形式为脆性断裂,断口存在显著的应力集中,这是造成三通断裂的根本原因;同时,在长期高温含氢环境作用下,三通出现了明显的材质劣化,硬度和断后伸长率偏低,室温下的冲击功仅为5.0J,具有缺口敏感性高和脆性显著等缺点。

In view of the fracture of Y-type tee in adsorption desulfurization unit of a petrochemical enterprise, the fracture causes mode the were analyzed by macroscopic observation, chemical composition analysis, scanning electron microscope analysis, hardness detection and mechanical properties test, combined with finite element analysis. The results showed that the fracture mode was brittle fracture, and there was obvious stress concentration on the fracture surface, which was the fundamental cause of tee fracture. Meanwhile under the long-term high temperature and hydrogen-containing environment, the tee exhibited obvious material degradation, low hardness and elongation after fracture, and the impact energy at room temperature was only 5.0 J, which had the disadvantages of high notch sensitivity and obvious brittleness.