【作者】 林美；

【导师】 吴俊飞；

【作者基本信息】 青岛科技大学 ， 化工过程机械， 2010， 硕士

【摘要】 本文针对已有德齐龙管道事故碎片,对石化工业中常出现的氢损伤进行研究。通过对氢损伤机理及损伤形式的研究,对现有氢损伤进行了重新划分。对已有的管道事故碎片进行分析,发现管道破坏的根本原因为氢损伤,并通过有限元法进一步确认该破坏致因。采用超声、磁粉、渗透等多种常规无损检测方法对管道碎片进行检测,对比检测结果,评比出更适于氢损伤检测的检测方法。在此基础上引进磁记忆检测法对氢损伤进行检测,通过分析具体检测结果,发现金属磁记忆检测法是对氢损伤进行检测的有效方法。该方法能够发现早期氢损伤,能够反映氢损伤严重程度。但该方法也有其不足,不能确定氢损伤在被检件厚度方向上的具体位置、大小及性质,而超声能够弥补其在该方面的不足。因此,对比上述所有检测方法,本文最终得出针对氢损伤进行检测的有效方法为磁记忆和超声两种方法的共同使用。其具体方法为:先通过磁记忆有效确定出缺陷在被检件表面上的大致位置;然后利用超声进行复检,进一步确定氢损伤缺陷在被检件厚度方向上得的大小及性质。该方法能够有效发现管道中的氢损伤。并在此基础上,结合渗透法、磁粉法对一般缺陷进行等级划分的方法对氢损伤进行损伤程度的等级划分,初步得出氢损伤的评定法。更多还原

【Abstract】 Based on the pipe fragments happened in Deqilong accident, this paper research the hydrogen damage, which is usually happened in petrochemical industry. Through analysis the mechanism and damage forms of hydrogen damage, the existing hydrogen damage are re-classified. Through analysis the existing pipeline accident debris, found the root cause of pipeline damage is hydrogen damage, and further confirmed by the finite element method.Using ultrasonic, magnetic particle, penetration and other conventional non-destructive testing methods for the detection of hydrogen damage pipe fragments, compare the test results, and assess these detection methods for detection of hydrogen damage. Based on the results above, introduction of magnetic memory testing method for hydrogen damage detection. And through specific test results found that metal magnetic memory testing method is an effective detection of hydrogen damage detection. This method can detect early hydrogen damage, and can also reflect the hydrogen damage severity. However, this method also has its shortcomings, it can not determine the position of hydrogen damage in the thickness direction and the nature, but the ultrasonic testing method be able to compensate this deficiencies in that regard.Therefore, this paper introduce the combination of ultrasonic testing and Magnetic memory testing method to test hydrogen damage, and it is a effective method. The specific of this method is that, first use the magnetic memory effectively to identify defects location on the piece surface, and then conduct a review using ultrasonic testing to further determine the defects of hydrogen damage location in the thickness direction, and also the size and nature. This method can effectively discover the hydrogen pipeline damage. And at last, combinate the penetration and magnetic methods for grading the general flaw, get the hydrogen damage grading, and initially get the assessment method of hydrogen damage.更多还原