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埋地输油管道焊接弯管开裂原因

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某城市埋地输油管道服役约10个月后,在焊接弯管处开裂并发生泄漏现象.采用宏观观察、化学成分分析、扫描电镜分析、金相检验等方法对焊接弯管开裂的原因进行分析.结果表明:焊接弯管选材不当,导致焊接后热影响区形成硬而脆的马氏体,马氏体对氢脆型开裂比较敏感;在服役过程中,管道前侧排水系统泄漏导致下方基土被冲散,弯管下方无支撑,使该区域承受拉应力,焊接弯管在拉应力的作用下,在焊接热影响区发生氢脆延迟性开裂.
Causes of cracking of welded elbow of buried oil pipeline
After about 10 months of service,a buried oil pipeline in a city cracked and leaked at the welded elbow.The causes of cracking of welded elbow were analyzed by macroscopic observation,chemical composition analysis,scanning electron microscope analysis and metallographic examination.The results show that the improper material selection of welded elbow led to the formation of hard and brittle martensite in the heat affected zone after welding.Martensite was sensitive to hydrogen embrittlement cracking.During the service process,the leakage of the drainage system on the front side of the pipeline caused the lower foundation soil to be dispersed,and there was no support under the elbow,resulting in tensile stress in this area.Under the action of tensile stress,hydrogen embrittlement delayed cracking occurred in the welding heat affected zone of the welded elbow.

weldingstainless steeldelayed crackinghydrogen embrittlementtensile stress

金苏柯、罗婵媛、胡家喜、潘安霞

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江苏省特种设备安全监督检验研究院 常州分院,常州 213125

常州大学机械与轨道交通学院,常州 213164

焊接 不锈钢 延迟性开裂 氢脆 拉应力

2024

理化检验-物理分册
上海材料研究所

理化检验-物理分册

影响因子:0.599
ISSN:1001-4012
年,卷(期):2024.60(12)
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