焊管
銲管
한관
Welded Pipe and Tube
2015年
8期
1-5
,共5页
钢管%腐蚀%H2S%疲劳裂纹扩展
鋼管%腐蝕%H2S%疲勞裂紋擴展
강관%부식%H2S%피로렬문확전
steel pipe%corrosion%hydrogen sulfide%fatigue crack growth
输气管道中的酸性气体在管道局部积液处形成酸性环境会促使裂纹的形成和生长。交变载荷作用下裂纹扩展速度增大，降低了管道的寿命和强度。采用服役中的L360管道加工成三点弯曲试样在饱和H2S水溶液中进行疲劳裂纹扩展试验。试验表明，饱和H2S水溶液中裂纹扩展速度大于空气中裂纹扩展速度，频率越低，裂纹扩展速度越快；扫描电镜观察显示饱和H2S水溶液中裂纹扩展断面以脆性断裂为主，穿晶断裂和沿晶断裂为主要破坏形式，频率越低，穿晶断裂所占面积越大。
輸氣管道中的痠性氣體在管道跼部積液處形成痠性環境會促使裂紋的形成和生長。交變載荷作用下裂紋擴展速度增大，降低瞭管道的壽命和彊度。採用服役中的L360管道加工成三點彎麯試樣在飽和H2S水溶液中進行疲勞裂紋擴展試驗。試驗錶明，飽和H2S水溶液中裂紋擴展速度大于空氣中裂紋擴展速度，頻率越低，裂紋擴展速度越快；掃描電鏡觀察顯示飽和H2S水溶液中裂紋擴展斷麵以脆性斷裂為主，穿晶斷裂和沿晶斷裂為主要破壞形式，頻率越低，穿晶斷裂所佔麵積越大。
수기관도중적산성기체재관도국부적액처형성산성배경회촉사렬문적형성화생장。교변재하작용하렬문확전속도증대，강저료관도적수명화강도。채용복역중적L360관도가공성삼점만곡시양재포화H2S수용액중진행피로렬문확전시험。시험표명，포화H2S수용액중렬문확전속도대우공기중렬문확전속도，빈솔월저，렬문확전속도월쾌；소묘전경관찰현시포화H2S수용액중렬문확전단면이취성단렬위주，천정단렬화연정단렬위주요파배형식，빈솔월저，천정단렬소점면적월대。
Crack would occur and grow in local hydrops area when acid environment was formed because of acid gas in gas pipeline. Crack growth rate would increase in fluctuating load which decrease the service time and strength of pipeline. Fatigue crack growth test was conducted in saturated hydrogen sulphide solution with SENB specimens which was machined from L360 pipeline. Test results showed that fatigue crack growth rate is faster in saturated hydrogen sulphide solution than that in air. Fatigue crack growth rate increases with the decrement of frequency. Brittle fracture is the principal failure model in crack propagation surface,transgranular fracture and intergranular fracture are major fracture mode,the portion of transgranular fracture area in fracture surface would increase as frequency decrease.
