N80管线钢动态充氢后的形貌与力学性能
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摘要
目前,国内对油管用材N80管线钢氢致断裂的研究报道较少。采用NACETM 0 177A标准溶液对N80管线钢作了慢应变速率下的拉伸试验,分析了应变速率分别为10~(-5),10~(-6),10~(-7)s~(-1)时的力学性能,并用扫描电镜(SEM)分析了断口形貌。结果表明:N80管线钢在H_2S气体饱和的NACE TM 0177 A溶液中呈明显的氢致断裂(HIC)敏感性,且随着应变速率的降低,HIC敏感性增加;N80管线钢断裂的主要特征为解理小平面断裂,应变速率降低时,解理平面的面积增大,出现明显的二次裂纹。
Currently,there are few reports on hydrogen-induced fracture(HIC)of tubing material N80 steel.The tensile test on N80 steel was carried under slow strain rate in NACETM 0 177A standard solution,and the mechanical properties under different strain rates(10~(-5),10~(-6),10~(-7)s~(-1))were analyzed.Furthermore,the fracture appearance was characterized by scanning electron microscope(SEM).Results showed that N80 steel presented obvious HIC sensitivity in NACE TM 0177 A standard solution with saturated H_2S.With the decrease of strain rate,the HIC sensitivity increased.Moreover,the main characteristics of the material fracture were cleavage facet.When the strain rate was reduced,the area of the cleavage facet increased,and there were significant secondary cracks.
Currently,there are few reports on hydrogen-induced fracture(HIC)of tubing material N80 steel.The tensile test on N80 steel was carried under slow strain rate in NACETM 0 177A standard solution,and the mechanical properties under different strain rates(10~(-5),10~(-6),10~(-7)s~(-1))were analyzed.Furthermore,the fracture appearance was characterized by scanning electron microscope(SEM).Results showed that N80 steel presented obvious HIC sensitivity in NACE TM 0177 A standard solution with saturated H_2S.With the decrease of strain rate,the HIC sensitivity increased.Moreover,the main characteristics of the material fracture were cleavage facet.When the strain rate was reduced,the area of the cleavage facet increased,and there were significant secondary cracks.
引文
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[2]郭建永,胡军,李庆达,等.国内外油气管道腐蚀与防护的研究进展[J].材料保护,2017,50(6):83-87.
[3]徐海升,李谦定,薛岗林,等.N80油管钢在CO2/H2S水介质中的腐蚀研究[J].材料保护,2009,42(7):59-62.
[4]张清,李全安,文九巴,等.温度对油管钢CO2/H2S腐蚀速率的影响[J].材料保护,2004,37(4):38-39.
[5]李言涛,张玲玲,侯保荣.N80钢在川西某气井常温常压和高温高压下的腐蚀行为[J].材料保护,2011,44(1):64-66.
[6]刘然克,张德平,郝文魁,等. H2S分压对N80油套管钢CO2环境下应力腐蚀开裂的影响[J].四川大学学报(工程科学版),2013,45(6):196-202.
[7] YAN M C,WONG W J. Study on hydrogen absorption of pipeline steel under catholic charging[J].Corroison Science,2008,48(6):432-443.
[8]邓洪达,李春福,曹献龙,等.高含H2S环境中CO2对P110套管钢氢脆腐蚀行为的影响[J].石油与天然气化工,2011,40(3):275-275.
[9] PEI Y C,CHEN W P.Great Diversity in Stability of Perovskite-Type Oxides Studied by Electrochemical Hydrogen Charging[J]. Wuhan University Journal of Natural Sciences,2011,16(3):255-259.
[10]刘江南,王正品,束国刚,等. P91钢的形变强化行为[J].金属热处理,2009,34(1):28-32.