X60和X100钢显微组织与HIC性能的关系
Relationship between Microstructure and HIC Susceptibility of X60 and X100 Pipeline Steels
摘 要
采用NACE标准对X60和X100两种管线钢进行氢致开裂(HIC)试验, 并通过金相显微镜和扫描电镜观察显微组织及夹杂物对两种管线钢氢致开裂性能的影响。结果表明, 与X60钢相比,X100钢对HIC更为敏感, 其裂纹数量远多于X60钢。X60钢在珠光体/铁素体界面上形成细裂纹, 在铁的碳化物和Al-O-Ti夹杂物处形成粗裂纹。X100钢在贝氏体组织上形成细裂纹, 在贝氏体组织和夹杂物的共同作用下形成粗裂纹。由于X100钢晶粒尺寸小, 由夹杂物作为氢陷阱形成的粗裂纹宽度远小于X60钢中的。除了铁的碳化物和钙化的Al-O-Ti夹杂物, X100钢裂纹中出现更加复杂的Mn-Ca-Mg-Si-O-S多元素复合夹杂, 钼元素的富集物对裂纹的扩展影响不显著。
氢致开裂(HIC)
显微组织
夹杂物
X100 pipeline steel
hydrogen induced cracking(HIC)
microstructure
inclusion
Abstract
HIC resistance testing of X60 and X100 pipeline steels was performed according to the NACE standard and analyzed by metallographic microscopy and scanning electron microscopy (SEM). The results show that HIC sensitivity of X100 steel was much higher and the amount of cracks in X100 steel was more than that in X60 steel. Tiny cracks were formed on the interface of pearlite/ferrite in X60 steel, and were formed in bainite phase of X100. Thick cracks were formed owing to iron carbide and Al-O-Ti inclusions in X60 steel, and due to the combined effect of baintie and inclusions in X100 steel. However, the grain size of X100 steel was smaller. As a result, thick cracks in X100 steel were much thinner than those in X60 steel. In addition to iron carbide and calcification of Al-O-Ti inclusions, Mn-Ca-Mg-Si-O-S type composite inclusions appeared in X100 steel and the enrichment of Mo had little influence on cracks.
中图分类号 TG172 DOI 10.11973/fsyfh-201512004
所属栏目 试验研究
基金项目 科技支撑计划课题(2011BAE25B03)
收稿日期 2014/11/24
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备注柳伟(1970-),副教授,博士,从事腐蚀与防护工作,
引用该论文: LU Song-le,LIU Wei,WANG Ting-ting,ZHANG Yi,WANG Xue-min,LU Min-xu. Relationship between Microstructure and HIC Susceptibility of X60 and X100 Pipeline Steels[J]. Corrosion & Protection, 2015, 36(12): 1132
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参考文献
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【2】CHATTORAJ I,TIWARI S B,RAY A K,et al. Investigation on the mechanical degradation of a steel line pipe due to hydrogen ingress during exposure to a simulated sour environment[J]. Corrosion Science,1995,37(6):885-896.
【3】TABKHI F,AZZARO-PANTEL C,PIBOULEAU L,et al. A mathematical framework for modelling and evaluating natural gas pipeline networks under hydrogen injection[J]. International Journal of Hydrogen Energy,2008,33(21):6222-6231.
【4】HARDIE D,CHARLES E A,LOPEZ A H. Hydrogen embrittlement of high strength pipeline steels[J]. Corrosion Science,2006,48(12):4378-4385.
【5】DONG C F,LIU Z Y,LI X G,et al. Effects of hydrogen-charging on the susceptibility of X100 pipeline steel to hydrogen-induced cracking[J]. International Journal of Hydrogen Energy,2009,34(24):9879-9884.
【6】SHEI S A,KIM C D. A microstructural study of the sulfide stress cracking resistance of a Cr-Mo-V-B steel[J]. Corrosion,1985,41(1):12-18.
【7】PARK G T,KOH S U,JUNG H G,et al. Effect of microstructure on the hydrogen trapping efficiency and hydrogen induced cracking of linepipe steel[J]. Corrosion Science,2008,50(7):1865-1871.
【8】阮红志,赵征志,赵爱民,等. 高钢级X100管线钢的组织和析出相[J]. 材料热处理学报,2013,34(1):43-48.
【9】周民,衣海龙,杜林秀,等. X100管线钢中的异常偏析带分析[J]. 东北大学学报(自然科学版),2010,31(3):385-388,410.
【10】JIN T Y,LIU Z Y,CHENG Y F. Effect of non-metallic inclusions on hydrogen-induced cracking of API5L X100 steel[J]. International Journal of Hydrogen Energy,2010,35(15):8014-8021.
【11】AL-MANSOUR M,ALFANTAZI A M,EL-BOUJDAINI M. Sulfide stress cracking resistance of API-X100 high strength low alloy steel[J]. Materials & Design,2009,30(10):4088-4094.
【12】周民,马秋花,杜林秀,等. X100管线钢的组织性能[J]. 东北大学学报(自然科学版),2009,30(7):985-988.
【13】艾芳芳,徐小连,陈义庆,等. 夹杂物对油井管钢氢致开裂腐蚀的影响[J]. 腐蚀与防护,2012,33(5):422-425.
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