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| MICROSTRUCTURE EFFECTS ON CORROSION AND CRACKING BEHAVIOR OF X52 PIPELINE STEEL IN H2S ENVIRONMENT |
| YAO Xuejun, WANG Jianqiu, ZUO Jinghui, HAN En-Hou, KE Wei |
| State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract Three different microstructures of X52 pipeline steel were obtained through different heat treatments. SEM results showed that the three different microstructures were ferrite/band pearlite, martensite/bainite and acicular ferrite/tempered martensite. The effects of microstructures on corrosion and cracking behavior of X52 steel in the H2S-containing solution were studied through potentiodynamic polarization measurements, linear polarization resistance measurements, hydrogen induced cracking (HIC) tests and sulfide stress cracking (SSC) tests. The results showed that martensite/bainite had the highest corrosion rate as well as highest susceptibility to suffer HIC and SSC of all the three microstructures due to its high density tangled dislocation and its high brittlement. Both of ferrite/band pearlite and acicular ferrite/tempered martensite had lower corrosion rate and better HIC and SSC resistance compared to martensite/bainite. However, the acicular ferrite/tempered martensite microstructure had higher resistance of HIC and SSC than ferrite/band pearlite due to the elimination of band structures, grain refinement and the precipitation of fine carbides in the matrix.
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Received: 22 December 2010
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Corresponding Authors:
Jianqiu WANG
E-mail: wangjianqiu@imr.ac.cn
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